JP2018146295A - Control device, measurement system, and program - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a control device capable of suppressing a long time until a count of radiation emitted from a nuclide to be detected reaches a target count. A control device calculates a count of radiation emitted from a nuclear species to be detected by using a spectrum of the radiation calculated by a pulse height analyzer based on a signal indicating the radiation detected by the detection unit. A calculation unit, a determination unit that determines whether or not the count calculated by the count calculation unit is equal to or higher than the target count, and a measurement control unit that terminates the spectrum calculation by the wave height analyzer based on the determination result of the determination unit. , Equipped with. [Selection diagram] Fig. 1

Description

  The present invention relates to a control device, a measurement system, and a program.

  Research and development of a technique relating to calculation of a count in which radiation detected from a specific nuclide desired by a user among radiation emitted from a sample is detected by a detector has been performed.

  In this regard, for example, as shown in Patent Document 1, the radiation emitted from the sample is detected by a radiation detector, the energy spectrum of the radiation detected by the radiation detector is automatically analyzed, and the analyzed energy spectrum is converted into the analyzed energy spectrum. There is known a radioactivity measuring apparatus that calculates radioactivity of a detection target nuclide based on the radioactivity.

Japanese Patent Laying-Open No. 2015-99067

  Here, such a conventional radioactivity measuring apparatus detects the radiation emitted from the sample by the radiation detector within the measurement time calculated by the preliminary measurement. The measurement time is a time estimated that the number of radiation emitted from the detection target nuclide out of the radiation emitted from the sample is detected by the radiation detector is equal to or greater than a target count determined according to a predetermined application. is there. For this reason, when the measurement time elapses, the radioactivity measurement apparatus ends detection of radiation emitted from the sample by the radiation detector. However, when the radiation emitted from the detection target nuclide is detected by the radiation detector within the measurement time, it changes due to the influence of statistical fluctuations every time the radiation is detected, so the target count is not reached. There is. In such a case, the radioactivity measurement apparatus must re-detect the radiation emitted from the sample by the radiation detector, and as a result, the time required for the count to reach the target count becomes longer. There was a case.

  Therefore, the present invention has been made in view of the above-described problems of the prior art, and a control device capable of suppressing an increase in the time until the count of radiation emitted from the detection target nuclide reaches the target count. , A measurement system, and a program are provided.

In order to solve the above problems and achieve the object, the present invention employs the following aspects.
(1) The control device according to one aspect of the present invention uses the spectrum of the radiation calculated by the wave height analyzer based on the signal indicating the radiation detected by the detection unit, and the radiation emitted from the detection target nuclide. By the wave height analyzer based on the determination result of the determination unit, a determination unit that determines whether the count calculated by the count calculation unit is equal to or greater than a target count, A measurement control unit for terminating the calculation of the spectrum.

(2) In the control device according to (1), the count calculation unit calculates the count at a plurality of timings within a measurement period, and the measurement control unit continuously determines that the count is equal to or greater than the target count. When the determination unit determines a predetermined number of times, the spectrum calculation by the wave height analyzer is terminated.

(3) In the control device according to (2), when the measurement control unit further passes a measurement time based on a time estimated to be equal to or greater than the target count from the start time of the measurement period, The calculation of the spectrum by the wave height analyzer is terminated.

(4) In the control device according to (3), the measurement control unit terminates the calculation of the spectrum by the wave height analyzer when the measurement time has elapsed from the start time, and the counting Is determined to be less than the target count, the calculation of the spectrum by the wave height analyzer is resumed.

(5) In the control device according to the above (3) or (4), the measurement time is longer than the time.

(6) In the control device according to any one of (1) to (5), the count calculation unit receives a plurality of different detection target nuclides in advance and receives the plurality of detection target nuclides. For each of the plurality of detection target nuclides, the determination unit calculates the number of radiation radiated from the detection target nuclides according to the target radiation. It is determined whether or not the number is greater than or equal to the count, the measurement control unit, for all the radiation of each of the plurality of detection target nuclides, the count of radiation emitted from the detection target nuclides, the target according to the radiation When the determination unit determines that the number is greater than or equal to the count, calculation of the spectrum by the wave height analyzer is terminated.

(7) The measurement system which concerns on 1 aspect of this invention is provided with the control apparatus which concerns on any one among said (1) to (6), and the said detection part.

(8) The measurement system which concerns on 1 aspect of this invention is provided with the control apparatus which concerns on any one among said (1) to (6), the said detection part, and the said wave height analyzer.

(9) In the measurement system according to one aspect of the present invention, the measurement system according to (7) or (8) further includes a shield that suppresses radiation from entering the detection unit from the outside.

(10) A program according to an aspect of the present invention is emitted from a detection target nuclide using a spectrum of the radiation calculated by a pulse height analyzer based on a signal indicating radiation detected by a detection unit. A count calculation step for calculating a count of radiation, a determination step for determining whether the count calculated in the count calculation step is equal to or greater than a target count, and the pulse height analysis based on a determination result in the determination step A measurement control step of terminating calculation of the spectrum by the apparatus.

  The control device according to one aspect described in (1) is radiated from the detection target nuclide using the spectrum of the radiation calculated by the pulse height analyzer based on the signal indicating the radiation detected by the detection unit. The radiation count is calculated, it is determined whether the calculated count is equal to or greater than the target count, and the spectrum calculation by the pulse height analyzer is terminated based on the determination result. Thereby, the said control apparatus can suppress that time until the count of the radiation radiated | emitted from a detection target nuclide reaches | attains a target count becomes long.

  The control device according to one aspect of the above (2) calculates the count of radiation emitted from the detection target nuclide at a plurality of timings within the measurement period, and continuously determines that the count is equal to or greater than the target count. When the number of times is determined, the spectrum calculation by the wave height analyzer is terminated. Thereby, the said control apparatus can suppress more reliably that the time until the count of the radiation radiated | emitted from a detection object nuclide reaches | attains a target count becomes long.

  The control device according to one aspect of the above (3), when the measurement time based on the time estimated from the start time of the measurement period is reached that the count of radiation emitted from the detection target nuclide is equal to or greater than the target count Then, the calculation of the spectrum by the wave height analyzer is terminated. Thereby, the said control apparatus can complete | finish the calculation of the spectrum by a wave height analyzer, even if it is a case where the count of the radiation radiated | emitted from a detection target nuclide does not become more than a target count for some reason.

  The control device according to one aspect of the above (4) emits from the detection target nuclide when the calculation of the spectrum by the wave height analyzer is terminated after the measurement time has elapsed from the start time of the measurement period. When it is determined that the radiation count is less than the target count, spectrum calculation by the wave height analyzer is resumed. Thereby, the said control apparatus can reduce the effort which is required for the remeasurement of the radiation radiated | emitted from a sample.

  The control device according to one aspect described in the above (5) is a measurement time based on a time estimated from the start time of the measurement period that the count of radiation emitted from the detection target nuclide is equal to or greater than the target count. When the measurement time longer than the time has elapsed, the spectrum calculation by the wave height analyzer is terminated. Thereby, the said control apparatus can complete | finish the calculation of the spectrum by a wave height analyzer, even if it is a case where the count of the radiation radiated | emitted from a detection target nuclide does not become more than a target count for some reason.

  The control device according to one aspect of the above (6) receives a plurality of different detection target nuclides in advance, calculates a count for each radiation emitted from each of the received plurality of detection target nuclides, and detects a plurality of detections For each target nuclide, it is determined whether or not the number of radiation emitted from the detection target nuclide is equal to or greater than the target count according to the radiation, and all the radiation of each of the plurality of detection target nuclides is emitted from the detection target nuclide. When it is determined that the counted radiation is equal to or greater than the target count corresponding to the radiation, the calculation of the spectrum by the wave height analyzer is terminated. Thereby, the said control apparatus can suppress that time until the count of a radiation reaches | attains a target count about all the radiation radiated | emitted from each of a some detection target nuclide becomes long.

  The measurement system according to one aspect of the above (7) includes a detection target nuclide using a spectrum of the radiation calculated by the pulse height analyzer based on a signal indicating the radiation detected by the detection unit included in the measurement system. Calculates the number of radiation emitted from the sensor at multiple timings within the measurement period, determines whether the calculated count is greater than or equal to the target count, and ends the spectrum calculation by the pulse height analyzer based on the determination result Let Thereby, the said measurement system can suppress that time until the count of the radiation radiated | emitted from a detection target nuclide reaches | attains a target count becomes long.

  The measurement system according to one aspect of the above (8) uses the spectrum of the radiation calculated by the pulse height analyzer included in the measurement system based on the signal indicating the radiation detected by the detection unit included in the measurement system. And calculating the count of radiation emitted from the detection target nuclide at a plurality of timings within the measurement period, determining whether the calculated count is equal to or greater than the target count, and based on the determination result, the wave height analyzer The calculation of the spectrum is terminated. Thereby, the said measurement system can suppress that time until the count of the radiation radiated | emitted from a detection target nuclide reaches | attains a target count becomes long.

  The measurement system according to one aspect described in (9) suppresses the incidence of radiation from the outside to the detection unit. Thereby, the said measurement system can make small the error by the background of the count of the radiation radiated | emitted from a detection target nuclide.

  The program according to one aspect described in the above (10) is radiated from a detection target nuclide using a spectrum of the radiation calculated by the pulse height analyzer based on a signal indicating the radiation detected by the detection unit. The calculated count of the radiation is calculated, and it is determined whether or not the calculated count is equal to or greater than the target count, and the spectrum calculation by the pulse height analyzer is terminated based on the determination result. Thereby, the said program can suppress that time until the count of the radiation radiated | emitted from a detection target nuclide reaches | attains a target count becomes long.

It is a figure showing an example of composition of measuring system 1 concerning this embodiment. It is a figure which shows an example of the operation screen in which the control apparatus 4 receives operation from a user among the screens which the control apparatus 4 displays on the display part 45. FIG. It is a figure which shows an example of a target count setting screen. It is a figure which shows an example of a measurement condition setting screen. It is a figure which shows an example of the flow of a process in which the control apparatus 4 calculates the count of the radiation radiated | emitted from a detection target nuclide. It is a figure which shows an example of the table | surface displayed on the display part 45 in step S200. It is a figure which shows an example of the flow of a process in which the control apparatus 4 performs remeasurement of the various radiation radiated | emitted from a sample.

<Embodiment>
Hereinafter, a measurement system 1 according to an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a diagram illustrating an example of a configuration of a measurement system 1 according to the present embodiment. The measurement system 1 includes a detection unit 2, a wave height analysis device 3, and a control device 4. The measurement system 1 may be configured to include other devices in addition to these. In the measurement system 1, the detection unit 2, the wave height analyzer 3, and a part or all of the controller 4 may be configured integrally. In the present embodiment, the process of converting an analog signal into a digital signal may be performed by some or all of the detection unit 2, the wave height analysis device 3, and the control device 4, or may be performed by a known method. Since it may be performed by the method developed from now on, description is abbreviate | omitted.

<Outline of measurement system>
First, an outline of the measurement system 1 will be described.
The measurement system 1 measures various types of radiation emitted from the sample. Specifically, the measurement system 1 detects the various types of radiation and calculates spectra of the various types of detected radiation. Moreover, the measurement system 1 performs an analysis based on the calculated spectrum. Specifically, the measurement system 1 calculates (measures) the count of radiation emitted from the detection target nuclide based on the spectrum.

  Here, the aforementioned sample is an object including one or more radionuclides. Further, in the present embodiment, various types of radiation emitted from the sample are radiation emitted from each of one or more radionuclides contained in the sample, and the types of radiation (for example, alpha rays, beta rays, It is distinguished by the combination of gamma rays and the energy of radiation. The detection target nuclide is a nuclide that the measurement system 1 receives in advance from the user, and is a nuclide that emits radiation that is a target for which the measurement system 1 calculates a count. The count of the radiation radiated from the detection target nuclide is the number of times that the radiation is detected by the detection unit 2.

  More specifically, the measurement system 1 starts detecting various types of radiation emitted from the sample based on an operation received from the user. And the measurement system 1 detects the said various radiation by the detection part 2 in the measurement period between the start time which is the time which received the said operation, and until the predetermined measurement time passes. Here, the start time may be a time before the time when the detection unit 2 starts detecting radiation, or may be substantially the same time. Hereinafter, the difference between the start time and the time will be referred to as a standby time. The measurement system 1 receives a standby time from the user, and starts detection of radiation by the detection unit 2 based on the received standby time.

  In addition, the detection unit 2 outputs a signal indicating each of various types of radiation detected by the detection unit 2 to the wave height analyzer 3. The wave height analyzer 3 acquires the signal from the detection unit 2. Moreover, the wave height analyzer 3 calculates the spectrum of the radiation detected by the detection unit 2 at a plurality of timings within the measurement period, using the plurality of acquired signals. The spectrum is the energy spectrum of the radiation. Hereinafter, a case will be described in which the plurality of timings are timings that equally divide the time between the time when the standby time has elapsed from the start time of the measurement period and the end time of the measurement period into a predetermined number. Therefore, hereinafter, for convenience of explanation, a time between a certain timing among the plurality of timings and a timing next to the timing will be referred to as a monitor interval. The monitoring interval is, for example, 60 seconds, but may be shorter than 60 seconds or longer than 60 seconds. Note that the plurality of timings may instead be a plurality of random timings within the time between the time when the standby time has elapsed from the start time of the measurement period and the end time of the measurement period. There may be a plurality of other timings based on time. Moreover, the wave height analyzer 3 may be configured to calculate the spectrum of the radiation detected by the detection unit 2 at a certain timing within the measurement period, using a plurality of the acquired signals. The pulse height analyzer 3 outputs information indicating the calculated spectrum to the controller 4. The control device 4 acquires the information from the wave height analyzer 3. Based on the acquired information, the control device 4 calculates each of the counts of radiation emitted from each of the one or more detection target nuclides received from the user. For each of the one or more detection target nuclides, the control device 4 performs processing based on the calculated count of radiation emitted from the detection target nuclides. This process is, for example, a process for calculating the radioactivity of the detection target nuclide. The process may be another process based on the count instead of the process of calculating the radioactivity of the detection target nuclide.

  Here, in a measurement system X (for example, a conventional measurement system) different from the measurement system 1, the measurement time is calculated in advance by preliminary measurement. For this reason, in the measurement system X, when the measurement time has elapsed from the time when the operation for starting the detection of radiation has been received from the user, various types of radiation radiated from the sample (that is, spectrum collection described later) are performed. finish. Specifically, the measurement system X ends the detection of the radiation by the detection unit 2 and the calculation of the spectrum by the wave height analyzer 3, and ends the detection of the various types of radiation. However, when the radiation emitted from the detection target nuclide is detected by the radiation detector within the measurement time, it changes due to the influence of statistical fluctuations every time the radiation is detected, so the target count is not reached. There is. As a result, the measurement system X may have to remeasure various types of radiation emitted from the sample.

  In order to solve this problem, the measurement system 1 uses the spectrum of the radiation calculated by the pulse height analyzer 3 based on the signal indicating the radiation detected by the detection unit 2 to detect the radiation radiated from the detection target nuclide. Calculate the count. The measurement system 1 determines whether the calculated count is greater than or equal to the target count. Then, the measurement system 1 ends the measurement of the radiation emitted from the sample based on the determination result. Thereby, the measurement system 1 can suppress that time until the count of the radiation radiated | emitted from a detection target nuclide reaches | attains a target count becomes long. Below, the process which the measurement system 1 calculates the count of the radiation radiated | emitted from a detection target nuclide is demonstrated in detail. Moreover, below, the measurement system 1 demonstrates the case where the calculation of the spectrum by the wave height analyzer 3 is complete | finished based on the said determination result, and the said measurement is complete | finished as an example. The measurement system 1 may have a configuration in which the measurement system 1 ends detection of radiation by the detection unit 2 based on the determination result, and ends the measurement. The measurement system 1 is based on the determination result. Thus, the configuration may be such that both the detection and the calculation are terminated and the measurement is terminated.

<Configuration of measurement system>
Hereinafter, the configuration of the measurement system 1 will be described with reference to FIG.

  The detection unit 2 is, for example, a semiconductor detector such as germanium, and detects at least gamma rays and X-rays among various types of radiation emitted from the sample. The detection unit 2 may be a detector that can detect other radiation in addition to gamma rays and X-rays, and can detect other radiation in place of either or both of gamma rays and X-rays. It may be a vessel. That is, the detection unit 2 may be another radiation detector such as a GM (Geiger-Muller) counter, a scintillation counter, or the like, instead of the semiconductor detector. The detection unit 2 may be surrounded by a shield that shields the radiation (external radiation) other than the radiation radiated from the sample from entering the detector 2, and is not surrounded by the shield. Also good. The shield is a shield made of lead, for example. Note that the shield may be formed of another substance instead of lead.

  The wave height analyzer 3 is, for example, a multi-channel analyzer. The pulse height analyzer 3 acquires a signal indicating the radiation detected by the detection unit 2 from the detection unit 2. The wave height analyzer 3 calculates a wave height distribution of the acquired signal, that is, a count value for each of a plurality of channels set according to the wave height value. For example, when a signal having a peak value corresponding to the energy of the radiation emitted from the sample is acquired from the detection unit 2, the pulse height analyzer 3 generates the above-described spectrum as the pulse height distribution of the acquired signal. The process in which the wave height analyzer 3 acquires the signal from the detection unit 2 and generates the spectrum based on the acquired signal may be referred to as spectrum collection by the wave height analyzer 3. That is, the wave height analyzer 3 collects a spectrum. Note that the bin of the spectrum corresponds to each of the plurality of channels. The wave height analyzer 3 may be another analyzer that calculates a count based on a signal indicating radiation detected by the detector 2 such as a single channel analyzer.

  The control device 4 is, for example, a workstation, a desktop PC (Personal Computer), a notebook PC, a tablet PC, a multi-function mobile phone (smart phone), a PDA (Personal Digital Assistant), or the like. The control device 4 controls the entire measurement system 1. The control device 4 includes a CPU (not shown), a storage unit 42, an input receiving unit 43, a communication unit 44, a display unit 45, and a control unit 46.

  A CPU (not shown) included in the control device 4 executes various programs stored in the storage unit 42.

  The storage unit 42 includes, for example, an HDD (Hard Disk Drive), an SSD (Solid State Drive), an EEPROM (Electrically Erasable Programmable Read-Only Memory), a ROM (Read-Only Memory), a RAM (Random Access Memory), and the like. The storage unit 42 may be an external storage device connected via a digital input / output port such as a USB instead of the one built in the control device 4. The storage unit 42 stores various information processed by the control device 4, various images, various programs, and the like.

  The input receiving unit 43 is, for example, a keyboard, mouse, touch pad, or other input device. The input receiving unit 43 may be a touch panel configured integrally with the display unit 45. Further, in this example, the input receiving unit 43 is configured integrally with the control device 4, but may be configured separately from the control device 4 instead. In this case, the input reception unit 43 is communicably connected to the control device 4 by wire or wireless.

  The communication unit 44 includes, for example, a digital input / output port such as USB, an Ethernet (registered trademark) port, and the like.

  The display unit 45 is, for example, a liquid crystal display panel or an organic EL (ElectroLuminescence) display panel. In this example, the display unit 45 is configured integrally with the control device 4, but may instead be configured separately from the control device 4. In this case, the display unit 45 is communicably connected to the control device 4 by wire or wireless.

  The control unit 46 includes a display control unit 461, a setting reception unit 462, a spectrum acquisition unit 463, a count calculation unit 465, a determination unit 467, and a measurement control unit 469. These functional units included in the control unit 46 are realized, for example, when the above-described CPU executes various programs stored in the storage unit 42. Further, some or all of the functional units may be hardware functional units such as LSI (Large Scale Integration) and ASIC (Application Specific Integrated Circuit).

  Based on the operation received from the user, the display control unit 461 generates various screens including an operation screen in which the control device 4 receives an operation from the user. The display control unit 461 displays the generated various screens on the display unit 45.

  The setting accepting unit 462 accepts various settings set in each functional unit included in the control unit 46 from the user via at least some of the various screens displayed on the display unit 45 by the display control unit 461. .

  The spectrum acquisition unit 463 acquires information indicating the spectrum calculated by the wave height analyzer 3 from the wave height analyzer 3. The spectrum acquisition unit 463 is information stored in advance by the user and based on correspondence information indicating the correspondence between each of a plurality of channels of the pulse height analyzer 3 and energy, and a plurality of spectra indicated by the acquired information. Bins indicating each of the plurality of channels are converted into bins indicating energy. In the following, for convenience of explanation, description of such bin conversion processing by the spectrum acquisition unit 463 is omitted.

  The count calculation unit 465 calculates the count of radiation emitted from the detection target nuclide using the spectrum indicated by the information acquired by the spectrum acquisition unit 463.

  The determination unit 467 determines whether or not the count calculated by the count calculation unit 465 is greater than or equal to the target count.

  The measurement control unit 469 terminates measurement of various types of radiation emitted from the sample based on the determination result of the determination unit 467. In this example, the measurement control unit 469 ends the spectrum calculation by the pulse height analyzer 3 based on the determination result.

<Specific examples of various screens displayed on the display unit by the control device>
Hereinafter, specific examples of various screens displayed on the display unit 45 by the control device 4 will be described with reference to FIGS. Note that the configurations of the various screens described below are merely examples, and may be configured with arbitrary changes. The control device 4 may be configured to display one or more screens different from the various screens described below on the display unit 45.

  FIG. 2 is a diagram illustrating an example of an operation screen on which the control device 4 receives an operation from the user among the screens displayed on the display unit 45 by the control device 4. A screen 31 illustrated in FIG. 2 is an example of an operation screen. In this example, the screen 31 includes a switching tab 32 including a button 32a and a button 32b. The button 32a is a button for displaying a target count setting screen which is a screen for setting a target count instead of the screen 31. The button 32b is a button for displaying a measurement condition setting screen for setting measurement conditions, which are various conditions related to the measurement of radiation by the measurement system 1, instead of the screen 31. The screen 31 may be configured to include other GUIs in addition to these GUIs (Graphical User Interfaces), or may be configured to include other GUIs instead of these GUIs. Good.

  When receiving an operation (for example, click, tap, etc.) for selecting the button 32a from the user, the display control unit 461 displays a target count setting screen instead of the screen 31 (switches from the screen 31 to the screen). Further, when receiving an operation (for example, click, tap, etc.) for selecting the button 32b from the user, the display control unit 461 displays a measurement condition setting screen instead of the screen 31 (switches from the screen 31 to the screen). ).

  FIG. 3 is a diagram illustrating an example of the target count setting screen. That is, the screen 33 shown in FIG. 3 is an example of a target count setting screen. In this example, the screen 33 includes a switching tab 34 including a button 34 a and a button 34 b, a screen 36, and a screen 37. Note that the screen 33 may be configured to include other GUIs in addition to these GUIs, or may be configured to include other GUIs instead of these GUIs.

  The button 34a is a button for receiving (registering) a detection target nuclide. When the display control unit 461 receives an operation (for example, click, tap, etc.) for selecting the button 34 a from the user, for example, the display control unit 461 reads out information indicating a list of nuclides stored in the storage unit 42 from the storage unit 42 in advance. The nuclide is a radionuclide. Then, the display control unit 461 displays a screen for displaying a list of nuclides on the screen 33 based on the read information. On the screen, the user can select one or more desired nuclides as one or more detection target nuclides from the list displayed on the screen. When the user selects one or more nuclides on the screen, the setting reception unit 462 receives each of the one or more nuclides selected by the user as a detection target nuclide. In this case, the display control unit 461 deletes the screen and displays on the screen 36 detection target radiation information that is information indicating radiation emitted by one or more detection target nuclides received by the setting reception unit 462. Let The detection target radiation information indicating the radiation emitted by a certain detection target nuclide is information including detection target nuclide information indicating the detection target nuclide and energy information indicating the energy of the radiation. The detection target nuclide information is, for example, a symbol, a numerical value, a character string, or the like indicating the detection target nuclide. The energy information is a numerical value, a symbol, a character string, or the like indicating the energy. When some of the one or more nuclides selected by the user are nuclides that emit a plurality of radiations having different energies, such as cobalt 57 and cobalt 60, the display control unit 461 includes: As shown in FIG. 3, for each nuclide, detection target radiation information indicating each of the plurality of radiations emitted by the nuclide is displayed on the screen 36. Further, the detection target radiation information may be information including channel information indicating a channel in which the radiation is detected instead of the energy information. Further, the detection target radiation information may be information including a partial combination of the detection target nuclide information, the energy information, and the channel information.

  The button 34b is a button that removes (cancels) some or all of one or more nuclides received as detection target nuclides by the setting reception unit 462 from the detection target nuclides. When the display control unit 461 receives an operation (for example, click, tap, etc.) for selecting the button 34b from the user, the display control unit 461 displays, for example, a list of one or more nuclides received as detection target nuclides by the setting reception unit 462. The screen is displayed over the screen 33. On the screen, the user can select one or more nuclides from the list displayed on the screen. When the user selects one or more nuclides on the screen, the setting reception unit 462 removes the one or more nuclides selected by the user from the detection target nuclides. In this case, the display control unit 461 deletes the screen, and deletes the detection target radiation information indicating the radiation emitted by the nuclide removed from the detection target nuclide by the setting reception unit 462 from the screen 36.

  As described above, the screen 36 is a screen that receives (sets) a target count for each radiation indicated by each of the one or more detection target radiation information displayed on the screen 36. As shown in FIG. 3, the screen 36 displays input fields corresponding to each of the one or more detection target radiation information displayed on the screen 36. Each of the input fields displayed on the screen 36 is a field for inputting a target count of radiation indicated by detection target radiation information corresponding to each input field. That is, the user can input the target count of radiation indicated by the detection target radiation information in an input field corresponding to certain detection target radiation information. When a value in a certain input field displayed on the screen 36 is input, the setting reception unit 462 displays the target value of radiation indicated by the detection target radiation information corresponding to the input field as the value input in the input field. Accept as a count.

  FIG. 3 shows an example of the screen 36 when each of the cobalt 57 and the cobalt 60 is selected as a detection target nuclide. Here, the cobalt 57 emits 122.05 keV radiation and 136.47 keV radiation. Further, the cobalt 60 emits 1173.21 keV radiation and 13332.47 keV radiation. Therefore, on the screen 36, detection target radiation information “Co-57 (122.05 keV)”, detection target radiation information “Co-57 (136.47 keV)”, and “Co-60 (1173.21 keV)” are displayed. ) ”And four pieces of detection target radiation information of“ Co-60 (13332.47 keV) ”. Here, “Co-57” is detection target nuclide information indicating cobalt 57. “Co-60” is detection target nuclide information indicating cobalt 60. Further, “(122.05 keV)”, “(136.47 keV)”, “(1173.21 keV)”, and “(133.47 keV)” are energy information.

  In the screen 36 shown in FIG. 3, a value “5.000E + 00” is input from the user in the input field corresponding to the detection target radiation information “Co-57 (122.05 keV)”. That is, when the user sets the target count for the count of 122.05 keV radiation emitted from cobalt 57 to 5 counts, the user inputs a value of “5.000E + 00” in the input field. When a value is input in the input field, the setting reception unit 462 receives the value as a target radiation count indicated by the detection target radiation information corresponding to the input field. That is, in the example illustrated in FIG. 3, the setting reception unit 462 receives 5 counts as the target count of the 122.05 keV radiation emitted from the cobalt 57.

  Further, on the screen 36, the value “5.000E + 01” is input from the user in the input field corresponding to the detection target radiation information “Co-57 (136.47 keV)”. That is, when setting the target count for the count of 136.47 keV radiation emitted from cobalt 57 to 50 counts, the user inputs a value of “5.000E + 01” in the input field. When a value is input in the input field, the setting reception unit 462 receives the value as a target radiation count indicated by the detection target radiation information corresponding to the input field. That is, in the example illustrated in FIG. 3, the setting reception unit 462 receives 50 counts as the target count of 136.47 keV radiation radiated from the cobalt 57.

  On the screen 36, the value “1.000E + 01” is input from the user in the input field corresponding to the detection target radiation information “Co-60 (1173.21 keV)”. That is, when setting the target count for the count of 1173.21 keV radiation radiated from cobalt 60 to 10 counts, the user inputs a value of “1.000E + 01” in the input field. When a value is input in the input field, the setting reception unit 462 receives the value as a target radiation count indicated by the detection target radiation information corresponding to the input field. That is, in the example illustrated in FIG. 3, the setting reception unit 462 receives 10 counts as a target count of 1173.21 keV radiation radiated from the cobalt 60.

  In addition, on the screen 36, a value “5.000E + 00” is input by the user in the input field corresponding to the detection target radiation information “Co-60 (13332.47 keV)”. That is, the user inputs a value of “5.000E + 00” in the input field when setting the target count for the count of 13332.47 keV radiation emitted from cobalt 60 to 5 counts. When a value is input in the input field, the setting reception unit 462 receives the value as a target radiation count indicated by the detection target radiation information corresponding to the input field. That is, in the example illustrated in FIG. 3, the setting reception unit 462 receives 5 counts as the target count of the radiation of 13232.47 keV emitted from the cobalt 60.

  The screen 37 is a screen for receiving, for example, the above-described standby time, the above-described monitoring interval, and the continuous determination number target value (indicated as the number of times of arrival in FIG. 3). The screen 37 includes a standby time input field that is an input field for inputting a standby time, a monitor interval input field that is an input field for inputting a monitor interval, and a continuous determination frequency target value input field for inputting a continuous determination frequency target value. It is included. The continuous determination frequency target value is a value related to determination by the determination unit 467. Details of the target number of continuous determination times will be described later. The screen 37 may be configured to receive other information in addition to these pieces of information. When the user inputs a value in the standby time input field, the setting reception unit 462 receives the value input by the user as the standby time. When the user inputs a value in the monitor interval input field, the setting reception unit 462 receives the value input by the user as the monitor interval. When the user inputs a value in the continuous determination number target value input field, the setting reception unit 462 receives the value input by the user as the continuous determination number target value.

  FIG. 4 is a diagram illustrating an example of a measurement condition setting screen. That is, the screen 38 shown in FIG. 4 is an example of a measurement condition setting screen. In this example, the screen 38 includes a screen 40. The screen 38 may be configured to include other GUIs in addition to the screen 40, or may be configured to include other GUIs instead of the screen 40. The screen 40 is a screen that receives information indicating the presence / absence of determination by the determination unit 467. In the example illustrated in FIG. 4, a check box associated with the character string “set target count” is displayed on the screen 40. When an operation (for example, click, tap, etc.) for selecting the check box is received from the user, the setting reception unit 462 validates the determination by the determination unit 467. On the other hand, when the operation for selecting the check box from the user (for example, click, tap, etc.) is not received, the setting reception unit 462 invalidates the determination by the determination unit 467.

<Process in which the control device calculates the count of radiation emitted from the detection target nuclide>
Hereinafter, a process in which the control device 4 calculates the count of radiation emitted from the detection target nuclide will be described with reference to FIG. FIG. 5 is a diagram illustrating an example of a processing flow in which the control device 4 calculates the count of radiation emitted from the detection target nuclide. In the following, on the above-described target count setting screen, the setting reception unit 462 receives in advance the one or more detection target nuclides and the target count for each radiation emitted by each of the one or more detection target nuclides. The case will be described. Hereinafter, a case in which the determination by the determination unit 467 is validated in advance by the setting reception unit 462 will be described.

  The setting receiving unit 462 repeatedly performs the process of step S120 for each of one or more detection target nuclides received in advance from the user (step S110).

  The setting reception unit 462 determines whether a target count of radiation emitted from the detection target nuclide selected in step S110 is received in advance (step S120). Here, in step S120, when a plurality of radiations having different energies are emitted from the detection target nuclide selected in step S110, the setting reception unit 462 receives all target counts for each of the plurality of radiations in advance. Therefore, it is determined that the target count of the radiation emitted from the detection target nuclide is received in advance. When the setting reception unit 462 determines that the target count of radiation emitted from the detection target nuclide selected in step S110 has not been received in advance (NO in step S120), the control unit 46 ends the process. On the other hand, if it is determined that the target count of radiation emitted from the detection target nuclide selected in step S110 has been received in advance (YES in step S120), the setting reception unit 462 transitions to step S110, and the next Select the target detection nuclide. If there is no unselected detection target nuclide in step S110, the setting reception unit 462 proceeds to step S130.

  In step S130, the setting reception unit 462 determines whether or not the continuous determination frequency target value has been received in advance (step S130). Here, the continuous determination number target value will be described. For example, when the number of detection target nuclides selected by the user is one, the measurement control unit 469 determines that the predetermined number of determination units 467 continuously determines that the count calculated by the count calculation unit 465 is equal to or greater than the target count. The calculation of the spectrum by the wave height analyzer 3 is terminated. This predetermined number of times is the continuous determination number of times target value. Hereinafter, as an example, a case where the target number of times of continuous determination is 5 will be described. In addition, the continuous determination frequency target value may be less than 5 times or more than 5 times. On the other hand, when there are a plurality of detection target nuclides selected by the user, the measurement control unit 469 continuously determines that the radiation count is greater than or equal to the target count of the radiation for all the radiation emitted from each of the plurality of detection target nuclides. When the determination unit 467 determines the predetermined number of times (that is, the target value of the continuous determination number), the spectrum calculation by the wave height analyzer 3 is terminated. For example, the determination results by the determination unit 467 for each of the count of radiation emitted from the detection target nuclide A which is a certain two detection target nuclides and the count of radiation emitted from the detection target nuclide B are shown in Table 1 below. In the case of the determination result shown in (5), the measurement control unit 469 terminates the spectrum calculation by the wave height analyzer 3 when the determination by the determination unit 467 for the ninth time is completed. This is because the count of radiation emitted from the detection target nuclide A reaches the target count five times continuously in the determination result by the determination unit 467 for the ninth time, and the radiation emitted from the detection target nuclide B This is because the count reaches the target count five times continuously.

  When the setting reception unit 462 determines that the continuous determination number of times target value has not been received in advance in step S130 (step S130-NO), the control unit 46 ends the process. On the other hand, when the setting reception unit 462 determines that the continuous determination frequency target value has been received in advance (step S130—YES), the determination unit 467 sets the variable indicating the number of continuous determinations stored in the storage unit 42 to 0. Initialization is performed (step S140). Next, the measurement control unit 469 determines whether or not an operation for starting the measurement of radiation by the measurement system 1 has been received in advance (step S150). When the measurement control unit 469 determines that the operation has not been received in advance (step S150—NO), the control unit 46 ends the process. On the other hand, when it is determined that the operation has been received in advance (YES in step S150), the measurement control unit 469 starts from the time at which the operation is received, that is, the start time of the measurement period described above, via the target count setting screen. The setting reception unit 462 waits until the standby time received from the user has elapsed (step S160). When the standby time has elapsed from the start time (step S160—YES), the measurement control unit 469 starts the spectrum calculation by the wave height analyzer 3 (step S170). Specifically, in step S170, the measurement control unit 469 is a signal of radiation detected by the detection unit 2 at the time when the standby time has elapsed from the start time, and each of various types of radiation emitted from the sample. Is started by the wave height analyzer 3. Here, the detection unit 2 outputs a signal indicating the detected radiation to the wave height analyzer 3 every time the radiation is detected. For this reason, acquisition of the signal by the wave height analyzer 3 is continuously performed until the measurement control unit 469 finishes the calculation of the spectrum by the wave height analyzer 3 in step S240. Then, when the monitoring interval elapses from the time when the standby time has elapsed from the start time, the measurement control unit 469 transmits the spectrum to the pulse height analyzer 3 based on the plurality of signals acquired from the detection unit 2 up to the current time. Calculation is performed (step S170). The pulse height analyzer 3 outputs information indicating the calculated spectrum to the controller 4. The spectrum acquisition unit 463 acquires the information from the wave height analyzer 3.

  Next, the count calculation unit 465 repeats the process of step S190 for each of one or more detection target nuclides received in advance from the user (step S180).

  The count calculation unit 465 calculates the count of radiation emitted from the detection target nuclide selected in step S180 based on the spectrum indicated by the information acquired by the spectrum acquisition unit 463 in step S170 (step S190). Here, in step S190, when a plurality of radiations having different energies are emitted from the detection target nuclide selected in step S180, the count calculation unit 465 calculates a count for each of the plurality of radiations.

  In step S190, the count calculation unit 465 responds to the energy of the radiation radiated from the detection target nuclide selected in step S180 out of the parts included in the spectrum indicated by the information acquired by the spectrum acquisition unit 463 in step S170. A peak region which is a portion (in other words, a region including a portion where a peak appears), a first base region for obtaining a net count on an energy side lower than the peak, and a first region for obtaining a net count on an energy side higher than the peak. It is specified as an ROI (Region Of Interest) region including two base regions. The part corresponding to the energy is, for example, a part included in a predetermined range with the energy as a central value. The predetermined range is, for example, a range of ± 10% of the energy, but may be another range instead. In addition, when a plurality of radiations having different energies are emitted from the detection target nuclide, the count calculation unit 465 specifies a portion corresponding to each energy of the plurality of radiations as an ROI region. The method by which the count calculation unit 465 calculates the radiation count corresponding to each of the specified one or more ROI regions may be a known method or a method to be developed in the future. For example, for each of the specified one or more ROI regions, the count calculation unit 465 uses the counts of the peak region, the first base region, and the second base region to count the radiation corresponding to the ROI region. Calculated by the method. Specifically, for each of the specified one or more ROI regions, the count calculation unit 465 subtracts the area of the portion representing the background in the ROI region from the area of the spectrum included in the ROI region (that is, the net count). (Net count)) is calculated as the count of radiation corresponding to the ROI region. Note that the count calculation unit 465 is a function obtained by fitting a certain function (for example, a normal distribution function) to the shape of the spectrum included in the ROI region instead of the configuration in which the count is calculated by the Kobel method. The net area of the function in the ROI region may be calculated as the count.

  After the repetitive processing of step S170 to step S190 is performed, the display control unit 461 is a count calculated by the count calculation unit 465, and the radiation emitted by each of one or more detection target nuclides received in advance from the user. Is displayed on the display unit 45 (step S200). For example, the display control unit 461 displays the table shown in FIG. 6 on the aforementioned operation screen. FIG. 6 is a diagram illustrating an example of a table displayed on the display unit 45 in step S200. In the table shown in FIG. 6, the detection target nuclide information, the target count of the radiation emitted by the detection target nuclide indicated by the detection target nuclide information, and the count of the radiation calculated in the repetition process of steps S170 to S190. And the scheduled measurement end date and time of the radiation count are associated with each other. The measurement end scheduled date and time of the radiation count is the date and time when the radiation count is estimated to reach the target count. In addition, when displaying the said table | surface on the operation screen, the display control part 461 calculates the measurement end date and time of the said radiation count based on the half life of the said detection target nuclide. In the example shown in FIG. 6, the target count of the radiation emitted by the detection target nuclide A is 10,000, the count of the radiation calculated in the repetitive processing is 8000, and the measurement of the count of the radiation is completed. The scheduled date and time is 10:00 on November 16, 2016. In this example, the target count of the radiation emitted by the detection target nuclide B is 4000, the count of the radiation calculated in the repetition process is 2000, and the scheduled measurement end date and time of the count of the radiation Is 11:20 on November 16, 2016.

  After the process of step S200 is performed, the determination unit 467 calculates the radiation calculated in the repetition process of steps S170 to S190 for all of the radiation emitted by each of the one or more detection target nuclides received in advance from the user. It is determined whether or not the count is equal to or greater than the target count (step S210). When it is determined that the radiation count calculated in the iterative process is not equal to or greater than the target count for at least one radiation emitted by each of the one or more detection target nuclides (step S210—NO), a determination unit 467 initializes a variable indicating the number of continuous determinations stored in advance in the storage unit 42 to 0 (step S280). Then, the measurement control unit 469 transitions to step S170 and waits until the monitoring interval elapses from the time when the wave height analyzer 3 calculates the previous spectrum. When the monitoring interval elapses from the time, the measurement control unit 469 causes the wave height analyzer 3 to calculate a spectrum based on a plurality of signals acquired from the detection unit 2 up to the current time. The pulse height analyzer 3 outputs information indicating the calculated spectrum to the controller 4. The spectrum acquisition unit 463 acquires the information from the wave height analyzer 3. On the other hand, when it is determined that the radiation count calculated in the iterative process is greater than or equal to the target count for all of the radiation emitted by each of the one or more detection target nuclides (step S210—YES), the determination unit 467. Adds 1 to the variable indicating the number of continuous determinations stored in advance in the storage unit 42 (step S220).

  Next, the measurement control unit 469 determines whether or not the variable indicating the number of continuous determinations stored in advance in the storage unit 42 is 5 or more (step S230). When it determines with the variable which shows the said continuous determination frequency | count not being 5 or more (step S230-NO), the measurement control part 469 transfers to step S170, and monitoring interval is from the time when the wave height analyzer 3 calculated the last spectrum. Wait until it has passed. When the monitoring interval elapses from the time, the measurement control unit 469 causes the wave height analyzer 3 to calculate a spectrum based on a plurality of signals acquired from the detection unit 2 up to the current time. The pulse height analyzer 3 outputs information indicating the calculated spectrum to the controller 4. The spectrum acquisition unit 463 acquires the information from the wave height analyzer 3. On the other hand, when it is determined that the variable indicating the number of continuous determinations is 5 or more (step S230—YES), the measurement control unit 469 causes the wave height analyzer 3 to finish acquiring signals from the detection unit 2 (step S240). ).

  Next, the measurement control unit 469 causes the wave height analyzer 3 to calculate a spectrum based on a plurality of signals acquired from the detection unit 2 from the start time of the measurement period to the current time (step S250). Next, the measurement control unit 469 ends the spectrum calculation by the wave height analyzer 3 (step S255).

  Next, the count calculation unit 465 repeats the process of step S270 for each of one or more detection target nuclides received in advance from the user (step S260).

  The count calculation unit 465 calculates the count of radiation emitted from the detection target nuclide selected in step S260 based on the spectrum indicated by the information acquired by the spectrum acquisition unit 463 in step S250 (step S270). Here, since the process of step S270 is the same process as the process of step S190, detailed description is abbreviate | omitted. And after the repetition process of step S260-step S270 is performed, the control part 46 complete | finishes a process.

  The setting reception unit 462 may be configured to receive a measurement time from the user via a screen such as the above-described target count setting screen. In this case, in the case of the process of step S230 (step S230-NO), the measurement control unit 469 determines whether the measurement time has elapsed from the start time of the measurement period before transitioning to step S170. . If it is determined that the measurement time has not elapsed since the start time, the measurement control unit 469 proceeds to step S170. On the other hand, when it is determined that the measurement time has elapsed from the start time, the measurement control unit 469 proceeds to step S240. In this case, since it is in the process of step S230 (step S230-NO), the measurement system 1 counts a part of the counts of radiation emitted by each of the one or more detection target nuclides received in advance from the user. Does not reach the target count, and it is necessary to remeasure various types of radiation emitted from the sample. In the measurement system X described above, such remeasurement is started by receiving an operation for starting the remeasurement from the user.

  Here, the control device 4 may be configured to automatically start such re-measurement. For example, in the first measurement of various types of radiation emitted from the sample, the control device 4 has reached a target count of some of the counts of radiation emitted by each of the one or more detection target nuclides. If not, the second measurement of various types of radiation emitted from the sample is started without accepting an operation from the user (automatically). Then, the control device 4 counts the radiation calculated by the first measurement and the radiation calculated by the second measurement for each of the radiation emitted by each of the one or more detection target nuclides. Add the count.

  Specifically, the control device 4 automatically starts remeasurement of various types of radiation emitted from the sample by performing the processing of the flowchart shown in FIG. FIG. 7 is a diagram illustrating an example of a flow of processing in which the control device 4 performs remeasurement of various types of radiation emitted from the sample. Here, the measurement time received from the user by the setting reception unit 462 described above is calculated based on, for example, the time estimated from the start time of the measurement period that the detection target radiation count is equal to or greater than the target count, and is greater than the time. A long time. Note that the measurement time may be a time that is equal to or shorter than the time estimated from the start time of the measurement period when the count of the detection target radiation is equal to or greater than the target count.

  Each of the functional units included in the control unit 46 executes the process of the flowchart shown in FIG. 5 as the first count calculation process (step S310). Next, the determination unit 467 performs the calculation of the radiation calculated in the repetition processing of Step S260 to Step S270 in the first count calculation processing for all of the radiation emitted by each of the one or more detection target nuclides received in advance from the user. It is determined whether or not the count is equal to or greater than the target count (step S320). Hereinafter, for convenience of explanation, each count calculated in the first count calculation process will be referred to as a first count. When it determines with the 1st count of radiation being more than a target count about all the radiation radiated | emitted by each of the said 1 or more detection object nuclide (step S320-YES), the control part 46 complete | finishes a process. On the other hand, if it is determined that the first count of radiation is not equal to or greater than the target count for at least one radiation emitted by each of the one or more detection target nuclides (step S320—NO), the control unit 46 includes. Each of the functional units executes the process of the flowchart shown in FIG. 5 as the second count calculation process (step S330). Here, in step S330, the control device 4 executes the second count calculation process while holding various conditions (that is, measurement conditions) set in the control device 4 when the first count calculation process is executed. To do. In the second count calculation process, the control device 4 may be configured to use a time shorter than the measurement time in the first count calculation process as the measurement time in the second count calculation process. Hereinafter, for convenience of explanation, each count calculated in the second count calculation process will be referred to as a second count.

  Next, the count calculation unit 465 adds the first count of radiation and the second count of radiation for each of the radiation emitted by each of the one or more detection target nuclides received in advance from the user, A summation process is performed in which the calculated value is a new first count (step S340). Then, the determination unit 467 transitions to step S320 and determines whether or not the first count of radiation is greater than or equal to the target count for all of the radiation emitted by each of the one or more detection target nuclides received in advance from the user. Determine again.

  As described above, the control device 4 can perform re-measurement of various kinds of radiation emitted from the sample by performing the processing of the flowchart shown in FIG. As a result, the control device 4 can reduce the labor required for remeasurement of radiation. Note that the control device 4 performs the process of step S320 after the process of step S340 is performed in order to prevent the process of step S320 to step S340 from being repeated for a predetermined time or longer due to some cause. It may be configured to determine whether or not the repeated end condition is satisfied before being performed. The predetermined time is, for example, five times the above-described measurement time. Alternatively, the predetermined time may be a time shorter than five times the measurement time or a time longer than five times the measurement time. The repetition end condition is, for example, that the real-time elapsed time that is the elapsed time from the start time of the measurement period in the first count calculation process to the current time exceeds a predetermined first upper limit value, The live time elapsed time, which is the total time of the time required and the time required for the second count calculation process, exceeds a predetermined second upper limit value, and the number of times the second count calculation process is performed is determined in advance. It is a condition including at least one of exceeding the third upper limit value. In this case, when the repeated end condition includes a plurality of conditions, the control device 4 determines whether or not the repeated end including one or more conditions selected by the user is satisfied. In this case, the control device 4 may be configured to accept in advance from the user whether to enable or disable the determination of whether or not the repeated end condition is satisfied.

  The determination unit 467 described above determines whether or not the calculated radiation count is equal to or greater than the target count for all of the radiation emitted by each of the one or more detection target nuclides received in advance from the user. However, instead of this, the radiation count calculated for all of some of the radiation received from the user among the radiation emitted by each of the one or more detection target nuclides received from the user in advance. May be configured to determine whether or not is equal to or greater than the target count.

  In addition, when calculating the radiation count corresponding to a certain ROI region based on the Kobel method, the count calculation unit 465 described above, when a radiation peak different from the radiation appears in the ROI region, the ROI The structure which changes the range of an area | region may be sufficient.

  In addition, the detection target nuclide described above may include an unknown nuclide. In this case, the control device 4 detects the appearance of an unknown radiation peak in the spectrum indicated by the information acquired from the pulse height analysis device 3. And the control apparatus 4 specifies the ROI area | region corresponding to the detected said peak, and calculates the count of the said radiation in the specified said ROI area | region. When the calculated count exceeds the predetermined fourth upper limit, the control device 4 is likely to have contaminated the sample with an unknown radionuclide, and therefore the sample is contaminated with an unknown radionuclide. The display unit 45 displays information indicating that there is a high possibility of being present. Moreover, the control apparatus 4 complete | finishes calculation of the spectrum by the wave height analyzer 3 in this case. The unknown nuclide corresponds to the nuclide that is not included in the list indicated by the information indicating the list of nuclides stored in the storage unit 42 in advance and the correspondence information described above among the channels of the wave height analyzer 3. It includes at least one of a nuclide that emits radiation corresponding to a count value of a channel in which no energy is present, and a nuclide whose correspondence with the energy of the emitted radiation is unknown (unknown). The control device 4 may have a configuration in which the user can select whether or not to include an unknown nuclide in the detection target nuclide, and cannot select whether or not to include an unknown nuclide in the detection target nuclide. May be. When the configuration is such that it is impossible to select whether or not to include an unknown nuclide in the detection target nuclide, the control device 4 always includes the unknown nuclide in the detection target nuclide.

  Further, the control device 4 may be configured such that the measurement time described above can be changed at any timing in steps S110 to S280 described above.

  As described above, the control device 4 in the present embodiment radiates from the detection target nuclide using the radiation spectrum calculated by the pulse height analysis device 3 based on the signal indicating the radiation detected by the detection unit 2. The calculated count of the radiation is calculated, it is determined whether or not the calculated count is equal to or greater than the target count, and the calculation of the spectrum by the wave height analyzer 3 is terminated based on the determination result. Thereby, the control apparatus 4 can suppress that time until the count of the radiation radiated | emitted from a detection target nuclide reaches | attains a target count becomes long.

  In addition, the control device 4 calculates the count of radiation emitted from the detection target nuclide at a plurality of timings within the measurement period, and when it is determined a predetermined number of times that the count is equal to or greater than the target count, 3 finishes the spectrum calculation. Thereby, it can suppress more reliably that the time until the count of the radiation radiated | emitted from a detection object nuclide reaches | attains a target count becomes long.

  In addition, when the measurement time based on the time estimated that the count of radiation emitted from the detection target nuclide becomes equal to or greater than the target count has elapsed from the start time of the measurement period, the control device 4 The calculation is terminated. Thereby, the control apparatus 4 can complete | finish the calculation of the spectrum by the wave height analyzer 3 even if it is a case where the count of the radiation radiated | emitted from a detection target nuclide does not become more than a target count for some reason.

  In addition, when the measurement time has elapsed from the start time of the measurement period and the calculation of the spectrum by the wave height analyzer 3 is terminated, the control device 4 counts the radiation emitted from the detection target nuclide less than the target count. If it is determined that the spectrum is calculated, spectrum calculation by the wave height analyzer 3 is resumed. Thereby, the control apparatus 4 can reduce the effort which is required for the remeasurement of the radiation radiated from the sample.

  In addition, the control device 4 is a measurement time based on a time estimated from the start time of the measurement period that the number of radiation radiated from the detection target nuclide is equal to or greater than the target count, and a measurement time longer than the time is elapsed If so, the spectrum calculation by the wave height analyzer 3 is terminated. Thereby, the control apparatus 4 can complete | finish the calculation of the spectrum by the wave height analyzer 3 even if it is a case where the count of the radiation radiated | emitted from a detection target nuclide does not become more than a target count for some reason.

  The control device 4 receives a plurality of detection target nuclides different from each other in advance, calculates a count for each radiation emitted from each of the received plurality of detection target nuclides, and detects the detection target nuclides for each of the plurality of detection target nuclides. It is determined whether the count of radiation emitted from the target count corresponding to the radiation is greater than or equal to the target count for each of the plurality of detection target nuclides. When it is determined that the target count is greater than or equal to the radiation, the spectrum calculation by the wave height analyzer 3 is terminated. Thereby, the control apparatus 4 can suppress that the count of the radiation detected by the detection part 2 within the measurement period becomes less than the target count for all of the radiation emitted from each of the plurality of detection target nuclides. .

  In addition, the measurement system 1 uses the spectrum of the radiation calculated by the wave height analyzer 3 based on the signal indicating the radiation detected by the detection unit 2 included in the measurement system 1, and the radiation emitted from the detection target nuclide. Are calculated at a plurality of timings within the measurement period, it is determined whether or not the calculated count is equal to or greater than the target count, and the spectrum calculation by the wave height analyzer 3 is terminated based on the determination result. Thereby, the measurement system 1 can suppress that time until the count of the radiation radiated | emitted from a detection target nuclide reaches | attains a target count becomes long.

  Further, the measurement system 1 uses the spectrum of the radiation calculated by the wave height analyzer 3 included in the measurement system 1 based on a signal indicating the radiation detected by the detection unit included in the measurement system 1 to detect the detection target nuclide. The count of the radiation emitted from is calculated, it is determined whether or not the calculated count is equal to or greater than the target count, and the spectrum calculation by the wave height analyzer 3 is terminated based on the determination result. Thereby, the measurement system 1 can suppress that time until the count of the radiation radiated | emitted from a detection target nuclide reaches | attains a target count becomes long.

  The embodiment of the present invention has been described in detail with reference to the drawings. However, the specific configuration is not limited to this embodiment, and changes, substitutions, deletions, and the like are possible without departing from the gist of the present invention. May be.

  Further, a program for realizing the function of an arbitrary component in the device described above (for example, the control device 4) is recorded on a computer-readable recording medium, and the program is read by a computer system and executed. You may do it. Here, the “computer system” includes hardware such as an OS (Operating System) and peripheral devices. The “computer-readable recording medium” refers to a portable medium such as a flexible disk, a magneto-optical disk, a ROM, a CD (Compact Disk) -ROM, or a storage device such as a hard disk built in the computer system. . Furthermore, “computer-readable recording medium” means a volatile memory (RAM) inside a computer system that becomes a server or client when a program is transmitted via a network such as the Internet or a communication line such as a telephone line. In addition, those holding programs for a certain period of time are also included.

In addition, the above program may be transmitted from a computer system storing the program in a storage device or the like to another computer system via a transmission medium or by a transmission wave in the transmission medium. Here, the “transmission medium” for transmitting the program refers to a medium having a function of transmitting information, such as a network (communication network) such as the Internet or a communication line (communication line) such as a telephone line.
Further, the above program may be for realizing a part of the functions described above. Further, the program may be a so-called difference file (difference program) that can realize the above-described functions in combination with a program already recorded in the computer system.

DESCRIPTION OF SYMBOLS 1 ... Measurement system, 2 ... Detection part, 3 ... Wave height analyzer, 4 ... Control apparatus, 42 ... Memory | storage part, 43 ... Input reception part, 44 ... Communication part, 45 ... Display part, 46 ... Control part, 461 ... Display Control unit, 462 ... Setting reception unit, 463 ... Spectrum acquisition unit, 465 ... Count calculation unit, 467 ... Determination unit, 469 ... Measurement control unit

Claims (10)

A count calculation unit that calculates the count of radiation emitted from the detection target nuclide using the spectrum of the radiation calculated by the pulse height analyzer based on the signal indicating the radiation detected by the detection unit;
A determination unit that determines whether the count calculated by the count calculation unit is equal to or greater than a target count;
A measurement control unit for terminating calculation of the spectrum by the wave height analyzer based on a determination result of the determination unit;
A control device comprising: The count calculation unit calculates the count at a plurality of timings within a measurement period,
The measurement control unit terminates the calculation of the spectrum by the pulse height analyzer when the determination unit continuously determines that the count is equal to or greater than the target count a predetermined number of times.
The control device according to claim 1. The measurement control unit further terminates the calculation of the spectrum by the pulse height analyzer when a measurement time based on a time estimated from the start time of the measurement period to reach the target count is exceeded.
The control device according to claim 2. The measurement control unit determines that the calculation by the wave height analyzer is terminated when the measurement time has elapsed from the start time, and the determination unit determines that the count is less than the target count. If so, restart the calculation of the spectrum by the wave height analyzer,
The control device according to claim 3. The measurement time is longer than the time,
The control device according to claim 3 or 4. The count calculation unit receives a plurality of detection target nuclides different from each other in advance, calculates the count for each radiation emitted from each of the received plurality of detection target nuclides,
The determination unit determines, for each of the plurality of detection target nuclides, whether the count of radiation emitted from the detection target nuclide is equal to or greater than the target count according to the radiation,
When the determination unit determines that the count of the radiation emitted from the detection target nuclide is equal to or greater than the target count according to the radiation for all of the radiation of each of the plurality of detection target nuclides Ending the calculation of the spectrum by the wave height analyzer,
The control device according to any one of claims 1 to 5. A control device according to any one of claims 1 to 6;
The detection unit;
Measuring system. A control device according to any one of claims 1 to 6;
The detection unit;
The wave height analyzer;
Measuring system. Further comprising a shield for suppressing the incidence of radiation from the outside to the detection unit,
The measurement system according to claim 7 or 8. On the computer,
A count calculation step for calculating a count of radiation emitted from the detection target nuclide using the spectrum of the radiation calculated by the pulse height analyzer based on a signal indicating the radiation detected by the detection unit;
A determination step of determining whether or not the count calculated by the count calculation step is equal to or greater than a target count;
A measurement control step for terminating the calculation of the spectrum by the wave height analyzer based on the determination result of the determination step;
A program that executes

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