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CN107490805A - Radiation appliance and radiation checking system - Google Patents

Radiation appliance and radiation checking system Download PDF

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Publication number
CN107490805A
CN107490805A CN201710847531.8A CN201710847531A CN107490805A CN 107490805 A CN107490805 A CN 107490805A CN 201710847531 A CN201710847531 A CN 201710847531A CN 107490805 A CN107490805 A CN 107490805A
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China
Prior art keywords
radiation
flying spot
spot beam
detection
attenuation
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Inventor
闫雄
刘铮
高超
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Jun He Xinda Beijing Science And Technology Ltd
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Jun He Xinda Beijing Science And Technology Ltd
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Priority to CN201710847531.8A priority Critical patent/CN107490805A/en
Publication of CN107490805A publication Critical patent/CN107490805A/en
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    • GPHYSICS
    • G01MEASURING; TESTING
    • G01VGEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
    • G01V5/00Prospecting or detecting by the use of ionising radiation, e.g. of natural or induced radioactivity
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N23/00Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00
    • G01N23/02Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00 by transmitting the radiation through the material
    • G01N23/04Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00 by transmitting the radiation through the material and forming images of the material

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geophysics (AREA)
  • High Energy & Nuclear Physics (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Biochemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Measurement Of Radiation (AREA)

Abstract

The invention discloses a kind of radiation appliance and radiation checking system, including scanning means and attenuating device.Scanning means is used to launch flying spot beam to detection zone.Attenuating device has multiple-working mode, the intensity of the flying spot beam for the different piece that attenuating device is launched scanning means under different working modes decays, to cause the flying spot beam after decay incides the absorbed dose rate of the corresponding site on the object to be detected in detection zone to be less than predetermined threshold value.Thus, ensureing that detection evades part not in the case of by high-level radiation, do not influenceing the normal detection for evading part to the non-detection on object to be detected also.

Description

Radiation appliance and radiation checking system
Technical field
The present invention relates to radiation detection arts, more particularly to a kind of radiation appliance and radiation checking system.
Background technology
Vehicle inspection system based on radiation detection imaging technique is widely used in the logistics such as customs, airport, harbour, station The national important place such as place and municipal building.Application purpose is also progressively looked into from the danger of searching for dangerous goods of van container vehicle, smuggled Check, be expanded to the anti-terrorism safety check of middle-size and small-size passenger vehicle or even human body.Wherein, to the safety check system of passenger vehicle, divide For dragging conveying scan mode and it is driving through scan mode.
In the case where vehicle conveys scan pattern, when examined vehicle reaches ad-hoc location, driver and passenger need to get off, and take charge of Machine need to carry out before getting off many more manipulations (e.g., steering wheel for vehicle beat just, extension neutral, RELEASE PARKINGBRAKE, some cars can't stop working), Then by conveying device by vehicle to be scanned from scan channel entrance while be transported to outlet while, when being scanned through region, vehicle quilt When being delivered to particular detection position, control system control radiographic source sends ray scanning vehicle.It can be seen that dragging conveying radiation scanning Pattern, the dragging induction system of complexity need to be arranged, floor space is big, and speed is limited, checks that efficiency is low, and equipment is complicated, cost is high, Induction system fault rate is high, maintenance difficulties are big, is not easy transition use.
On the other hand, surge and safety check pressure in face of the rapid growth of various countries' passenger vehicle, the vehicle flowrate of each application places Power increased dramatically, and if continuing to get off using the driver and personnel that are examined vehicle, enter pedestrian by actuator transport vehicles The pattern of car separation scanning, has a strong impact on safety check efficiency, and can bring opportunity to terrorist.
Therefore, the scan mode for being driving through formula is increasingly becoming the first choice of field of vehicle detection.At present, for being driving through Goods/vehicle inspection system of formula, be nearly all by the way of switching workload or close rate respectively to driver's cabin and Container part is scanned.When sensor detects that vehicle headstock part enters scanning area ad-hoc location, control system control The ray scanning headstock of radiographic source transmitting low dose rate processed, when sensor detects that container part enters scanning area ad-hoc location When, the ray scanning vehicular container part of control system control radiographic source transmitting high dose rate.
Although this mode can meet detection demand to a certain extent, multi-energy or multi-agent dose rate are needed to use Radiographic source, or using multiray source, complexity and cost are higher.Also, when being scanned using low dose rate pattern, Easily cause the missing inspection of the non-personnel area in vehicle.For example, driver's cabin generally comprises main driving room and copilot room, only In the case that main driving room has personnel, when driver's cabin passes through detection zone, because what is now scanned is low dose rate Ray, it is impossible to the accurate detection of the copilot room to no personnel area is realized, so as to produce missing inspection.Further, even if making The scanning for being driving through formula vehicle is realized with the mode of switching energy state, the radiation that passengers inside the car absorb can not be fully ensured that Amount is in safe range.
Therefore, it is necessary to a kind of radiation scanning scheme of highly effective and safe, to solve at least one of above-mentioned problem.
The content of the invention
It is a primary object of the present invention to provide the radiation appliance and radiation checking system of a kind of highly effective and safe, it can be On the premise of not influenceing the normal detection to the part to be detected of object to be detected, ensure that part is evaded in the detection of object to be detected Radiation absorbed dose remain at low levels.
According to an aspect of the invention, there is provided a kind of radiation appliance, including:Scanning means, for detection zone Launch flying spot beam;And attenuating device, there is multiple-working mode, attenuating device is to scanning means under different working modes The intensity of the flying spot beam of the different piece of transmitting is decayed, to cause the flying spot beam after decay to incide inspection The absorbed dose rate for the corresponding site on object to be detected surveyed in region is less than predetermined threshold value.
Preferably, scanning means can include:Radiation source, for divergent-ray beam;Collimater, line seam is which is provided with, The beam of radiation emission forms the flying spot beam launched to detection zone after line stitches.
Preferably, attenuating device includes multiple attenuation units, and multiple attenuation units correspond respectively to the different portions of line seam Position, the intensity that each attenuation units are used for the flying spot beam to stitching outgoing from the line at its corresponding position decay.
Preferably, each attenuation units can include:Attenuation block;And drive device, for driving attenuation block to block it The line seam at corresponding position, is decayed with the intensity to the flying spot beam for stitching outgoing from the line at the position, and/or Person, line seam of the driving attenuation block away from its corresponding position, to cause the line from the position to stitch the flying spot beam of outgoing Detection zone can be incident normally to.
Preferably, attenuation block is more than or waited perpendicular to from the width on the direction of propagation of the flying spot beam of line seam outgoing In the slit width of the line seam corresponding to it.
Preferably, the thickness on the direction of propagation of the attenuation block along the flying spot beam that outgoing is stitched from line is arranged to, So that the intensity for the flying spot beam being emitted from the line seam at its corresponding position incides after the attenuation of attenuation block The absorbed dose rate of the corresponding site on object to be detected in detection zone is less than predetermined threshold value, and/or attenuation block edge The distance between thickness of the length based on attenuation block, attenuation block and radiation source on the direction of line seam and attenuation block institute is right The angle of radiation for the flying spot beam answered determines.
Preferably, scanning means can also include:Screening arrangement, for the non-directive detection zone to radiation emission Beam is shielded;And/or switching device, the screening of the beam of the directive detection zone for controlling radiation emission Gear state.
According to another aspect of the present invention, a kind of radiation checking system is additionally provided, for leading to along radiation monitoring Road limit direct of travel advance object to be detected carry out radiation monitoring, wherein, object to be detected include need detection part and Part is evaded in detection, and the radiation checking system includes:The radiation appliance addressed above, the radiation being arranged in radiation monitoring passage Opening position is checked, for launching flying spot beam to detection zone;One or more detectors, it is arranged in radiation monitoring passage Precalculated position, for receive from detection zone object to be detected transmission or scattering imaging ray beam;And control dress Put, for controlling the detection corresponding to object to be detected that attenuating device is launched scanning means to evade the flying spot beam of part Intensity decayed, to cause the absorbed dose rate of part is evaded in detection to be less than predetermined threshold value.
Preferably, radiation appliance is arranged on the top of radiation monitoring passage, and one or more detectors are arranged on radiation inspection Bottom and/or the sidepiece of passage are looked into, or, radiation appliance is arranged on the bottom of radiation monitoring passage, one or more detectors Be arranged on top and/or the sidepiece of radiation monitoring passage, or radiation appliance is arranged on the side of radiation monitoring passage, one or Multiple detectors are arranged on top and/or bottom and/or the sidepiece of radiation monitoring passage.
Preferably, the test surface of one or more of detectors is substantially perpendicular to the direction of propagation of flying spot beam, And/or unidirectional center line is substantially belonged to substantially at one on the test surface of one or more of detectors In plane.
The radiation appliance and radiation checking system of the present invention, is not that radiographic source is transformed in itself, but to penetrating It is used for the detection to object to be detected in the flying spot beam that line source is sent and evades the targeted scans beam detected part Intensity decayed, to cause the absorbed dose rate of part is evaded in detection to be less than predetermined threshold value.Because the present invention be directed to penetrate What the intensity that partial scan beam corresponding to part is evaded in the flying spot Shu Zhongyu detections that line source is sent was decayed, therefore Ensureing that detection evades part not in the case of by high-level radiation, do not influenceing also to evade portion to the non-detection on object to be detected The normal detection divided.
Brief description of the drawings
Disclosure illustrative embodiments are described in more detail in conjunction with the accompanying drawings, the disclosure above-mentioned and its Its purpose, feature and advantage will be apparent, wherein, in disclosure illustrative embodiments, identical reference number Typically represent same parts.
Fig. 1 is the schematic block diagram for the structure for showing radiation appliance according to an embodiment of the invention.
Fig. 2 is the structural representation for showing radiation appliance according to another embodiment of the present invention.
Fig. 3 A- Fig. 3 C are to show schematic diagram of the attenuating device under different working condition under one embodiment of the invention.
Fig. 4 A- Fig. 4 C are several feasible laying schematic diagrams for showing the radiation appliance of the present invention.
Fig. 5, Fig. 6 are the structural representations for showing single attenuation units.
Fig. 7 A- Fig. 7 D are to show signal of the attenuating device under different working condition under another embodiment of the present invention Figure.
Fig. 8 is the schematic block diagram of the structure for the radiation checking system for showing one embodiment of the invention.
Fig. 9 is the structural representation for showing the radiation checking system under a specific embodiment of the invention.
Embodiment
The preferred embodiment of the disclosure is more fully described below with reference to accompanying drawings.Although the disclosure is shown in accompanying drawing Preferred embodiment, however, it is to be appreciated that may be realized in various forms the disclosure without the embodiment party that should be illustrated here Formula is limited.On the contrary, these embodiments are provided so that the disclosure is more thorough and complete, and can be by the disclosure Scope is intactly communicated to those skilled in the art.
When carrying out radiation scanning by the vehicle of formula to driver driving, it is necessary to driver's cabin and other personnel regions (such as copilot, back row seat) carries out evading detection.Existing detection mode is using switching workload or dosage mostly Rate scheme.When the personnel area of vehicle passes through detection zone, the ray of control radiographic source transmitting low dose rate is scanned, when When the container part of vehicle enters detection zone, the ray scanning vehicular container part of control radiographic source transmitting high dose rate.This Although kind of a mode can meet detection demand to a certain extent, the radiographic source of multi-energy or multi-agent dose rate is needed to use, Or using multiray source, complexity and cost are higher.Also, when being scanned using low dose rate pattern, it is easy to make Into the missing inspection of the non-personnel area in vehicle.For example, driver's cabin generally comprises main driving room and copilot room, in only main driving room In the case of with personnel, when driver's cabin passes through detection zone, due to now scan be low dose rate ray, it is impossible to The normal detection of the copilot room to no personnel area is realized, so as to produce missing inspection.
In view of this, the present invention proposes a kind of new irradiation protocol.The irradiation protocol of the present invention is not to radiographic source Itself is transformed, but part progress is evaded in the detection being used in the flying spot beam sent to radiographic source to object to be detected The intensity of the targeted scans beam of detection is decayed, to cause the absorbed dose rate of part is evaded in detection to be less than default threshold Value.Wherein, predetermined threshold value can be the safety value set according to actual conditions, and absorbed dose rate is used for after weighing object raying Energy absorption situation, it can refer to the absorbed dose of radiation in unit interval during object raying.For the present invention, absorbent Dose rate can also use single absorbed dose of radiation to characterize, and absorbed dose of radiation refers to the energy that radiation is absorbed after unit mass material raying, Single absorbed dose of radiation is the energy of radiation of the unit mass object absorbed in single irradiation detection process.
, can be according on object to be detected when the irradiation protocol using the present invention carries out radiation monitoring to object to be detected Detection evade part Regional Distribution of Registered in the detection area, determine the flying spot beam that radiographic source is sent to detection zone In with detection evade the corresponding targeted scans beam in part.Then when detection evades part and passes through detection zone, by right The intensity of targeted scans beam is decayed, it is possible to so that detection evade part absorbed dose rate be in one it is relatively low Number range.Because partial scan corresponding to part is evaded in the flying spot Shu Zhongyu detections sent the present invention be directed to radiographic source What the intensity of beam was decayed, therefore ensureing that detection evades part not in the case of by high-level radiation, do not influence also Evade the normal detection of part to the non-detection on object to be detected.
It should be noted that when carrying out radiation monitoring to object to be detected, part is evaded in the detection of object to be detected Single absorbed dose of radiation evades the radiation intensity positive correlation of radiated time and radiation source of the part Jing Guo radiation detection with detection.This hair Bright irradiation protocol can be declined by evading the intensity of the corresponding flying spot beam in part to radiation emission and detection Subtract, evade the radiation intensity being partially received to reduce detection, so that the single absorbed dose of radiation that part is evaded in detection is less than Predetermined threshold value.Wherein, to the specific attenuation degree of flying spot Shu Jinhang decay can according to the setting of predetermined threshold value, be detected The determination of many kinds of parameters such as the distance between actual travel speed, radiation parameter, radiation source and object to be detected of object, herein not Repeat again.
Based on above-mentioned design, the present invention proposes a kind of new radiation appliance and the radiation monitoring including the radiation appliance System.Wherein, radiation appliance is mainly used in providing the flying spot beam of radiation detection, and radiation checking system is used for being detected Object carries out radiation monitoring.With reference to specific embodiment, just the radiation appliance of the present invention and the structure of radiation checking system are done Describe in detail.
Fig. 1 is the schematic block diagram of the structure for the radiation appliance for showing one embodiment of the invention.As shown in figure 1, this The radiation appliance 100 of invention includes scanning means 110 and attenuating device 120.
Scanning means 110 is used to launch flying spot beam to detection zone.Detection zone is to carry out spoke to object to be detected Penetrate the region of inspection, detection zone can be that the flying spot beam launched by scanning means 110 is propagated formed in space Region.In the precalculated position (top, bottom or the sidepiece of such as passage) being arranged on scanning means 110 in radiation monitoring passage, When object to be detected (such as vehicle) for being advanced to the direct of travel limited along radiation monitoring passage is scanned, scanning dress It is preferably vertical with the direct of travel of object to be detected to put the flying spot beam of 110 transmittings, now detection zone is with being detected The vertical face region of the direct of travel of object.
Scanning means 110 can be the scanning means of existing conventional configurations.For example, scanning means 110 can include spoke Penetrate source and collimater.Radiation source can use 160kV~450kV X-ray tube, can be formed around it using lead or tungsten material Screening arrangement shields to the useless beam of non-directive detection zone.Wherein, screening arrangement can be designed to labyrinth shape, To improve shield effectiveness.Windowing can be provided with screening arrangement, the beam of radiation emission can incide standard by windowing Straight device.
Collimater can be arranged in the radiation direction of radiation source, and collimater is stitched provided with line, and collimater can pass through The X-ray beam of line seam about radiation source beam radiation is (tested in the subtended angle of short transverse (vertical with scanning direction) and scanning direction Survey object the direction of motion) on width.The beam of radiation emission acts on being formed to detection zone by the line of line seam The flying spot beam of domain transmitting.
Attenuating device 120 has multiple-working mode.Attenuating device 120 can be to scanning means under different working modes The intensity of the flying spot beam of the different piece of 110 transmittings is decayed, make it that the flying spot beam after decay is incident The absorbed dose rate of the corresponding site on object to be detected into detection zone is less than predetermined threshold value.Wherein, corresponding site is excellent Selection of land is that part is evaded in the detection on object to be detected.So that object to be detected is vehicle as an example, corresponding site can be on vehicle Such as main driving, copilot with personnel, back seat region.Absorbed dose rate may refer to be described above, here no longer Repeat.
Thus, when during the detection of object to be detected evades part by detection zone, attenuating device 120 can control it Mode of operation, make it that it is right that part is evaded in the flying spot Shu Zhongyu detections only launched under the mode of operation scanning means 110 The targeted scans beam answered is decayed.So ensureing that detection evades part not in the case of by high-level radiation, also not Influence the normal detection for evading part to the non-detection on object to be detected.
It should be noted that in object to be detected there are multiple detections to evade part, and part warp is evaded in this multiple detection When crossing detection zone, when corresponding to the flying spot beam of different piece, attenuating device 120 can be in multiple detections of object to be detected Evade part one by one by during detection zone, controlling its mode of operation in real time, to realize to the inspection Jing Guo detection zone Gauge keeps away the decay of the flying spot beam corresponding to part.Driven using object to be detected as 5 left sides, operator seat is sat on car to be had Driver, exemplified by heel row middle seat has passenger, when driver's cabin passes through detection zone, the work of attenuating device 120 can be controlled Operation mode so that the flying spot Shu Jinhang decay corresponding with left-hand drive room of 120 pairs of attenuating device, pass through detection in back row seat During region, the mode of operation of attenuating device 120 can be switched, control attenuating device 120 corresponding to heel row middle seat for sweeping Beam is retouched to be decayed.
So far Fig. 1 is combined with regard to the basic structure of the radiation appliance of the present invention and using radiation appliance of the invention to tested The basic process for surveying object progress radiation monitoring briefly explains.Understood according to described above, the present invention is mainly by declining Subtract the decay that device realizes the flying spot beam for the different piece launched radiation appliance, below with regard to the operation principle of attenuating device And concrete structure is described further.
Intensity can be reduced after ray passes through material, and this phenomenon is referred to as decaying.Different metal material (such as aluminium, iron, Copper, lead, alloy etc.) to the attenuation coefficient difference of ray.The attenuating device of the present invention can be with stronger by one or more Ray attenuation ability material composition, such as aluminium, iron, copper, lead, alloy etc..
Attenuating device can realize the decay to strafing wire harness by blocking flying spot beam.The attenuating device of the present invention There can be a multiple-working mode, attenuating device can be launched the scanning means in radiation imaging apparatus under different working modes Flying spot beam in the intensity of flying spot beam of different piece decayed.In other words, attenuating device can be to scanning The flying spot Shu Jinhang of different piece is blocked in the flying spot beam of device transmitting, to realize the flying spot to different piece The decay of beam.
Fig. 2 is the structural representation for showing the radiation appliance according to a specific embodiment of the invention.
In the present embodiment, scanning means can include radiation source 113, screening arrangement 111, switching device 117 and standard Straight device 115.
Radiation source 113 is used for divergent-ray beam.Screening arrangement 111 can be designed to labyrinth form, be enclosed in radiation source 113 Surrounding, screening arrangement 111 can leave window at the position of the corresponding divergent-ray of radiation source 113.The ray that radiation source 113 is launched Beam can go out be shot out by window.
Switching device 117 can be made up of the stronger material such as lead, tungsten of one or more ray attenuation abilities.Switching device 117 can be used for the occlusion state of the beam for the directive detection zone for controlling radiation source 113 to launch.Switching device 117 is closed When can stop Radiolucent completely to detection zone, when switching device 117 is opened, any useful ray emission can not be stopped To detection zone.Wherein, switching device 117 can be blocked by the window reserved to screening arrangement 111 or do not blocked, and be controlled The occlusion state for the beam that radiation source 113 processed is launched.
Collimater 115 is stitched provided with line, and the beam that radiation source 113 is launched can be formed after line stitches to detection The flying spot beam of field emission.
Attenuating device 120 can be by decaying, with shape to the flying spot Shu Jinhang that outgoing is stitched from the line of different parts Into multiple-working mode.For example, attenuating device can be stitched by blocking the line of different parts, realize to being emitted from corresponding site Flying spot beam decay.Wherein, attenuating device 120 is when the intensity of the flying spot beam to appropriate section decays, It can be decayed with complete attenuation or part, as long as so that going out the detected material at position corresponding to flying spot beam after decay The absorbed dose rate of body is less than predetermined threshold value.
In theory, it is likely to and object to be detected from all flying spot beams of the line seam outgoing of collimater 115 It is corresponding that part is evaded in detection.It is therefore preferred that attenuating device 120 should be configured to from line seam outgoing whole or Most flying spot Shu Jinhang decay.
In the present embodiment, attenuating device 120 can be made up of multiple attenuation units.Multiple attenuation units can be right respectively Should can be separate structure between the different parts of line seam, multiple attenuation units, each attenuation units can lead to The line seam for blocking its corresponding position is crossed, realizes the decay of the flying spot beam to the line seam outgoing from the position.Thus, By controlling different attenuation units to participate in work, you can form different mode of operations.
As shown in Figure 3A, attenuating device can be made up of 11 attenuation units S1-S11, and this 11 attenuation units can be tight Solid matter arranges, and each attenuation units correspond to a part of line seam 1151.Its corresponding portion can be blocked by mobile attenuation units The line seam 1151 divided, realize the decay of the intensity for the flying spot beam being emitted to the line seam from its corresponding part.Such as figure Shown in 3B, the line seam 1151 at its corresponding position can be blocked by mobile attenuation units S7, S8, to what is be emitted from the position The intensity of flying spot beam is decayed.As shown in Figure 3 C, another part beam can also be blocked by mobile attenuation units S3-S6 Stream seam 1151, realize the decay to the flying spot beam from the seam outgoing of another part line.
As described above, attenuating device 120 should preferably be configured to from line seam 1151 outgoing wholes or Most flying spot Shu Jinhang decay.Therefore, the multiple attenuation units for forming attenuating device 120 can be correspondingly whole or big Part line seam 1151.As the alternative embodiment of the present invention, forming multiple attenuation units of attenuating device can correspond to 1151 are stitched in part line, and the multiple attenuation units of person can do integral translation along the direction of line seam 1151, to cause The flying spot Shu Jinhang that attenuating device can stitch outgoing to whole or most line decays.
When attenuating device 120 is made up of multiple attenuation units, the length of the line seam 1151 corresponding to single attenuation units Degree can be considered as control accuracy of the attenuating device 120 to flying spot beam.Specifically, in radiation source 113 and attenuating device 120 The distance between it is certain in the case of, the length of the line seam 1151 corresponding to single attenuation units is shorter, single attenuation units The radiation angle of corresponding flying spot beam is smaller, and the control accuracy of attenuating device 120 is higher.In actual applications, composition declines Subtract the attenuation units of device 120 number and each attenuation units corresponding to line seam 1151 length can be according to reality Border demand setting, here is omitted.
It should be noted that Fig. 2 is to show that attenuating device 120 and collimater 115 are list structure, radiation source 113 Be arranged on decay 120 and collimater 115 top when schematic diagram.It should be understood that attenuating device 120 and collimater 115 are also Can be other various shapes, and radiation source 113 can also have other a variety of set-up modes.For example, shown in Fig. 4 A, radiation source 113 can be arranged at the top of attenuating device 120 and collimater 115, and attenuating device 120 and collimater 115 can be designed to arc The structure of shape.As shown in Figure 4 B, radiation source 113 can be arranged at the lower section of attenuating device 120 and collimater 115, decay dress Put 120 and collimater 115 be also designed to the structure of arc shape.As shown in Figure 4 C, radiation source 113 can be arranged at radiation inspection The sidepiece of passage is surveyed, attenuating device 120 and collimater 115 can design structure into strips.In addition, attenuating device 120 and standard Straight device 115 can also have other various shapes, repeat no more here.
Fig. 5 is to show a kind of structural representation that single attenuation units can have.As shown in figure 5, attenuation units can With including attenuation block 1212 and drive device 1211.
Attenuation block 1212 can be made up of one or more of materials with stronger ray attenuation ability, for example, aluminium, iron, Copper, lead, alloy etc..Drive device 1211 is used for the line seam 1151 for driving attenuation block 1212 to block its corresponding position, with right Decayed from the intensity of the flying spot beam of the outgoing of line seam 1151 at the position, and attenuation block 1212 can also be driven remote The line seam 1151 at position corresponding from its, to enable the flying spot beam of the outgoing of line seam 1151 from the position normal Incide detection zone.Drive device 1211 can be a variety of actuating units such as stretching structure, push-pull mechanism.For example, driving dress It can be high-speed electro-magnet to put 1211.
The size of attenuation block 1212 can be set according to actual conditions.As shown in fig. 6, in general, attenuation block 1212 is hung down It should be directly set greater than or equal to corresponding to it in from the width w on the direction of propagation of the flying spot beam of the outgoing of line seam 1151 Line seam 1151 slit width, with enable attenuation block 1212 block its corresponding position line seam 1151.Such as width w It could be arranged to the maximum slit width for being more than line seam 1151.
Attenuation block 1212 should be set along from the thickness on the direction of propagation of the flying spot beam of the outgoing of line seam 1151 For so that decay of the intensity for the flying spot beam being emitted from the line seam 1151 at its corresponding position Jing Guo attenuation block 1212 is made With rear, the absorbed dose rate for inciding the corresponding site on the object to be detected in detection zone is less than predetermined threshold value.Wherein, decline Subtracting the thickness of block 1212 can determine according to the material of attenuation block 1212 and the particularly relevant parameter of system.
As those skilled in the known, irradiated, inhaled by beam (such as X ray) in the object at target spot R Receive dosage can approximation be calculated as follows:
D=fX0·I·t·(R0/R)2
In formula, f is absorbed dose change coefficient (dagger-axe/human relations), X0It is R for off-target point0Ray amount of exports (the human relations/milliampere at place Point), I is tube current (milliampere), and t is by according to time (dividing), R0To find narrow beam amount of exports X on the diagram0When, the distance of off-target point (centimetre), R are the actual distance (centimetre) by according to point off-target point.
As can be seen from the above equation, if in the case where radiation source parameter is certain, special bit on passengers inside the car or car is reduced The single absorbed dose of radiation of received beam is put, one of which method is the speed that raising is scanned vehicle or personnel pass through, To reduce by the radiation exposure time, wherein another method is to increase metal filtration, a side between radiographic source scanned The low energy ray useless to scanning probe picture quality is filtered in face, the intensity of another aspect attenuation ray, will irradiate vehicle crew The single absorbed dose of radiation in region drops to low-down rank.Improve scanned vehicle or personnel by speed, can be in certain journey Influenceed on degree to the accuracy of detection of the normal detection part of vehicle, therefore degree of the taking radiographic source of the invention mode that is decayed drops The single absorbed dose of radiation of specific position on low passengers inside the car or car.
Intensity can be reduced after ray passes through material, and this is referred to as decaying, different metal material (such as aluminium, iron, copper, lead, conjunction Gold etc.) to the attenuation coefficient difference of X ray.The physical quantity of description ray attenuation property is referred to as attenuation rate, and its calculation formula is:Jd =J0·e-ud.In formula, JdStrong, the J after material is passed through for ray0Intensity during material is not passed through for ray, u is ray attenuation system Number, after representing that ray penetrates unit length material, the attenuation degree of intensity, d is the thickness of material.
In radiation checking system, the single absorbed dose of radiation of object to be detected is substantially from useful beam, according to tool The demand of body single absorbed dose of radiation limit value, it is determined that attenuation block material and detecting system following several respects technical parameter it Afterwards, the thickness of attenuation block can just be calculated.The technical parameter of described several respects is:Roentgen dose X rate at 1 meter of radiographic source (μ Sv ﹒ m2﹒ h-1), detection evades part and evades the corresponding flying spot beam in part with the distance between radiation source (m), with detection Incide detection and evade relative moving speed (m/s) between beam width on part, object to be detected and radiation source.
As shown in fig. 6, the length on the direction that attenuation block 1212 is stitched along line can be based on attenuation block and radiation source 113 The distance between and attenuation block 1212 corresponding to flying spot beam angle of radiation β determine.Wherein, angle of radiation β can be with It is considered as the control accuracy of attenuating device, angle of radiation β is smaller, and the control accuracy of attenuating device 120 is higher.
Fig. 7 A to Fig. 7 D are the structural representations for showing the attenuating device under another embodiment of the present invention.Wherein, Fig. 7 A For front view, Fig. 7 D are side view, and Fig. 7 B are vertical view state schematic diagram when no attenuation block is blocked, Fig. 7 C be attenuation block S6, S8 is pushed out vertical view state schematic diagram when participating in work.
As shown in Fig. 7 A- Fig. 7 C, attenuating device can be made up of 13 attenuation units S1-S13.Wherein, each decay is single Member includes high speed load push-pull 1051 (preferably high-speed electro-magnet), attenuation block 1052, locating rod 1053, push rod 1054.Decay Block 1052 installs on the securing lever 1053.Locating rod 1053 is connected with the end of push rod 1054.Push rod 1054 is high speed load push-pull 1051 moving component.
Each attenuation units self contained function, push rod 1054 can promote the quick-expansion of attenuation block 1052 under controller instruction, The ray of corresponding part is decayed when attenuation block 1052 is stretched out, attenuation block 1052 cancels ray attenuation when retracting.Each decline 20ms (preferably no more than 10ms) can be not more than by subtracting the action executing time of high speed load push-pull 1051 of unit, push rod 1054 Stroke can be not less than 3mm (preferably 20mm).During radiation monitoring is carried out to object to be detected (such as vehicle), Area distribution of the part in radiation monitoring passage can be evaded according to the detection of acquired object to be detected by control system Information, it is determined that participating in the attenuation units of work, and send the related attenuation units of order control and perform action, the decay being pushed out Block weakens or the transmitted intensity of shielding respective regions, detection to evade part to carry out single during into respective block to absorb Dosage is limited in extremely low number range.
Fig. 7 D are side schematic view, and as illustrated in fig. 7d, collimater 115 and attenuating device 120 can be installed within mounting bracket On 1041.Scanning means can also include switching device 117, and switching device 117 is used to control radiation source 113 to send out to detection zone The occlusion state for the beam penetrated.Switching device 117 can be by having the radiation shielding material of extremely strong damping capacity to ray It is made, such as lead, tungsten.Switching device 117 can be by quick tight shut-off or opening ray window, quickly to beat on and off Close the beam of the guiding detection zone of the transmitting of radiation source 113.Wherein, switching device 117 can completely stop penetrate when closed Line is passed through to security sweep region, during opening, does not stop that any useful beam is launched to detection zone.
So far, the structure of the radiation appliance of the present invention is described in detail, radiation appliance of the invention can apply to radiate Inspection system, to provide the flying spot beam that radiant image is carried out to object to be detected.Fig. 8 is shown according to the present invention one The schematic block diagram of the structure of the radiation checking system of embodiment.
Referring to Fig. 8, radiation checking system 80 includes radiation appliance 100, one or more detectors 810 and control device 820。
Radiation appliance 100 can be arranged on the radiation monitoring opening position in radiation monitoring passage, for being sent out to detection zone Flying spot beam is penetrated, wherein, the structure on radiation appliance 100 may refer to upper associated description, repeat no more here.Detector 810 are arranged on the precalculated position in radiation monitoring passage, for receiving from the object to be detected transmission or scattering in detection zone Imaging ray beam.Analyzed by the imaging ray Shu Jinhang received to detector 810, it is possible to obtain object to be detected Radiation image.
Radiation appliance 100 and detector 810 may be constructed transmission-type radiation imaging apparatus, can also form the radiation of scattering formula Imaging device, such as back-scatter radiation imaging device., the radiation different with the image-forming principle of detector 810 according to radiation appliance 100 The position relationship that device 100 and detector 810 are arranged in radiation monitoring passage is also not quite similar.
Specifically, the radiation imaging apparatus formed in radiation appliance 100 and detector 810 fills for transmission-type radiant image When putting, detector 810 can be separately positioned on the diverse location in radiation monitoring passage with radiation appliance 100.For example, radiation dress The top of radiation monitoring passage can be arranged on by putting 100, and for launching flying spot beam downwards, detector 810 can be arranged on The sidepiece of radiation monitoring passage and/or bottom;Radiation appliance 100 can be arranged on the bottom of radiation monitoring passage, for upward Launch flying spot beam, detector 810 can be arranged on sidepiece and/or the top of radiation monitoring passage;Radiation appliance 100 can be with The sidepiece of radiation monitoring passage is arranged on, for launching flying spot beam to opposite side, detector 810 can be arranged on radiation inspection Look into the top, bottom or opposite side of passage.In addition, radiation imaging apparatus be scattering formula imaging device such as back-scatter radiation into During as device, detector 810 and radiation appliance 100 can be positioned at the same sides of radiation monitoring passage.
Preferably, radiation checking system 80 can include multiple detectors, and multiple detections are set in radiation monitoring passage During device, the test surface of multiple detectors can be vertical and multiple with the direction of propagation of the flying spot beam of scanning means transmitting The center line of the test surface of detector can be substantially in a plane.Wherein, center line described herein refers in test surface Substantially belong to unidirectional center line.For example, the test surface of detector is rectangle mostly, and the center line of rectangle can wrap Include the center line of long side and cross the center line of short side, after the test surface fixation of multiple detectors, the test surface of multiple detectors In center line can be divided into center line generally in a horizontal direction and center line substantially in the vertical direction, multiple detectors The center line of test surface refers to that the center line of (horizontal and/or vertical) substantially in the same direction is basic substantially in a plane In a plane.
Control device 820 is used to control attenuating device to evade the detection corresponding to object to be detected that scanning means is launched The intensity of partial flying spot beam is decayed, to cause the absorbed dose rate of part is evaded in detection to be less than predetermined threshold value.
Specifically, control device 820 can evade the area distribution information of part according to the detection of object to be detected, really Regular inspection gauge keeps away the detection of part in the detection area and evades region., can so when detection evades part and passes through detection zone To control the attenuating device pair in radiation appliance 100 and detection is evaded the intensity of the corresponding flying spot beam in region and decayed, So that the absorbed dose rate that part is evaded in detection is less than predetermined threshold value.
Fig. 9 is to show that the structure when radiation checking system built using the present invention is detected to object to be detected is shown It is intended to.
Referring to Fig. 9, in the present embodiment, radiation appliance in radiation checking system can by shutter 102, radiographic source 101, Radiographic source screened room 103, ray collimator 104 and attenuating device 105 are formed.Wherein, can be with above radiation monitoring passage Installation frame 1000, the top of frame 1000 can set a nacelle, and radiation appliance can be arranged in the nacelle.
Frame 1000 can include left column frame and right column frame, vertical with chassis upper surface, their lower end point It is not connected with the right and left on chassis, their upper end is connected with the left and right both sides of crossbeam frame respectively, left column machine Frame, right column frame, crossbeam frame and chassis form the passage of hollow, pass through for scanned vehicle.
Detector 106 may be mounted in detector cavity 107, and the sensitive zone centerline of all detectors can be preferably On one face.Wherein, detector cavity 107 can be divided into the left spy for the inside for being fixed on left column frame and right column frame Survey device cavity, right detector cavity and the bottom detector cavity in chassis 1001.Left detector cavity, right detection Detector 106 can be provided with device cavity and bottom detector cavity.Detector cavity can carry out left and right, front and rear, liter Multiple frees degree such as drop, pitching, rotation are adjusted flexibly, in order to which the fan-ray beam after collimation can make the output of detector Reach maximum.
Radiation protection wall 108 can be divided into left radiation protection wall and right radiation protection wall, and connection respectively is arranged on left column The outside of support and right column support, to shield unnecessary ray.
As shown in figure 9, attenuating device 105 can include 13 filter unit S1-S13, it is by vehicle of object to be detected , only main driving position has personnel in vehicle, when vehicle cab passes through detection zone, can control in attenuating device 105 Respective attenuation unit pair part corresponding with main driving room flying spot Shu Jinhang decay.Declined as shown in figure 9, can control Attenuation units S8, S9 subtracted in device 105 participate in decay., can be to control attenuating device after driver's cabin is by detection zone Attenuation units S8, S9 in 105 stop decay.
It is described above various embodiments of the present invention, described above is exemplary, and non-exclusive, and It is not limited to disclosed each embodiment.In the case of without departing from the scope and spirit of illustrated each embodiment, for this skill Many modifications and changes will be apparent from for the those of ordinary skill in art field.The selection of term used herein, purport The principle of each embodiment, practical application or improvement to the technology in market are best being explained, or is making the art Other those of ordinary skill are understood that each embodiment disclosed herein.

Claims (10)

1. a kind of radiation appliance, including:
Scanning means, for launching flying spot beam to detection zone;And
Attenuating device, has a multiple-working mode, and the attenuating device is launched the scanning means under different working modes The intensity of the flying spot beam of different piece is decayed, to cause the flying spot beam after decay to incide the detection The absorbed dose rate of the corresponding site on object to be detected in region is less than predetermined threshold value.
2. radiation appliance according to claim 1, wherein, the scanning means includes:
Radiation source, for divergent-ray beam;
Collimater, which is provided with line seam, and the beam of the radiation emission is formed to the inspection after line seam Survey the flying spot beam of field emission.
3. radiation appliance according to claim 2, wherein, the attenuating device includes multiple attenuation units, the multiple Attenuation units correspond respectively to the different parts of line seam, and each attenuation units are used for from its corresponding position The intensity of the flying spot beam of line seam outgoing is decayed.
4. radiation appliance according to claim 3, wherein, each attenuation units include:
Attenuation block;And
Drive device, for driving the attenuation block to block the line seam at its corresponding position, with to the line seam from the position The intensity of the flying spot beam of outgoing is decayed, and/or, drive line of the attenuation block away from its corresponding position Seam, the detection zone is incident normally to enable the line from the position to stitch the flying spot beam of outgoing.
5. radiation appliance according to claim 4, wherein,
The attenuation block is more than or equal to perpendicular to from the width on the direction of propagation of the flying spot beam of line seam outgoing The slit width of line seam corresponding to it.
6. radiation appliance according to claim 4, wherein,
Thickness on the direction of propagation of the attenuation block along the flying spot beam that outgoing is stitched from the line is arranged to so that After attenuation of the intensity for the flying spot beam being emitted from the line seam at its corresponding position by the attenuation block, incide The absorbed dose rate of the corresponding site on object to be detected in the detection zone is less than predetermined threshold value, and/or
The length on direction that the attenuation block is stitched along the line based between the attenuation block and the radiation source away from From and the attenuation block corresponding to flying spot beam angle of radiation determine.
7. radiation appliance according to claim 2, wherein, the scanning means also includes:
Screening arrangement, the beam for detection zone described in the non-directive to the radiation emission shield;And/or Person
Switching device, for controlling the occlusion state of the beam of detection zone described in the directive of the radiation emission.
8. a kind of radiation checking system, the object to be detected for being advanced to the direct of travel limited along radiation monitoring passage enters Row radiation monitoring, wherein, the object to be detected includes needing detection part and detection to evade part, the radiation checking system bag Include:
Radiation appliance any one of claim 1-7, the radiation monitoring opening position being arranged in radiation monitoring passage, For launching the flying spot beam to detection zone;
One or more detectors, the precalculated position being arranged in the radiation monitoring passage, for receiving from the detection zone The imaging ray beam of object to be detected transmission or scattering in domain;And
Control device, for the inspection corresponding to the object to be detected for controlling the attenuating device to launch the scanning means The intensity that gauge keeps away the flying spot beam of part is decayed, to cause the absorbed dose rate for evading part that detects less than pre- If threshold value.
9. radiation checking system according to claim 8, wherein,
The radiation appliance is arranged on the top of the radiation monitoring passage, and one or more of detectors are arranged on the spoke The bottom for checking passage and/or sidepiece are penetrated, or,
The radiation appliance is arranged on the bottom of the radiation monitoring passage, and one or more of detectors are arranged on the spoke The top for checking passage and/or sidepiece are penetrated, or
The radiation appliance is arranged on the side of the radiation monitoring passage, and one or more of detectors are arranged on the spoke Penetrate the top for checking passage and/or bottom and/or sidepiece.
10. radiation checking system according to claim 9, wherein,
The test surface of one or more of detectors is substantially perpendicular to the direction of propagation of the flying spot beam, and/or Person,
Unidirectional center line is substantially belonged to substantially in a plane on the test surface of one or more of detectors.
CN201710847531.8A 2017-09-19 2017-09-19 Radiation appliance and radiation checking system Pending CN107490805A (en)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107664774A (en) * 2017-09-19 2018-02-06 北京君和信达科技有限公司 radiation checking system and method
EP3505976A1 (en) * 2017-12-27 2019-07-03 Tsinghua University Vehicle detection system
CN114527516A (en) * 2020-11-19 2022-05-24 同方威视技术股份有限公司 Multi-channel radiographic inspection apparatus
CN119738891A (en) * 2024-12-27 2025-04-01 同方威视技术股份有限公司 Flying spot forming device and scanning inspection system

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IL74614A0 (en) * 1984-03-16 1985-06-30 Optische Ind De Oude Delft Nv Apparatus for slit radiography comprising discrete,controllable attenuation elements coacting with a slit diaphragm
CN104101910A (en) * 2014-07-04 2014-10-15 清华大学 Distributed radiation source-based X-ray backscattering channel type vehicle security system and method
CN104374785A (en) * 2014-11-14 2015-02-25 北京君和信达科技有限公司 Continuous pass-type radiation scanning system and method
CN204314236U (en) * 2014-11-14 2015-05-06 北京君和信达科技有限公司 A kind of continuous radiation scanning system
CN106950232A (en) * 2017-04-12 2017-07-14 北京君和信达科技有限公司 Radiation testing method and radiation checking system
CN207263941U (en) * 2017-09-19 2018-04-20 北京君和信达科技有限公司 Radiation appliance and radiation checking system

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IL74614A0 (en) * 1984-03-16 1985-06-30 Optische Ind De Oude Delft Nv Apparatus for slit radiography comprising discrete,controllable attenuation elements coacting with a slit diaphragm
US4675893A (en) * 1984-03-16 1987-06-23 N.V. Optische Industrie "De Oude Delft" Apparatus for slit radiography
CN104101910A (en) * 2014-07-04 2014-10-15 清华大学 Distributed radiation source-based X-ray backscattering channel type vehicle security system and method
CN104374785A (en) * 2014-11-14 2015-02-25 北京君和信达科技有限公司 Continuous pass-type radiation scanning system and method
CN204314236U (en) * 2014-11-14 2015-05-06 北京君和信达科技有限公司 A kind of continuous radiation scanning system
CN106950232A (en) * 2017-04-12 2017-07-14 北京君和信达科技有限公司 Radiation testing method and radiation checking system
CN207263941U (en) * 2017-09-19 2018-04-20 北京君和信达科技有限公司 Radiation appliance and radiation checking system

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107664774A (en) * 2017-09-19 2018-02-06 北京君和信达科技有限公司 radiation checking system and method
EP3505976A1 (en) * 2017-12-27 2019-07-03 Tsinghua University Vehicle detection system
US10795050B2 (en) 2017-12-27 2020-10-06 Tsinghua University Vehicle detection system
CN114527516A (en) * 2020-11-19 2022-05-24 同方威视技术股份有限公司 Multi-channel radiographic inspection apparatus
CN114527516B (en) * 2020-11-19 2023-10-13 同方威视技术股份有限公司 Multi-channel radiographic inspection apparatus
CN119738891A (en) * 2024-12-27 2025-04-01 同方威视技术股份有限公司 Flying spot forming device and scanning inspection system

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