JP2016080529A - Radiation measuring device and radiation measuring method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a radiation measuring technique capable of grasping a flying direction of many radiation rays.SOLUTION: A radiation measuring device 10 includes: radiation intensity distribution detection means 20 for acquiring a radiation intensity distribution inside an object space at the desired azimuth angle and elevation angle; radiation does detection means 30 for detecting a radiation dose rate inside the object space; and an image generation part 53 for generating an image that superposes the radiation intensity distribution covering all the directions, a point arranged with the radiation dose detection means 30, and a radiation dose rate of the point on the image showing a layout of the object space based on the radiation intensity distribution covering all directions with one point acquired using a plurality of different radiation intensity distributions acquired by the radiation intensity distribution detection means 20 at one point inside the object space, the radiation dose rate, space layout information of the object space, and the radiation intensity distribution detection means 20 and position information of the radiation dose detection means 30.SELECTED DRAWING: Figure 2

Description

  Embodiments described herein relate generally to a radiation measurement apparatus and a radiation measurement method.

  Understanding the radiation dose rate in a nuclear power plant is one of the most important issues in radiation management. As a device for grasping the radiation dose, a radiation dose detector having a function of wirelessly transmitting the measured radiation dose and self-position information to a computer server is arranged in the building, and is two-dimensional or three-dimensional on the computer server. There is a device that displays radiation dose information at a certain point on the layout. In addition, there is a device that displays a one-dimensional or two-dimensional distribution of radiation dose in real time so that the radiation dose that changes from moment to moment can be accurately grasped.

Japanese Patent No. 4371723 JP2012-207969A

  When it is necessary to take measures to reduce the exposure dose, it is necessary to shield the incoming radiation. To that end, it is first necessary to grasp the direction in which a lot of radiation comes.

  However, with conventional devices, it is possible to know the two-dimensional or three-dimensional radiation dose at a certain point in time, or the one-dimensional or two-dimensional distribution of the radiation dose that changes from moment to moment. When we carry out, we cannot grasp direction that a lot of radiation comes.

  Of course, in order to measure only radiation from a specific direction, it is possible to measure while changing the orientation in all directions after attaching a collimator to a conventional device that displays a one-dimensional or two-dimensional distribution of radiation dose in real time. If a special measurement different from the normal measurement is performed, the direction in which a large amount of radiation comes in can be grasped.

  However, in order to make it possible to carry out such special measurements, it is inevitable that the apparatus structure is complicated, the measurement method is complicated, and the measurement time is long. That is, there is a problem that the simplicity of the device structure, the simplicity of the measurement method, and the short measurement time are sacrificed by making it possible to grasp the direction in which a large amount of radiation comes.

  Embodiments of the present invention have been made in view of the above-described circumstances, and an object of the present invention is to provide a radiation measurement apparatus and a radiation measurement method that can grasp in a short time the direction in which a large amount of radiation comes.

  In order to solve the above-described problems, a radiation measurement apparatus according to an embodiment of the present invention includes a radiation intensity distribution detection unit that acquires a radiation intensity distribution in a target space at a desired azimuth angle and elevation angle; Radiation dose detection means for detecting a radiation dose rate, and all directions centered on the one point obtained using a plurality of different radiation intensity distributions acquired by the radiation intensity distribution detection means at one point in the target space , The radiation dose rate measured by the radiation dose detector, the layout information of the target space, and the position information of the radiation intensity distribution detector and the radiation dose detector. The radiation intensity distribution covering all directions, the spot where the radiation dose detecting means is disposed, and the radiation dose rate at the spot are superimposed on the image showing the layout of Characterized by comprising an image producing means for producing an image.

  In order to solve the above-described problem, a radiation measurement method according to an embodiment of the present invention includes a radiation intensity distribution detection unit that acquires a radiation intensity distribution in a target space at a desired azimuth angle and elevation angle, A radiation measurement method that uses a radiation dose detection means that detects a radiation dose rate and a computer that performs a calculation process to obtain a measurement result of the radiation, wherein the radiation intensity distribution detection means is in the target space. Radiation intensities covering all directions with the one point as a central point obtained by adjusting the azimuth angle and elevation angle to obtain a plurality of different radiation intensity distributions at a set point and using the acquired radiation intensity distributions A step of obtaining a distribution; a step of obtaining the radiation dose rate of the target space by the radiation dose detecting means; and an image generating means provided in the computer comprising: Radiation intensity distribution covering all directions with the one point as a central point obtained in the step of obtaining the distribution, the spatial radiation dose rate obtained in the step of obtaining the radiation dose rate of the target space, and the spatial layout of the target space Based on the information and the position information of the radiation intensity distribution detecting means and the radiation dose detecting means, the image showing the layout of the space for measuring the radiation, the radiation intensity distribution covering all directions, and the radiation dose Generating an image in which the position of the detection means and the spatial radiation dose rate obtained by the radiation dose detection means are superimposed on each other.

  According to the embodiment of the present invention, in addition to grasping the radiation dose rate, it is possible to grasp in a short time the direction in which a lot of radiation comes.

FIG. 2 is a schematic diagram showing a configuration example of a radiation measurement apparatus according to an embodiment of the present invention and showing in more detail the configurations of a radiation intensity distribution detector, a radiation dose detector, and a layout information detector. 1 is a configuration example of a radiation measurement apparatus according to an embodiment of the present invention, and is a schematic diagram showing the configuration of a measurement computer and a relay computer in more detail. Schematic which shows the example of application of the radiation measuring device which concerns on embodiment of this invention. It is explanatory drawing explaining the radiation intensity distribution which the radiation intensity distribution detector of the radiation measuring device which concerns on embodiment of this invention acquires, (A) is the schematic which shows the example of arrangement | positioning of a radiation intensity distribution detector, (B) Schematic which shows the example of a radiation intensity distribution which a radiation intensity distribution detector acquires. Schematic which shows the example of arrangement | positioning of the radiation dose detector of the radiation measuring device which concerns on embodiment of this invention. Schematic which shows the example of arrangement | positioning of the layout information detector of the radiation measuring device which concerns on embodiment of this invention. Schematic which shows the example of a display of the radiation measurement result by the radiation measuring device which concerns on embodiment of this invention. Schematic which shows the example of arrangement | positioning of the radiation intensity distribution detector and radiation dose detector for performing the simulation at the time of radiation shielding by the radiation measuring device which concerns on embodiment of this invention. Schematic which shows the example of a display of the simulation execution result at the time of the radiation shielding by the radiation measuring device which concerns on embodiment of this invention. Schematic which shows the example of a display of the surface dose rate measurement result of the unarranged location of the radiation dose detector by the radiation measuring device concerning the embodiment of the present invention. Explanatory drawing explaining an example of the update of the radiation intensity distribution by the radiation measuring device which concerns on embodiment of this invention.

  Hereinafter, a radiation measurement apparatus and a radiation measurement method according to embodiments of the present invention will be described with reference to the drawings.

  1 and 2 are schematic diagrams illustrating a configuration example of a radiation measurement apparatus 10 which is an example of a radiation measurement apparatus according to an embodiment of the present invention.

  More specifically, FIG. 1 is a schematic diagram of the radiation measuring apparatus 10 showing the configuration example of the radiation intensity distribution detector 20, the radiation dose detector 30, and the layout information detector 40 in more detail, and FIG. It is the schematic of the radiation measuring device 10 which showed the example of a structure of the computer 50 and the relay computer 60 in detail.

  The radiation measurement apparatus 10 measures, for example, a radiation intensity distribution detector 20 as a radiation intensity distribution detection unit that detects a radiation intensity distribution, a radiation dose detector 30 as a radiation dose detection unit that detects a radiation dose, and measures radiation. A layout information detector 40 for acquiring layout information of a space to be received, a measurement computer 50 as an image generation unit that receives a detection result of the radiation dose from the radiation dose detector 30, and a relay computer 60 that transmits the measurement result to the measurement computer 50; Moving means 70 for moving the radiation dose detector 30 to a desired location.

  First, the radiation intensity distribution detector 20, the radiation dose detector 30, and the layout information detector 40 in the radiation measuring apparatus 10 will be described with reference to FIG.

  The radiation intensity distribution detector 20 (FIG. 1) is a means for detecting a one-dimensional or two-dimensional intensity distribution of a radiation dose at a certain point in time, which comes to the radiation intensity distribution detector 20, for example, a radiation intensity distribution detector 21, an angle adjustment unit 22, a transmission unit 23, an image processing unit 24, a display unit 25, a storage unit 26, and a control unit 27.

  The radiation intensity distribution detection unit 21 acquires a one-dimensional or two-dimensional radiation intensity distribution with an azimuth angle and an elevation angle adjusted to a desired value.

  The angle adjustment unit 22 adjusts the azimuth angle and elevation angle when the radiation intensity distribution detection unit 21 acquires the radiation intensity distribution to desired values, respectively. In the radiation intensity distribution detector 20, the angle adjustment unit 22 adjusts the azimuth angle and the elevation angle, thereby enabling acquisition of radiation intensity distributions in different spatial ranges, and by using the acquired radiation intensity distributions in different spatial ranges. A radiation intensity distribution (omnidirectional radiation intensity distribution) covering all directions centered on the radiation intensity distribution detector 20 (center point) can be generated.

  The transmission unit 23 has an information transmission function with an external device. In the radiation measurement apparatus 10, for example, acquired data such as radiation intensity distribution is transmitted from the transmission unit 23 to the measurement computer 50.

  For example, the image processing unit 24 generates an image that visually represents the radiation intensity distribution based on the radiation intensity distribution acquired by the radiation intensity distribution detection unit 21. The radiation intensity distribution generated by the image processing unit 24 is generated based on individual radiation intensity distributions acquired by the radiation intensity distribution detection unit 21 as well as individual radiation intensity distributions acquired by the radiation intensity distribution detection unit 21. A radiation intensity distribution covering all directions (omnidirectional radiation intensity distribution) and the like are also included.

  The display unit 25 includes, for example, a display having a display function, and displays each one-dimensional or two-dimensional radiation intensity distribution acquired by the radiation intensity distribution detection unit 21 or uses a plurality of radiation intensity distributions. The radiation intensity distribution covering all directions constructed in this way (omnidirectional radiation intensity distribution) is displayed.

  The storage unit 26 includes a storage area from which data can be read (written) and written (written), and has a function of holding data in the storage area. For example, the radiation intensity distribution acquired by the radiation intensity distribution detector 21 is stored in the storage unit 26.

  The control unit 27 includes each processing unit of the radiation intensity distribution detector 20 (radiation intensity distribution detection unit 21, angle adjustment unit 22, transmission unit 23, image processing unit 24, display unit 25, and storage unit 26). To control.

  The radiation dose detector 30 (FIG. 1) is a means for detecting in real time the radiation dose (radiation dose rate) flying to the radiation dose detector 30, for example, a radiation dose rate detection unit 31, a transmission unit 32, A storage unit 33 and a control unit 34 are provided.

  The radiation dose rate detection unit 31 detects radiation in a space in which radiation is measured, and measures (acquires), for example, the radiation dose per unit time, that is, the radiation dose rate. Therefore, the radiation dose for the desired time can be obtained by integrating the radiation dose rate for the desired time. The radiation dose rate detection unit 31 measures the radiation dose rate (atmosphere dose rate) in the atmosphere if the position where the radiation dose detector 30 is disposed is in the atmosphere. Measure the surface radiation dose rate (surface dose rate).

  Similar to the transmission unit 23, the transmission unit 32 has an information transmission function with an external device. In the radiation measurement apparatus 10, data such as the acquired radiation dose rate is transmitted from the transmission unit 32 to the measurement computer 50.

  Similar to the storage unit 26, the storage unit 33 includes a storage area where data can be read (read) and written (write), and has a function of holding data in the storage area. For example, information such as the radiation dose rate acquired by the radiation dose rate detection unit 31 is stored in the storage unit 33.

  The control unit 34 controls each processing unit (radiation dose rate detection unit 31, transmission unit 32, and storage unit 33) of the radiation dose detector 30.

  The layout information detector 40 (FIG. 1) is a layout information detection unit capable of measuring a three-dimensional shape such as a three-dimensional laser scanner. For example, the layout information detection unit 41, the position input unit 42, and the transmission unit 43, a storage unit 44, and a control unit 45.

  The layout information detection unit 41 has a function of detecting a two-dimensional or three-dimensional layout and acquiring information on the detected layout (layout information). In the radiation measurement apparatus 10, the layout information detection unit 41 acquires layout information of a space where radiation is measured. The layout information acquired by the layout information detection unit 41 is given to the control unit 45 and transmitted to the measurement computer 50 via the transmission unit 43. Further, it is held in the storage unit 43 as necessary.

  The input unit 42 has a function as an input interface and transmits the received input operation to the control unit 45.

  Similar to the transmission unit 23 and the like, the transmission unit 43 has an information transmission function with an external device. In the radiation measurement apparatus 10, for example, data such as layout information acquired from the transmission unit 43 and position information of the radiation intensity distribution detector 20 is transmitted to the measurement computer 50.

  Similar to the storage unit 26 and the like, the storage unit 44 includes a storage area where data can be read (read) and written (write), and has a function of holding data in the storage area. The storage unit 44 holds information such as layout information acquired by the layout information detection unit 41 and position information of the radiation intensity distribution detector 20 input from the input unit 42, for example.

  The control unit 45 controls each processing unit (layout information detection unit 41, transmission unit 43, and storage unit 44) of the layout information detector 40. When the content of the input operation received by the input unit 42 is received from the input unit 42, the control unit 45 controls the processing unit related to the command corresponding to the input operation and causes the command to be executed.

  Next, the computer (measurement computer 50 and relay computer 60) in the radiation measurement apparatus 10 will be described with reference to FIG.

  In the radiation measuring apparatus 10, the measurement computer 50 serves as at least an image generating unit. For example, an input unit 51a and an output unit 51b having a function as an input / output interface, a transmission unit 52, and an image generating unit. An image generation unit 53, a simulation unit 54 as a simulation unit, a surface dose rate measurement unit 55 as a surface dose rate measurement unit, an intensity distribution update unit 56 as a radiation intensity distribution update unit, and an alarm unit as an alarm unit 57, a storage unit 58 as storage means, and a control unit 59.

  The input unit 51 a has a function as an input interface (input unit), and transmits the received input operation to the control unit 59.

  The output unit 51b has a function as an output interface (output unit). For example, a display unit that performs output by image display, a print unit that performs output by printing, and a voice output that outputs sound such as a siren that notifies an alarm. And general output means such as light emitting means for performing output by light emission such as a warning light for notifying an alarm.

  Similar to the transmission unit 23 and the like, the transmission unit 52 has an information transmission function with an external device. The radiation measuring apparatus 10 receives information transmitted from the radiation intensity distribution detector 20, the radiation dose detector 30, the layout information detector 40, and the relay computer 60 that are external devices when viewed from the measurement computer 50. The received information is given to the control unit 59, and the processing unit (output unit 51b, transmission unit 52, image generation unit 53, simulation unit 54, surface dose rate measurement unit 55, intensity distribution necessary for processing execution by the control unit 59 is provided. The update unit 56, the alarm unit 57, and the storage unit 58) are provided.

  In the image generation unit 53, a radiation intensity distribution (omnidirectional radiation intensity distribution) covering all directions centered on the radiation intensity distribution detector 20 and a radiation dose detector 30 are arranged in an image showing the layout of the space. And a function of generating an image in which the radiation dose rate measured at a certain location and the position information of the radiation intensity distribution detection means and the radiation dose detection means are superimposed.

  Here, the image indicating the layout of the space is the layout information acquired by the layout information detector 40 and is received from the layout information detector 40. Further, a radiation intensity distribution (omnidirectional radiation intensity distribution) covering all directions with the radiation intensity distribution detector 20 as the central point is received from the radiation intensity distribution detector 20. Further, the radiation dose rate measured at the place where the radiation dose detector 30 is disposed is received from the radiation dose detector 30.

  For example, the simulation unit 54 has a function of calculating (simulating) how the radiation dose changes when the radiation is shielded by arranging a shielding material in the space where the radiation is measured. The simulation unit 54 receives information on the location, material, shape, and dimensions of the shielding material, and when the shielding material type, thickness, and shielding range are determined, the shielding material database (hereinafter referred to as database DB). Reference is made to 81 and the atmospheric dose rate calculation information 82 after shielding, and the atmospheric dose rate after shielding is calculated.

  The surface dose rate measuring unit 55 is based on the surface dose rate measured at the position where the radiation dose detector 30 is arranged, and the position (radiation) where the radiation dose detector 30 in the space for measuring radiation is not arranged. A surface dose rate measuring function for calculating a surface dose rate at a position different from the position where the quantity detector 30 is disposed. The surface dose rate measurement unit 55 is a position where the radiation dose detector 30 in the space where radiation is measured is not arranged, and upon receiving an input of a point where the surface dose rate is to be measured, the layout of the space where radiation is measured The surface dose rate at the input point is calculated with reference to the information and the surface dose rate calculation information 83.

  The intensity distribution update unit 56 measures the radiation intensity distribution after the change without measuring the radiation intensity distribution again when the already acquired radiation intensity distribution in the space where the radiation is measured changes due to the implementation of decontamination work or the like. It has a function to calculate and update based on the change of the surface dose rate. When receiving an instruction to update the radiation intensity distribution, the intensity distribution updating unit 56 calculates based on the change in the measured surface dose rate and updates the already acquired radiation intensity distribution.

  The alarm unit 57 has an alarm function for issuing an alarm when the radiation dose rate of the detected atmosphere exceeds a set threshold value. For example, the alarm unit 57 is in a situation where an alarm should be output in order to notify the operator of danger when the radiation dose rate of the atmosphere exceeds the threshold set in the area where the operator works, for example. It is determined that there is, and that effect is transmitted to the control unit 59.

  When the alarm unit 57 informs the control unit 59 that the alarm should be output, the control unit 59 gives an alarm output command to the output unit 51b and issues an alarm. For example, the alarm is output as an image for displaying the alarm on a display unit such as a display, or is output as a light emission command for informing the light emitting unit such as a warning lamp of the alarm state.

  Similar to the storage unit 26 and the like, the storage unit 58 includes a storage area where data can be read (read) and written (write), and has a function of holding data in the storage area. The storage unit 58 includes, for example, a measurement program (not shown) that is software necessary for radiation measurement in the measurement computer 50, and a shielding material having information that associates the type and thickness of the shielding material with radiation transmittance. Radiation dose detector based on DB81, post-shielding atmospheric dose rate calculation information 82 having calculation information for calculating the shielded atmospheric dose rate, and the surface dose rate at the location where the radiation dose detector 30 is disposed Information such as the surface dose rate calculation information 83 for calculating the surface dose rate of the portion where 30 is not arranged is held.

  The control unit 59 includes each processing unit (an output unit 51b, a transmission unit 52, an image generation unit 53, a simulation unit) of the measurement computer 50 realized by the cooperation of the measurement computer 50 and a measurement program (not shown). 54, the surface dose rate measurement unit 55, the intensity distribution update unit 56, the alarm unit 57, and the storage unit 58).

  The relay computer 60 includes, for example, a transmission unit 61 that transmits and receives information and a control unit 62 that controls the transmission unit 61. The relay computer 60 is connected to the radiation dose detector 30 and the measurement computer 50 so as to be able to transmit, and has a function as a relay means for transmitting data between the radiation dose detector 30 and the measurement computer 50. When the transmission unit 61 receives the radiation dose rate transmitted from the radiation dose detector 30, the relay computer 60 transmits the received radiation dose rate to the measurement computer 50.

  Note that the radiation measuring apparatus 10 has been described with reference to one configuration example, and is not necessarily limited to the configuration example described above. For example, the radiation measuring apparatus 10 shown in FIG. 1 includes a radiation intensity detector 20, a radiation dose detector 30, a layout information detector 40, a measurement computer 50, and a relay computer 60. There may be a plurality of units 20, radiation dose detectors 30, layout information detectors 40, measurement computers 50, and relay computers 60.

  Further, depending on the application environment of the radiation measuring apparatus 10, the radiation measuring apparatus 10 in which the relay computer 60 is omitted is adopted, or the radiation measuring apparatus 10 having a plurality of radiation dose detectors 30 and omitting the moving means 70. Can be adopted.

  Furthermore, in the radiation measuring apparatus 10, the layout information detector 40 may not be permanently installed. For example, the layout information detector 40 is not necessarily required if it is not necessary to newly acquire layout information, for example, when it is assumed that use in an environment where accurate layout information is acquired. Accordingly, accurate layout information and position information of the radiation intensity detector 20 and the radiation dose detector 30 are acquired, and layout information and position information of the radiation intensity detector 20 and the radiation dose detector 30 are newly acquired. If application conditions such as no need to do so are prepared, the radiation measurement apparatus 10 in which the layout information detector 40 is omitted can be employed.

  Furthermore, the measurement computer 50 is, for example, part or all of a processing unit that provides additional functions of radiation measurement, such as a simulation unit 54, a surface dose rate measurement unit 55, an intensity distribution update unit 56, and an alarm unit 57. May be omitted.

  The radiation measuring apparatus according to the embodiment of the present invention, such as the radiation measuring apparatus 10 configured as described above, is applied to, for example, radiation management (monitoring of radiation dose in the atmosphere) in the radiation management area 3 serving as a site. Can do.

  FIG. 3 is a schematic diagram showing an application example of the radiation measuring apparatus according to the embodiment of the present invention, and more specifically shows an application example when measuring the radiation intensity distribution and the atmospheric dose rate in the radiation management area 3. FIG.

  In FIG. 3, from the viewpoint of simplifying the drawing, a part of the configuration of the apparatus (for example, the layout information detector 40, the measurement computer 50, and the relay computer 60 shown in FIGS. 1 and 2) is omitted. ing.

  In the radiation management area 3 illustrated in FIG. 3, the highly radioactive substance 5 is submerged in the pool 4 (underwater). If the highly radioactive substance 5 is in the water, there is no danger that the worker 6 working in the radiation control area 3 will be exposed to a high dose of radiation, but the highly radioactive substance 5 is moved for administrative reasons. Since it may be necessary, the situation where the radioactive material 5 is accidentally exposed to the air under the situation where the worker 6 is around the pool 4, that is, the viewpoint of preventing the worker 6 from being in danger. The radiation dose (atmosphere dose) in the atmosphere is monitored. The radiation measuring apparatus 10 can be applied to the monitoring described above, for example.

  Conventionally, monitoring of the radiation dose in the radiation management area 3 is generally performed by monitoring the radiation dose by installing a radiation dose detector 30 in the vicinity of the worker 6 from the viewpoint of preventing the worker 6 from being exposed to danger. Is.

  Further, in the conventional radiation dose monitoring, the high radioactive substance 5 is exposed from the water surface and the atmospheric dose rapidly rises. Abnormality is detected by detecting this sudden rise, so the water level of the pool 4 and the operator 6 When the vertical position is close, after the rapid increase in the atmospheric dose due to exposure of the highly radioactive substance 5 from the water surface, the timing for notifying the operator 6 of the danger is delayed. Therefore, when the vertical position of the water surface of the pool 4 and the worker 6 is close, for example, the height of 2 [m] or higher is higher than the height of a general adult, and the entire work place of the worker 6 can be seen from above. The radiation dose detector 30 is installed at a high height.

  When the radiation measuring apparatus according to the embodiment of the present invention is applied to radiation dose monitoring in the radiation management area 3, for example, layout information detection means capable of measuring a three-dimensional shape of the layout information of the radiation management area 3 is provided. The radiation intensity distribution detector 20 and the radiation dose detector 30 are installed in the radiation management area 3 while being acquired in advance. The radiation dose detector 30 is installed in at least two directions on the near side (for example, the left side in FIG. 3) and the far side (for example, the right side in FIG. 3) with respect to the pool 4 from the viewpoint of realizing early abnormality detection. Then, the height of the installation place is set to a height at which the entire work place of the worker 6 can be viewed.

  3, the measurement computer 50 (more specifically, the image generation unit 53) omits the layout information of the radiation management area 3, the radiation intensity distribution acquired by the radiation intensity distribution detector 20, and the radiation dose detector 30. The radiation dose rate measured and the position information of the radiation intensity distribution detector 20 and the radiation dose detector 30 in the radiation management area 3 are acquired, and the radiation intensity distribution detector 20 is centered based on the acquired information. A radiation intensity distribution covering all directions as a point (omnidirectional radiation intensity distribution), a radiation dose rate measured at a location where the radiation dose detector 30 is disposed, and position information of the radiation intensity distribution detection means Is superimposed on the image showing the layout of the space.

  In this way, the radiation dose monitoring (hereinafter referred to as “proposed monitoring”) to which the radiation measuring apparatus according to the embodiment of the present invention is applied can solve the problems occurring in conventional monitoring. . Specifically, in the case of conventional monitoring, an abnormality can be detected before the highly radioactive substance 5 is exposed from the water surface of the pool 4, but with this alone, in either direction relative to the position of the operator 6 It is not possible to determine whether there is a problem, and it is also impossible to determine the urgency of the abnormality. Therefore, in the conventional monitoring, there is a problem that the worker 6 may be damaged by moving in the direction in which the abnormality is detected by mistake.

  In contrast, the proposed monitoring can detect changes in radiation intensity distribution and radiation dose, so it is possible to determine which direction the abnormality is not possible with conventional monitoring, It is possible to appropriately notify the person 6 of the direction in which there is an abnormality.

  Then, the effect | action (each function) of the radiation measuring device 10 and the radiation measuring method using the radiation measuring device 10 are demonstrated.

  The radiation measurement apparatus 10 has a function of measuring radiation, grasping a radiation dose rate, and grasping a direction in which a lot of radiation comes (hereinafter simply referred to as “radiation measurement function”). The accompanying functions include, for example, a simulation function, a surface dose rate measurement function, an intensity distribution update function, and an alarm function. Each function of the radiation measuring apparatus 10 and a radiation measuring method by the radiation measuring apparatus 10 using each function will be described.

[Radiation measurement function]
FIG. 4 is an explanatory diagram for explaining the radiation intensity distribution acquired by the radiation intensity distribution detector 20 of the radiation measuring apparatus 10 (FIGS. 1 and 2). FIG. 4A is an arrangement example of the radiation intensity distribution detector 20. FIG. 4B is a schematic diagram illustrating an example of a radiation intensity distribution D acquired by the radiation intensity distribution detector 20.

  FIGS. 5 and 6 are schematic views showing examples of arrangement of the radiation dose detector 30 and the layout information detector 40, respectively.

  FIG. 7 is a schematic diagram showing a display example of a radiation measurement result by the radiation measuring apparatus 10 (FIGS. 1 and 2).

  In the radiation measuring apparatus 10 (FIGS. 1 and 2), the measurement result measured in the space for measuring radiation is visualized as an image and displayed on the output unit 51b (for example, FIG. 7). More specifically, the measurement computer 50 (image generation unit 53) serving as an image generation unit adds all of the measurement results of the radiation intensity distribution detector 20 as a central point to an image showing the layout of the space in which the radiation is measured. An image in which the radiation intensity distribution covering all directions (omnidirectional radiation intensity distribution), the radiation dose rate measured by the radiation dose detector 30, and the position information of the radiation intensity distribution detector 20 and the radiation dose detector 30 are superimposed (FIG. 7). Is generated and displayed on the output unit 51b, and the measurement result of radiation is provided to the user as visual information capable of grasping in a short time the direction in which a large amount of radiation comes.

  In the radiation measuring apparatus 10, first, a radiation intensity distribution (omnidirectional radiation intensity distribution) covering all directions centered on one point set in a space where radiation is measured, a radiation dose rate of the space, Space layout information and position information of the radiation intensity distribution detector 20 and the radiation dose detector 30 disposed in the space are required.

  For example, as shown in FIG. 4A, the radiation intensity distribution is acquired by a radiation intensity distribution detector 20 arranged at a point P1 which is an arbitrary point in a space where radiation is measured. The radiation intensity distribution detector 20 has a predetermined field of view, for example, a two-dimensional radiation intensity distribution (vertical x horizontal rectangle in FIG. 4B) as shown in FIG. Get D.

  In the radiation measuring apparatus 10, the field of view is changed by adjusting the azimuth angle and the elevation angle of the radiation intensity distribution detector 20, and a plurality of radiation intensity distributions of different fields of view are acquired, and these are continuously combined to obtain the radiation intensity. Radiation intensity distribution (omnidirectional radiation intensity distribution) covering an azimuth angle range of 360 degrees and an elevation angle range of ± 90 degrees with the distribution detector 20 as a central point, that is, an omnidirectional range centering on the radiation intensity distribution detector 20 Get. The radiation intensity distribution obtained by the radiation intensity distribution detector 20 is transmitted from the radiation intensity distribution detector 20 to the measurement computer 50.

  The radiation intensity distribution covering all directions (omnidirectional radiation intensity distribution) may be generated by the radiation intensity distribution detector 20, or may be generated for each individual radiation intensity distribution transmitted from the radiation intensity distribution detector 20. Measurement computer 50 may generate based on it.

  For example, as shown in FIG. 5, the radiation dose rate is acquired by a radiation dose detector 30 arranged in a space where radiation is measured. The radiation dose rate acquired by the radiation dose detector 30 is transmitted from the radiation dose detector 30 to the measurement computer 50.

  The layout information of the space in which the radiation is measured is acquired by a layout information detector 40 arranged in the space in which the radiation is measured, for example, as shown in FIG. The layout information of the space acquired by the layout information detector 40 is transmitted from the layout information detector 40 to the measurement computer 50.

  Further, the position information (FIG. 4A) of the radiation intensity detector 20 and the position information (FIG. 5) of the radiation dose detector 30 are input from the input unit 42 of the layout information detector 40 (FIG. 1), for example. By being sent from the transmission unit 43 of the layout information detector 40 to the transmission unit 52 (FIG. 2) of the measurement computer 50, it is transmitted from the layout information detector 40 to the measurement computer 50. Note that the position information of the radiation intensity detector 20 and the radiation dose detector 30 can be directly input from the input unit 51 a (FIG. 2) of the measurement computer 50 to the measurement computer 50.

  It should be noted that the layout information of the space, the layout information, the radiation intensity detector 20 and the radiation are newly added when the accurate layout information and the position information of the radiation intensity detector 20 and the radiation dose detector 30 are acquired in advance. If there is no need to acquire the position information of the quantity detector 30, it can be omitted. In this case, the layout information and the position information of the radiation intensity detector 20 and the radiation dose detector 30 are stored in a recording medium that can be read by the measurement computer 50, and the measurement computer 50 performs the layout information and the radiation intensity when performing the measurement. The position information of the detector 20 and the radiation dose detector 30 may be read out.

  The radiation intensity distribution (omnidirectional radiation intensity distribution) covering all directions centering on one point set in the space where the measurement computer 50 measures radiation, the radiation dose rate of the space, and the layout of the space When the information and the position information of the radiation intensity distribution detector 20 and the radiation dose detector 30 arranged in the space are acquired, the image generation unit 53 as an image generation unit subsequently acquires the acquired one point. An image showing a measurement result of radiation based on a radiation intensity distribution covering all directions in the center (omnidirectional radiation intensity distribution), the radiation dose rate, the spatial layout information, and position information of the radiation dose detection means Generate.

  For example, as shown in FIG. 7, the image showing the measurement result of the radiation is an image showing the layout of the space in which the radiation is measured (however, the left side and the rear side with respect to the radiation intensity distribution detector 20 shown in FIG. 4). Radiation intensity distribution covering all directions centered on the radiation intensity distribution detector 20 (however, the direction is not shown) (however, on the left side with respect to the radiation intensity distribution detector 20 shown in FIG. 4) And the rear side (rear direction is not displayed), the radiation dose rate acquired by the radiation dose detector 30, and the position information of the radiation intensity distribution detector 20 and the radiation dose detector 30 are superimposed.

  The image showing the measurement result of the radiation illustrated in FIG. 7 is a front (front) direction, a right direction, and an upward direction with respect to the radiation intensity distribution detector 20 illustrated in FIG. 4 in consideration of display visibility. In this example, the radiation intensity distribution of the radiation flying from the four downward directions to the radiation intensity distribution detector 20 is displayed, but the direction with respect to the radiation intensity distribution detector 20 capable of displaying the radiation intensity distribution can be switched. . The switching can be performed, for example, by designating numerical values of azimuth angle and elevation angle.

  The example of the image shown in FIG. 7 is an example of presenting the result of measuring radiation to the user as visual information, and the method of presenting the result of measuring radiation is not limited to this example.

[Simulation function]
FIG. 8 is a schematic diagram showing an arrangement example of the radiation intensity distribution detector 30 and the radiation dose detector 30 for executing a simulation at the time of radiation shielding by the radiation measuring apparatus 10 (FIGS. 1 and 2). It is the schematic which shows the example of a display of the execution result of the said simulation displayed on the output part 51b (FIG. 2).

  The radiation measuring apparatus 10 has a simulation function for calculating (simulating) how the radiation dose changes when the radiation is shielded by arranging a shielding material in the space where the radiation is measured. In order to use this, the radiation intensity distribution detector 20 and the radiation detector 30 need to be in a predetermined positional relationship.

  Specifically, as illustrated in FIG. 8, the radiation intensity distribution detector 20 and the radiation detector 30 arranged to generate a radiation intensity distribution in a space for measuring radiation include, for example, P1 or the like. It is necessary to arrange at the same point. As a result, the radiation measuring apparatus 10 can acquire the radiation intensity distribution and the atmospheric dose rate at the point P1, and as illustrated in FIG. 9, the type and size (shape and thickness) of the shielding material 7 and By designating the arrangement location of the shielding material 7, the radiation dose after radiation shielding by the arrangement of the shielding material 7 can be obtained, and the radiation dose before and after radiation shielding can be compared and verified in advance.

  In using the simulation function, first, using the radiation measurement function, the radiation intensity distribution in all directions centered on a desired point (for example, P1 shown in FIG. 8) in the space where radiation is measured Get the atmospheric dose rate.

  Subsequently, the radiation measuring apparatus 10 has information on what kind of shielding material 7 (FIG. 9) is arranged at which position in the space where radiation is measured (the type and size of the shielding material, and the location of the shielding material). Information). Information on the type and thickness of the shielding material 7 and the location of the shielding material 7 can be input by, for example, the user performing an input operation from the input unit 51a.

  When the radiation measuring apparatus 10 receives information about the type and size (shape and thickness) of the shielding material 7 and the location of the shielding material 7, information stored in the shielding material DB 81 by the simulation unit 54 as a simulation unit. The radiation transmittance of the shielding material 7 is obtained from the type and thickness of the shielding material 7 arranged. In addition, the simulation unit 54 refers to the post-shielding atmospheric dose rate calculation information 82 and acquires calculation information for calculating the post-shielding atmospheric dose rate. The calculation information for calculating the atmospheric dose rate after shielding is, for example, a calculation formula for deriving the atmospheric dose rate after shielding and information on parameters used in the calculation formula.

  Here, the total amount of radiation dose data flying from all directions is S, the atmospheric dose rate before shielding acquired by the radiation dose detector 30 arranged at point P1, T, and the shielding material 7 at a certain place (point). When the total radiation dose after shielding by placing and shielding the radiation is U, the atmospheric dose rate C at the point P1 can be expressed as in equation (2) using equation (1).

  Therefore, if the equation (2) and the radiation transmittance of the shielding material 7 are used, the radiation dose rate C after shielding can be obtained. Therefore, the simulation unit 54 obtains the radiation dose rate C at the point P1 after shielding using the equation (2) and the radiation transmittance of the shielding material 7. By determining the radiation dose rate C at the point P1 after shielding, the degree of reduction of the radiation dose (radiation dose rate) due to radiation shielding (a desired shielding material 7 is disposed at a desired position in the space where radiation is measured) can be reduced. It can be simulated in advance.

  The radiation shielding simulation execution result in the radiation measuring apparatus 10 is, for example, as shown in FIG. 9, the shielding material 7 arranged in the space where the radiation dose rate before shielding, the radiation dose rate after shielding, and the radiation are measured. It is done by displaying and.

  As described above, according to the radiation measuring apparatus 10 having the simulation function, the radiation due to the arrangement of the shielding material 7 can be specified by specifying the type and size (shape and thickness) of the shielding material 7 and the arrangement location of the shielding material 7. The radiation dose after shielding can be determined, and the radiation dose before and after radiation shielding can be compared and verified in advance. Therefore, the radiation dose rate reduction effect by actually arranging the shielding material 7 can be grasped in advance, and the radiation shielding by the shielding material 7 is optimized (the arrangement condition that maximizes the radiation dose rate reduction effect is specified). Can do.

[Surface dose rate measurement function]
FIG. 10 is a schematic diagram illustrating a display example of the surface dose rate measurement result of an unplaced portion of the radiation dose detector 30 (FIGS. 1 and 2) by the radiation measurement apparatus 10 (FIGS. 1 and 2).

  The radiation measurement apparatus 10 has a surface dose rate measurement function for measuring a surface dose rate in a space for measuring radiation, and the measurement range is a surface on which the radiation dose detector 30 is arranged (for example, shown in FIG. 10). In addition to the surface dose rate at point K), the surface dose rate at the surface where the radiation dose detector 30 is not disposed (for example, point L shown in FIG. 10) is also included. That is, the radiation measuring apparatus 10 can also measure the surface dose rate of the surface where the radiation dose detector 30 is not disposed.

  In order to measure the surface dose rate on the surface where the radiation dose detector 30 is not arranged, first, in the space where the radiation intensity distribution detector 20 (FIGS. 1 and 2) measures radiation using the radiation measurement function. A reference for measuring the radiation dose distribution in all directions centered on one desired point (for example, P1 shown in FIG. 4) and measuring the surface dose rate such as the K point shown in FIG. It is necessary that one point to be a point is set in a space for measuring radiation, the radiation dose detector 30 is arranged at the reference point (point K), and the radiation dose detector 30 acquires the surface dose rate. Become.

  The radiation intensity distribution acquired by the radiation intensity distribution detector 20 is the intensity distribution of the radiation dose flying to the point P1, and the radiation intensity distribution at the reference point (point K) where the radiation dose detector 30 is arranged. If there is no radionuclide present in the space where radiation is being measured, but the same nuclide is assumed, the surface dose rate at the reference point (K point) and the radiation flying from the reference point (K point) to the position P1 If the ratio between the dose and the radiation dose flying from the arbitrary point other than the reference point on the surface (for example, the L point shown in FIG. 10) to the position P1 is specified, the surface dose rate at the arbitrary point is calculated. Can do. However, if the radiation comes only from either a point L or a point K from a certain radiation source, and the other side does not fly by a shield or the like, or is attenuated, an error occurs in the calculation result. For this reason, in order to obtain a highly accurate calculation result, it is preferable to perform under the condition that there is no shielding object, or to consider the shielding effect by the shielding object.

  Based on the above principle, the radiation measuring apparatus 10 calculates a surface dose rate at an arbitrary point other than the reference point, and presents the calculation result to the user as a measurement result of the surface dose rate at an arbitrary point other than the reference point.

  In the radiation measurement apparatus 10 having the surface dose rate measurement function, first, a radiation intensity distribution in all directions centered on a desired point (for example, point P1 shown in FIG. 4) in a space where radiation is measured, The surface dose rate at the reference point (for example, the K point shown in FIG. 10) for measuring the surface dose rate set in the space for measuring radiation is acquired.

  Subsequently, for example, the radiation measuring apparatus 10 receives position information of a point where the surface dose rate is to be measured among arbitrary points on the surface in the space where the radiation such as point L shown in FIG. 10 is measured. The position information of the point where the surface dose rate is desired to be measured can be input by the user performing an input operation from the input unit 51a, for example.

  When the radiation measuring apparatus 10 receives the position information of the point where the surface dose rate is desired to be measured, the surface dose rate measuring unit 55 as the surface dose rate measuring means refers to the surface dose rate calculation information 83 and calculates the surface dose rate. Acquire information necessary for calculation. Information necessary for calculating the surface dose rate at the point where the surface dose rate is to be measured is, for example, an arithmetic expression for calculating the surface dose rate and information on parameters used in the arithmetic expression.

  Here, assuming that the radionuclide existing in the space where radiation is measured is the same nuclide, the reference point for measuring the surface dose rate is K point, the point where the surface dose rate is to be measured is L point, K point And the amount of radiation flying from the point L to the center point of the radiation intensity distribution is set to K1 and L1, respectively, and further, the distance correction coefficient according to the distance from the center point to the point K and L point is set to M. The surface dose rate at point L can be expressed by equation (3).

The distance correction coefficient M included in the right side of the equation (3) is a correction factor for the surface dose rate considering that the radiation dose is inversely proportional to the square of the distance. As shown in the equation (4), The ratio of the square of the distance D _K from the center point to the K point to the square of the distance D _L from the center point to the L point. When the distance D _L is equal to the distance D _K (when D _L = D _K ), the distance correction coefficient M is 1 (distance correction coefficient M = 1).

The surface dose rate measurement unit 55 is configured to calculate information on the equations (3) and (4), the surface dose rate at the K point, which is a parameter used in the equations (3) and (4), and the radiation intensity distribution from the K point. K1 which is a radiation dose flying to the center point of L, L1 which is a radiation dose flying from the L point to the center point of the radiation intensity distribution, a distance D _K from the center point to the K point, and from the center point to the L point by using the value of the distance D _L, and calculates the radiation dose rate of the formula (3) L-point.

Here, the surface dose rate at the K point is acquired by the radiation dose detector 30, and the radiation doses K 1 and L 1 flying from the K point and the L point to the center point of the radiation intensity distribution are acquired by the radiation intensity distribution detector 20. Is done. Further, the values of the distance D _K and the distance D _L are calculated using layout information given in advance to the measurement computer 50 and position information of the center point, the K point, and the L point of the radiation intensity distribution. The value to be used is used.

  When the surface dose rate measurement unit 55 calculates the surface dose rate, the radiation measurement apparatus 10 displays the calculation result on the output unit 51b as the measurement result. For example, as shown in FIG. 10, the measurement results include the location of the point L input as the point where the surface dose rate is to be measured and the surface dose rate at the point L input as the point where the surface dose rate is to be measured. Shown with distribution.

  Thus, according to the radiation measuring apparatus 10 having the surface dose rate measuring function, the radiation intensity distribution in all directions with an arbitrary point in the space in which the radiation is measured as the center point, and the space in which the radiation is measured Obtain the surface dose rate at the reference point for measuring the surface dose rate set in, the position information of the point where you want to measure the surface dose rate in the space where you want to measure the radiation, and these acquired information and the surface Using the information necessary for calculating the surface dose rate read from the dose rate calculation information 83, the surface dose rate at the point (surface) where the radiation dose detector 30 is not arranged can be measured.

[Intensity distribution update function]
FIG. 11 is an explanatory diagram for explaining an example of updating the radiation intensity distribution by the radiation measuring apparatus 10 (FIGS. 1 and 2).

  The radiation measuring apparatus 10 has an intensity distribution update function for grasping the changed radiation intensity distribution without acquiring the radiation intensity distribution data again after the radiation intensity distribution has changed due to, for example, implementation of decontamination work.

  In the radiation measuring apparatus 10, the radiation measuring function is used, and radiation in all directions centered on a place (for example, point P1 shown in FIG. 4) where the radiation intensity distribution detector 20 (FIGS. 1 and 2) is arranged. The intensity distribution and the radiation dose rate at the place where the radiation dose detector 30 is arranged are acquired, and the acquired radiation intensity distribution and the radiation dose rate are displayed as measurement results, for example, as shown in FIG. .

  Thereafter, for example, as shown in FIG. 11, among the surfaces that are contaminated with radioactive substances (with the radioactive substances attached), the wall surface (surface) S1 located on the front side is subjected to decontamination work, It is assumed that the decontamination work is not performed on the wall surface (surface) S2 in the other direction. By carrying out such decontamination work, the amount of radiation flying to the radiation intensity distribution detector 20 (FIGS. 1 and 2) flying from the direction of the wall surface (surface) S1 on which the decontamination work has been carried out is reduced. The radiation intensity distribution varies.

  As described above, when the radiation intensity distribution changes, the radiation intensity is generally measured again by the radiation intensity distribution detector 20 in the past. However, the radiation intensity measurement operation is performed by the radiation intensity distribution detector. When the operator uses 20 to measure, the worker is exposed, while when measuring with an unmanned robot equipped with the radiation intensity distribution detector 20, there is a problem that the measurement work becomes large. .

  Therefore, in the radiation measuring apparatus 10, the total amount of radiation that arrives at the radiation intensity distribution detector 20 after decontamination is given by an expression that replaces “shielding” in Expression (2) with “decontamination”, that is, decontamination. Paying attention to the fact that the ratio of the radiation dose rate before and after the dyeing becomes equal to the ratio of the total radiation dose before and after the decontamination, and using this relationship, the radiation flying to the radiation intensity distribution detector 20 from the direction in which the decontamination was carried out. Calculate the intensity distribution of the quantity. Note that it is assumed that decontamination is performed uniformly without unevenness (unevenness).

  In the radiation measuring apparatus 10, when an intensity distribution update command is given, the radiation intensity distribution is updated using the intensity distribution update function. More specifically, the intensity distribution update unit 56 obtains the radiation dose rate measured by the radiation dose detector 30, and is given by equation (2) with reference to the post-shielding atmosphere dose rate calculation information 82. Information on the parameters used in the arithmetic expression and expression (2) is acquired.

  Subsequently, the intensity distribution updating unit 56 treats the acquired arithmetic expression (2) as an expression in which “shielding” in the expression (2) is read as “decontamination”, and radiation before and after decontamination. Radiation flying to the radiation intensity distribution detector 20 after shielding using the dose rate and the total radiation dose before decontamination, that is, the intensity distribution of the radiation dose flying to the radiation intensity distribution detector 20 before decontamination. Calculate the intensity distribution of the quantity. When the intensity distribution of the radiation dose flying to the radiation intensity distribution detector 20 after shielding is obtained, the intensity distribution update unit 56 corresponds to the obtained intensity distribution of the radiation dose corresponding to the initially obtained radiation intensity distribution. Replacing with the intensity distribution of the radiation dose flying from the direction to the radiation intensity distribution detector 20 updates the initially obtained radiation intensity distribution (FIG. 11).

  Thus, according to the radiation measuring apparatus 10 having the intensity distribution update function, the radiation intensity distribution acquired before the intensity distribution changes, the radiation dose rate acquired before the change of the radiation intensity distribution, and after the change. Using the acquired radiation dose rate and the relationship that the ratio of the radiation dose rate before and after the change of the radiation intensity distribution is equal to the ratio of the total radiation dose before and after the change of the radiation intensity distribution, Since the radiation intensity distribution after the change can be calculated, the radiation intensity distribution after the change of the radiation intensity distribution is output without acquiring the radiation intensity distribution data again by using the radiation intensity distribution detector 20 again. It can be displayed on the part 51b.

[Alarm function]
The radiation measuring apparatus 10 (FIGS. 1 and 2) has an alarm function for issuing an alarm when the detected radiation dose rate exceeds a set threshold value. The alarm function of the radiation measuring apparatus 10 determines whether or not the radiation dose rate being measured exceeds a preset threshold, and if it exceeds the threshold, an alarm should be issued. This is a function that determines that a warning is issued by a method perceivable by the user.

  In the radiation measuring apparatus 10, for example, it is determined whether or not a warning should be issued by the alarm unit 57 provided in the measurement computer 50, and an alarm for notifying the operator of the danger based on the determination result. Is issued (output). For example, the alarm is issued by displaying an image for displaying the alarm on a display as the output unit 51b, causing a warning light as the output unit 51b to emit light (lighting), or from a speaker as the output unit 51b. It can be performed by a method such as making a sound.

  According to the radiation measuring apparatus 10 having an alarm function, it is determined whether or not an alarm should be issued from the radiation measurement result, and if an alarm should be issued, an alarm is issued. be able to.

  Further, as in the application example illustrated in FIG. 3, for example, the radiation dose detectors 30 are installed on both the right side and the left side of the pool 4 in which the highly radioactive substance 5 is in water. By displaying both the radiation dose rates measured in step 6, in addition to the atmospheric dose rate in the vicinity of the worker 6, it is possible to grasp which direction is abnormal relative to the worker 6. As a result, it is possible to notify which direction is more dangerous by an alarm, and it is possible to further reduce the risk that the worker 6 is exposed to a high dose of radiation.

  So far, each function of the radiation measurement apparatus 10 (FIGS. 1 and 2) and the radiation measurement method by the radiation measurement apparatus 10 using each function have been described. However, the radiation measurement apparatus 10 has the radiation measurement function as an essential function. As long as the remaining functions such as a simulation function are not necessarily required. Moreover, although each function was demonstrated separately, these functions do not necessarily act separately in the radiation measuring apparatus 10, and may act in combination.

  For example, when a shielding material is arranged in a space where radiation is measured using both the simulation function and the surface dose rate measurement function, the surface dose rate at a point where the radiation dose detector 30 is not arranged is determined. You can also simulate how it changes.

  As described above, according to the radiation measurement apparatus 10 (FIGS. 1 and 2) and the radiation measurement method using the radiation measurement apparatus 10, the plane or space in which the radiation is measured is expressed in a two-dimensional or three-dimensional layout, and the layout is displayed on the layout. The radiation intensity distribution covering all directions centered on the point where the radiation intensity distribution detector 20 is arranged and the radiation dose rate at a predetermined point in the plane or space measured by the radiation dose detector 30 are presented together. Therefore, not only can the radiation direction of radiation at the center point (viewpoint position) be grasped, but also the atmospheric dose rate at a two-dimensional or three-dimensional position in a plane or space where radiation is measured can be always grasped.

  In addition, according to the radiation measurement apparatus 10 and the radiation measurement method using the radiation measurement apparatus 10, information that associates the type and thickness of the shielding material with the radiation transmittance by using the simulation function of the radiation measurement apparatus 10. Based on the calculation information for calculating the atmospheric dose rate after shielding, how the ambient dose rate after shielding changes when the shielding material of what kind and size is placed ( Simulation). In the radiation measurement apparatus 10 and the radiation measurement method using the radiation measurement apparatus 10, for example, by arranging a desired shielding material on a two-dimensional or three-dimensional layout, the radiation dose before placing the shielding material (before shielding). It is calculated how much the radiation dose rate at the position where the intensity distribution and the atmospheric dose rate are measured is reduced after the shielding material is arranged (after shielding), and two-dimensional or three-dimensional as illustrated in FIG. Numerical values can be displayed on the layout.

  Furthermore, according to the radiation measuring device 10 and the radiation measuring method using the radiation measuring device 10, the surface dose rate measuring function of the radiation measuring device 10 is used, so that one surface (in a space where radiation is measured) ( For example, it can be obtained by calculating the surface dose rate at a location different from the point K shown in FIG. 10 (for example, the point L shown in FIG. 10).

  According to the radiation measurement apparatus 10 and the radiation measurement method using the radiation measurement apparatus 10, a two-dimensional or three-dimensional layout image displayed based on the layout information by using the intensity distribution update function of the radiation measurement apparatus 10. After the radiation intensity distribution displayed above changes, the changed radiation intensity distribution can be grasped without acquiring radiation intensity distribution data again.

  In addition, according to the radiation measurement apparatus 10 and the radiation measurement method using the radiation measurement apparatus 10, changes in the radiation intensity distribution and the radiation dose can be captured, so which direction is abnormal and the emergency of the abnormality The degree can also be judged. Therefore, by using the alarm function of the radiation measuring apparatus 10, it is possible to warn the worker about the ambient dose rate and the location (or direction) where there is an abnormality and the urgency of the abnormality.

  Although the present embodiment has been described, the described content is presented as an example, and is not intended to limit the scope of the invention. In the implementation stage, the present invention can be implemented in various forms other than the above-described embodiments.

  The radiation measuring apparatus 10 (FIG. 1) described above includes, for example, a moving unit 70 that moves the radiation dose detector 30, but further includes a moving unit that moves the radiation intensity detector 20 and the layout information detector 40. It is good also as a provided structure.

  In addition, the radiation measurement apparatus 10 described above includes, for example, an image generation unit 53 as an image generation unit, a simulation unit 54 as a simulation unit, a surface dose rate measurement unit 55 as a surface dose rate measurement unit, and a radiation intensity distribution. An intensity distribution update unit 56 as an update unit and an alarm unit 57 as an alarm unit are provided. The radiation measurement apparatus 10 includes a simulation unit 54, a surface dose rate measurement unit 55, an intensity distribution update unit 56, and an alarm. Part or all of the part 57 may be omitted.

  The present invention can be variously omitted, added, replaced, and changed without departing from the gist of the invention. These embodiments and modifications thereof are included in the scope and gist of the invention, and are included in the invention described in the claims and the equivalents thereof.

  DESCRIPTION OF SYMBOLS 1 ... Radiation measuring device, 3 ... Radiation management area, 4 ... Pool, 5 ... High radioactive substance, 6 ... Worker, 7 ... Shielding material, 20 ... Radiation intensity distribution detector (radiation intensity distribution detection means), 21 ... Radiation Intensity distribution detection unit, 22 ... angle adjustment unit, 23 ... transmission unit, 24 ... image processing unit, 25 ... display unit, 26 ... storage unit, 27 ... control unit, 30 ... radiation dose detector (radiation dose detection means), DESCRIPTION OF SYMBOLS 31 ... Radiation dose rate detection part, 32 ... Transmission part, 33 ... Memory | storage part, 34 ... Control part, 40 ... Layout information detector (layout information detection means), 41 ... Layout information detection part, 42 ... Input part, 43 ... Transmission unit, 44 ... storage unit, 45 ... control unit, 50 ... measurement computer, 51a ... input unit, 51b ... output unit, 52 ... transmission unit, 53 ... image generation unit (image generation means), 54 ... simulation unit (simulation) means) 55 ... Surface dose rate measurement unit (surface dose rate measurement unit), 56 ... Intensity distribution update unit (radiation intensity distribution update unit), 57 ... Alarm unit (alarm unit), 58 ... Storage unit (storage unit), 59 ... Control , 60 ... relay computer, 61 ... transmission unit, 62 ... control unit, 70 ... moving means, 81 ... shielding material DB, 82 ... post-shielding atmosphere dose rate calculation information, 83 ... surface dose rate calculation information.

Claims (10)

A radiation intensity distribution detecting means for acquiring a radiation intensity distribution in the target space at a desired azimuth angle and elevation angle;
A radiation dose detection means for detecting a radiation dose rate in the target space;
Radiation intensity distribution covering all directions centered on the one point obtained by using a plurality of different radiation intensity distributions acquired by the radiation intensity distribution detecting means at one point in the target space, the radiation dose detecting means The image showing the layout of the target space covers all directions based on the measured radiation dose rate, the layout information of the target space, and the position information of the radiation intensity distribution detection means and the radiation dose detection means. A radiation measurement apparatus comprising: an image generation unit configured to generate an image in which a radiation intensity distribution to be performed, a point where the radiation dose detection unit is disposed, and a radiation dose rate at the point are superimposed. Information on the position of the shielding material arranged in the target space to shield the radiation, a database of radiation transmittance for each type and thickness of the shielding material, the radiation dose after shielding by the shielding material, and the Using the relationship between the radiation transmittance of the shielding material and the radiation dose before shielding, the radiation dose rate and the total radiation dose before shielding, and the relationship between the radiation dose rate and the total radiation dose after shielding, The radiation measuring apparatus according to claim 1, further comprising a simulation unit that calculates a change in the radiation dose rate at a position where the radiation dose intensity distribution and the radiation dose rate are measured by a shielding material. The radiation measuring apparatus according to claim 1, further comprising a moving unit that moves the radiation dose detecting unit. The radiation measurement apparatus according to any one of claims 1 to 3, wherein the radiation dose detection means is disposed at least at two different points in a space in which the radiation is measured. The surface dose rate detected by the radiation detection means, the radiation dose flying to the one point in the target space from the position where the radiation detection means measured by the radiation intensity distribution detection means is disposed, and the radiation intensity distribution The amount of radiation flying to the one point in the target space from a position different from the position where the radiation detecting means is measured by the detecting means, from the one point in the target space determined from the layout information Surface dose rate measuring means for obtaining a surface dose rate at the different position based on the distance to the position where the radiation detecting means is arranged and the distance from the one point to the different position determined from the layout information; The radiation measuring apparatus according to any one of claims 1 to 4, further comprising: When decontamination is carried out in the target space, the surface dose rate of the arrangement location obtained by the radiation detection means arranged in the region where the decontamination is carried out before the decontamination Based on the surface dose rate after the decontamination, the change rate of the surface dose rate is calculated, and based on the obtained change rate, the radiation intensity that updates the radiation intensity distribution after the decontamination The radiation measuring apparatus according to claim 1, further comprising a distribution updating unit. The radiation dose detection unit further includes a warning unit that detects a radiation dose rate of the atmosphere in which the radiation is measured and determines that a warning should be issued when a detection result exceeds a set threshold value. The radiation measuring apparatus according to any one of claims 1 to 6, wherein The image generation means includes an image showing a calculation result of the simulation means, an image showing a surface dose rate of the measurement setting location obtained by the surface dose rate measurement means, and the radiation intensity after the radiation intensity distribution update means is updated. 8. The apparatus according to claim 1, wherein at least one of an image indicating a distribution and an image indicating that an alarm has been issued is generated when the alarm means issues an alarm. The radiation measurement apparatus according to any one of the above. The layout information detecting means for acquiring the layout information of the target space is further provided, and the layout information detecting means is configured to be able to transmit the acquired layout information to the image generating means. The radiation measuring apparatus according to any one of 8. To obtain a radiation intensity distribution detecting means for obtaining a radiation intensity distribution in a target space at a desired azimuth angle and elevation angle, a radiation dose detecting means for detecting a radiation dose rate in the target space, and obtaining a measurement result of the radiation A radiation measurement method performed using a computer that performs the arithmetic processing of
The radiation intensity distribution detecting means obtains a plurality of different radiation intensity distributions by adjusting the azimuth angle and elevation angle at one point set in the target space, and is obtained using the acquired radiation intensity distribution. Obtaining a radiation intensity distribution covering all directions from one point as a central point;
The radiation dose detection means obtaining a radiation dose rate of the target space;
The image generation means provided in the computer is obtained in the step of obtaining the radiation intensity distribution covering all directions around the one point obtained in the step of obtaining the radiation intensity distribution and the radiation dose rate of the target space. Based on the spatial radiation dose rate, the spatial layout information of the target space, and the positional information of the radiation intensity distribution detection means and the radiation dose detection means, an image showing a layout of a space for measuring the radiation, And generating an image in which a radiation intensity distribution covering all directions and a position of the radiation dose detection means and the spatial radiation dose rate obtained by the radiation dose detection means are superimposed. Measurement method.