CN217133005U - Multi-mode Compton imaging detection device - Google Patents
Multi-mode Compton imaging detection device Download PDFInfo
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- CN217133005U CN217133005U CN202123128341.1U CN202123128341U CN217133005U CN 217133005 U CN217133005 U CN 217133005U CN 202123128341 U CN202123128341 U CN 202123128341U CN 217133005 U CN217133005 U CN 217133005U
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Abstract
The utility model provides a many modes's compton formation of image detection device, include: the device comprises a shell, a ray source, a scattering detector, an absorption detector, a visible light imaging unit, a signal processing unit, a central control panel, a power supply assembly and a display screen, wherein the ray source, the scattering detector, the absorption detector, the visible light imaging unit, the signal processing unit, the central control panel, the power supply assembly and the display screen are arranged in the shell; the multiple scattering detectors are arranged in an array form to form two scattering detector arrays; the multiple absorption detectors are arranged in an array form to form two absorption detector arrays; the visible light imaging unit is arranged on one side of the scattering detector; the signal processing unit is respectively connected with the scattering detector and the absorption detector; the central control board is connected with the signal processing unit and the visible light imaging unit; other elements of the power supply assembly provide power; the display screen is connected with the central control panel. The utility model provides a detection device can realize the detection of multiple mode, is applied to discriminating and positioning detection of organic contraband, radioactive nuclide, and convenient operation, portability are good, and detection device's totality input cost is low, resources are saved.
Description
Technical Field
The utility model belongs to the technical field of radiation imaging inspection, especially, relate to a multi-mode compton formation of image detection device.
Background
At present, ion mobility spectrometry, mass spectrometry and a combination technology thereof are mainly adopted internationally for detecting trace drugs and explosives, and radiation imaging technical means are mainly relied on for detecting a small amount of drugs and explosives. The drugs and the explosives are both composed of low atomic number elements (C, H, N, O, P and the like), the material density is low, the electron density is high, the absorption capacity to rays is poor, but the Compton scattering effect is strong, organic contraband articles such as the drugs and the explosives can be highlighted by utilizing the Compton backscatter imaging technology, and the layout of the backscatter detectors is flexible, so that the backscatter imaging technology is very suitable for imaging detection of organic contraband articles such as the drugs or the explosives with good interlayers and sealing performance, and is greatly equipped by customs frontier defense.
For the identification and detection of radioactive nuclides or substances, an energy spectrum of a target substance to be detected is measured by an energy spectrometer, and then the acquired characteristic energy spectrum is preprocessed, subjected to peak searching and matched to determine the nuclide type.
For the positioning of radioactive nuclides, the effective method mainly comprises three technologies of pinhole imaging, coded aperture imaging and compton scattering imaging, and because the compton scattering imaging technology does not need a collimator to limit the field of view, the compton scattering imaging technology is superior to other two technologies in portability and imaging view angle range, so that the imaging radioactive source positioning technology based on compton forward scattering is also widely adopted.
In the prior art, on the one hand, no technical report about a portable detection device and a related device which simultaneously have the functions of identifying and positioning the organic contraband such as drugs and explosives and the like and the radionuclide is found, in the prior art, compton backscattering imaging is adopted to realize the detection of the drugs, the explosives and other organic articles, an energy spectrometer is adopted to screen the radionuclide, and the compton forward scattering is adopted to realize the positioning of the radionuclide, so that the overall investment cost of the detection equipment is high and the resource is wasted.
On the other hand, the principle of the mainstream flying spot scanning technical scheme of compton scattering imaging is that a rotating disc with slits uniformly formed in a circle is added at the front end of a fan-shaped beam outlet of an X-ray machine, and a pen-shaped or flying spot-shaped ray beam is formed by crossing the slits and the fan-shaped beam outlet in the rotating process of the disc and forming a periodic gap from top to bottom or from left to right. Although the protocol is mature, it has the following drawbacks: firstly, most of X rays are shielded by a collimator and a chopper mechanism in the flying spot scanning imaging process, the utilization rate of the X rays is extremely low, and the obtained image has low signal-to-noise ratio and poor resolution; secondly, in order to improve the resolution and the signal-to-noise ratio of the image, the exposure time is usually required to be prolonged, but the flying spot scanning speed is limited by the rotating speed of the chopper wheel, so that the requirement of a high-flux detection occasion is difficult to meet; and thirdly, the mechanical mechanism for generating flying spots is complex, large and heavy, so that faults are easy to generate and the miniaturization of equipment is not facilitated.
Therefore, there is a need to provide an improved solution to the above-mentioned deficiencies of the prior art.
SUMMERY OF THE UTILITY MODEL
In view of the foregoing prior art shortcoming, an object of the utility model is to provide a many mode compton imaging detection device for solve among the prior art can not detect organic contraband and can examine the portable check out equipment of radionuclide, location again, and check out equipment total input cost is high, cause the problem of wasting of resources, and when solving compton scattering imaging among the prior art the ray utilization ratio is low, the image SNR who obtains is low, the resolution ratio is low and produce the mechanical mechanism of flying spot complicated, huge, the poor problem of portability.
To achieve the above and other related objects, the present invention provides a multi-mode compton imaging detection device, comprising: the device comprises a shell, a ray source, a scattering detector, an absorption detector, a visible light imaging unit, a signal processing unit, a central control panel, a power supply assembly and a display screen, wherein the ray source, the scattering detector, the absorption detector, the visible light imaging unit, the signal processing unit, the central control panel, the power supply assembly and the display screen are arranged in the shell;
wherein the radiation source is used for generating a ray beam; the scattering detectors are provided with a plurality of paths, and the plurality of paths of scattering detectors are arranged in an array manner to form two scattering detector arrays; the absorption detectors are provided with a plurality of paths, the plurality of paths of absorption detectors are respectively arranged corresponding to the plurality of paths of scattering detectors, and the plurality of paths of absorption detectors are arranged in an array form to form two absorption detector arrays; the visible light imaging unit is arranged on one side of the scattering detector and is used for shooting an image of a measured object; the signal processing unit is respectively connected with the scattering detector and the absorption detector and is used for processing the received signals; the central control board is connected with the signal processing unit and the visible light imaging unit and is used for carrying out data processing and image reconstruction on the received signals; the power supply component provides power for the ray source, the scattering detector, the absorption detector, the visible light imaging unit, the signal processing unit, the central control panel and the display screen; the display screen is connected with the central control panel and used for displaying the image reconstructed by the central control panel.
Preferably, the ray source is a Spindt line array ray source, and the Spindt line array ray source is located between the two scattering detector arrays and is arranged in parallel with the longitudinal direction of the scattering detector arrays.
Preferably, the Spindt linear array ray source comprises a substrate and a plurality of electron emitters, the plurality of electron emitters are arranged on the substrate in an array mode, the plurality of electron emitters are electrically connected with a ray controller, the ray controller controls the electron emitters to emit and close periodically, the plurality of electron emitters generate flying spot ray beams in turn, and the flying spot ray beams act on a measured object to generate scattered photons.
Preferably, the scatter detector comprises a first scintillation crystal, a first light cone and a first photoelectric conversion device which are coupled in sequence;
the absorption detector comprises a second scintillation crystal, a second light cone and a second photoelectric conversion device which are sequentially coupled and connected.
Preferably, the shielding layer and the reflecting layer are arranged around the first scintillation crystal and the second scintillation crystal;
mirror reflection layers are coated inside the first light cone and the second light cone and used for lossless transmission of optical signals.
Preferably, the first photoelectric conversion device and the second photoelectric conversion device are each one or a combination of a photomultiplier tube, a photodiode, an avalanche photodiode and a silicon photomultiplier tube.
Preferably, the signal processing unit comprises a signal amplifying circuit, an a/D converter, a threshold comparison circuit, a counting circuit and an amplitude analyzer which are connected in sequence.
Preferably, the power supply assembly comprises a power supply battery and a power supply controller, the power supply controller is connected with the power supply battery, and the power supply battery controls the on-off of the circuits of the ray source, the scattering detector, the absorption detector, the visible light imaging unit, the signal processing unit, the control panel and the display screen through the power supply controller.
Preferably, the scatter detector and the absorption detector are both semiconductor detectors.
Preferably, the detection device further comprises: and the storage unit is connected with the central control board and is used for storing the final detection result.
The utility model also provides an adopt the application of the compton formation of image detection device of above-mentioned multi-mode, detection device is applied to the formation of image detection of organic contraband to and be applied to the discrimination and the location detection of radioactive nuclide.
As described above, the utility model discloses a many mode compton formation of image detection device and application thereof has following beneficial effect:
the utility model provides a detection device includes scatter detector and absorption detector simultaneously, utilize scatter detector to realize that the formation of image to organic contraband article detects and examine radioactive nuclide, can also utilize scatter detector and absorption detector to realize the location to the radionuclide simultaneously, adopt a detection device both can realize the detection of multiple mode, make this check out test set convenient operation, portability is good, be applied to the formation of image detection of organic contraband article with it, and be used for examining and fix a position detection time measuring to radioactive nuclide, detection device's total input cost is low, resources are saved.
The utility model provides a detection device adopts Spindt linear array ray source to replace the flying spot ray of fan-shaped beam light source and chopper wheel dish among the prior art to produce the mechanism, because Spindt linear array ray source's scanning control is nimble and faster than mechanical scanning speed, scattering imaging speed and ray utilization ratio have effectively been improved, reduce the accumulative total absorbed dose of the shielding degree of difficulty and operating personnel, and the complexity that can the whole detection device of greatly reduced, improve the portability of device, the figure signal to noise ratio that obtains simultaneously is high and resolution ratio is high.
Drawings
Fig. 1 is a schematic diagram showing a partial structure of a multi-mode compton imaging detection apparatus according to an embodiment of the present invention.
Fig. 2 is a schematic plan view of a scatter detector according to an embodiment of the present invention.
Fig. 3 is a schematic perspective view of an absorption detector according to an embodiment of the present invention.
Fig. 4 is a schematic structural diagram of a Spindt linear array radiation source according to an embodiment of the present invention.
Fig. 5 is a schematic structural diagram illustrating a Spindt linear array radiation source generating a flying spot beam according to an embodiment of the present invention.
Fig. 6 is a cross-sectional view taken along line a-a of fig. 5.
Fig. 7 is a schematic diagram illustrating the operation principle of positioning the radionuclide by the multi-mode compton imaging detection apparatus according to an embodiment of the present invention.
Fig. 8 is a schematic structural diagram of a multi-mode compton imaging detection apparatus according to an embodiment of the present invention.
Description of the element reference numerals
100 Spindt linear array ray source
101 substrate
102 electron emitter
1021 flying spot ray bundle
200 scatter detector
201 first scintillation crystal
202 first light cone
203 first photoelectric conversion device
300 absorption detector
301 second scintillation crystal
302 second cone of light
303 second photoelectric conversion device
400 visible light imaging unit
500 signal processing unit
600 central control panel
700 power supply assembly
800 display screen
900 memory cell
Detailed Description
The following description of the embodiments of the present invention is provided for illustrative purposes, and other advantages and effects of the present invention will be readily apparent to those skilled in the art from the disclosure herein. The present invention can also be implemented or applied through other different specific embodiments, and various details in the present specification can be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention.
Referring to fig. 1 to 8, it should be noted that the drawings provided in the present embodiment are only schematic illustrations of the basic concept of the present invention, and only the components related to the present invention are shown in the drawings rather than being drawn according to the number, shape and size of the components in actual implementation, and the form, number and ratio of the components in actual implementation may be changed arbitrarily, and the layout of the components may be more complicated.
The utility model provides a detection device includes scatter detector and absorption detector simultaneously, utilize scatter detector to realize the formation of image detection and the discrimination to the radioactive nuclide to organic contraband, can also utilize scatter detector and absorption detector to realize the location to the radionuclide simultaneously, adopt a detection device both can realize the detection of multiple mode, make this check out test set convenient operation, the portability is good, be applied to the formation of image detection of organic contraband with it, and be used for when examining and the location detection to the radioactive nuclide, detection device's total input cost is low, resources are saved; the utility model provides a detection device adopts Spindt line array ray source to replace fan-shaped beam light source among the prior art and the flying spot ray of chopper wheel dish to produce the mechanism, because Spindt line array ray source's scanning control is nimble and faster than mechanical scanning speed, scattering imaging speed and ray utilization ratio have effectively been improved, reduce the accumulative total absorbed dose of the shielding degree of difficulty and operating personnel, and the complexity that can the whole detection device of greatly reduced, the portability of improvement device, the figure signal to noise ratio and the resolution ratio that obtain simultaneously are high.
The utility model provides a many modes's compton formation of image detection device, this detection device includes: the system comprises a machine shell, a ray source, a scattering detector 200, an absorption detector 300, a visible light imaging unit 400, a signal processing unit 500, a central control panel 600, a power supply assembly 700 and a display screen, wherein the ray source, the scattering detector 200, the absorption detector 300, the visible light imaging unit 400, the signal processing unit 500, the central control panel 600, the power supply assembly 700 and the display screen are arranged in the machine shell;
wherein, the ray source is used for generating ray beams; the scattering detector 200 is provided with a plurality of paths, and the plurality of paths of scattering detectors 200 are arranged in an array form to form two scattering detector 200 arrays; the absorption detector 300 is provided with a plurality of paths, the plurality of paths of absorption detectors 300 are respectively arranged corresponding to the plurality of paths of scattering detectors 200, and the plurality of paths of absorption detectors 300 are arranged in an array form to form two absorption detector 300 arrays; the visible light imaging unit 400 is disposed at one side of the scattering detector 200, and is used for capturing an image of a measured object; the signal processing unit 500 is respectively connected to the scattering detector 200 and the absorption detector 300, and is configured to process the received signals; the central control board 600 is connected to the signal processing unit 500 and the visible light imaging unit 400, and is configured to perform data processing and image reconstruction on the received signals; the power supply assembly 700 provides power for the radiation source, the scattering detector 200, the absorption detector 300, the visible light imaging unit 400, the signal processing unit 500, the central control panel 600 and the display screen; a display screen is connected to the central control panel 600 for presenting the images reconstructed by the central control panel 600.
Specifically, the signal processed by the signal processing unit 500 is transmitted to the central controller, the central controller performs data processing and image reconstruction on the received signal, and the visible light imaging unit 400 is mainly used for shooting a measured object and transmitting the shot image information to the central controller, so that the data processing and image reconstruction of the measured object can be assisted; in this embodiment, the visible light imaging unit 400 includes a camera and a flash, and is mainly used for capturing a picture, and the visible light imaging unit 400 may further include other elements, which are not limited herein.
Specifically, the scatter detector 200 is used to implement energy spectrum detection, dose rate detection, and backscatter imaging; the absorption detector 300 is disposed behind the scattering detector 200, and is configured to absorb energy of the gamma photons scattered by the scattering detector 200 and detect a position of the scattered gamma photons, and reconstruct and determine a position of the radiation source by combining orientations of the gamma photons received by the scattering detector 200 and the gamma photons received by the absorption detector 300.
By way of example, the source is a Spindt line array source 100, the Spindt line array source 100 being located between two arrays of scatter detectors 200 and being arranged parallel to the longitudinal direction of the arrays of scatter detectors 200.
By way of example, the Spindt linear array radiation source 100 includes a substrate 101 and a plurality of electron emitters 102, the plurality of electron emitters 102 are arranged on the substrate 101 in an array, and the plurality of electron emitters 102 are electrically connected to a radiation controller, the radiation controller controls the electron emitters 102 to periodically emit and turn off, the plurality of electron emitters 102 generate a flying spot radiation beam 1021 in turn, and the flying spot radiation beam 1021 acts on an object to be measured to generate scattered photons.
Specifically, the electron emitter 102 supplies electrons by utilizing photoelectric emission, field emission or secondary emission, the power supply of the Spindt linear array radiation source 100 is switched on, the electron emitter 102 is controlled by a radiation controller to be periodically started and closed one by one from top to bottom or from left to right, the electron emitter 102 generates conical flying spot ray beams 1021 in turn, when the conical flying spot ray beams 1021 transmit to the surface of the object to be measured, compton backscattering is generated between the conical flying spot ray beams 1021 and the electrons in the object to be measured, scattered photons are received by backscattering detectors 200 arranged at two sides of the Spindt linear array radiation source 100, and voltage signals are generated through photoelectric conversion; the scanning control of the flying spot ray bundle 1021 to the measured object is flexible, compared with the mainstream flying spot scanning technology of Compton scattering imaging in the prior art, the scanning speed in the embodiment is faster, the back scattering imaging speed can be effectively improved, and the shielding difficulty and the accumulated absorption dose of operators are reduced.
As an example, the scatter detector 200 comprises a first scintillation crystal 201, a first cone of light 202, and a first photoelectric conversion device 203 coupled in sequence; the absorption detector 300 comprises a second scintillation crystal 301, a second cone of light 302 and a second photo-conversion device 303 coupled in sequence.
Specifically, the scintillator is a material capable of emitting light after absorbing high-energy particles or rays, and is generally processed into a scintillation crystal in application; as shown in fig. 5, the first scintillation crystal 201 in the scatter detector 200 receives scattered photons and converts the scattered photons into visible light, the visible light is transmitted to the first photoelectric conversion device 203 after being reflected by the first light cone 202 for multiple times, and the first photoelectric conversion device 203 converts an optical signal into a voltage signal; referring to FIG. 6, a second cone of light 302 in the absorption detector 300 is coupled between the second scintillation crystal 301 and the second cone of light 302; the first scintillation crystal 201 in this embodiment is relatively small in density and thickness, such as a GOS (gadolinium oxysulfide) thin film, CsI (cesium iodide) crystal, CZT (cadmium zinc telluride) crystal, etc., which are 2 to 5mm thick; the second scintillation crystal 301 is relatively large in density and thickness, for example, crystals such as 1-2 cm thick CsI (cesium iodide), GOS (gadolinium oxysulfide), GAGG (gadolinium aluminum gallium garnet), CZT (cadmium zinc telluride), and the like.
When the detection device of the utility model is used for positioning the radioactive nuclide, the decay release energy from the radioactive nuclide is E 0 The gamma rays of (a) are first incident on the scatter detector 200 and compton scatter is generated in the scatter detector 200, resulting in an energy deposit E 1 The scattered photons exit through the scatter detector 200, and produce a photoelectric effect in the absorption detector 300, and the photon energy is completely absorbed by the detector.
As an example, the shielding layer and the reflective layer are provided around each of the first scintillation crystal 201 and the second scintillation crystal 301; mirror reflection layers are coated inside the first light cone 202 and the second light cone 302 and used for lossless transmission of optical signals; the first photoelectric conversion device 203 and the second photoelectric conversion device 303 are each one or a combination of a photomultiplier tube, a photodiode, an avalanche photodiode, and a silicon photomultiplier tube.
Specifically, the shielding layer is used for shielding visible light and rays, on one hand, the utilization rate of the rays is improved, on the other hand, the harm of rays to operators is reduced, the reflecting layer reflects the rays which may leak back to the reaction area, and the utilization rate of the rays is improved.
As an example, the signal processing unit 500 includes a signal amplifying circuit, an a/D converter, a threshold value comparing circuit, a counting circuit, and an amplitude analyzer, which are sequentially connected and disposed.
Specifically, the signal amplification circuit is a circuit that amplifies a weak signal, and in this embodiment, the signal amplification circuit further amplifies a voltage signal; the a/D converter is an electronic component that converts an analog signal into a digital signal, and in this embodiment, converts an amplified voltage signal into a digital signal; the threshold comparison comprises a self-adaptive Steind unbiased risk estimation threshold, an average threshold method or a maximum minimum threshold method; the counting circuit consists of a basic counting unit and a plurality of control gates; the amplitude analyzer is an instrument for measuring the amplitude distribution of electric pulse signals, classifies the pulse signals according to the amplitude and records the number of each type of signals, is usually used for analyzing the output signals of a ray detector and measuring the energy spectrum of rays; the specific structure of each element in the signal processing unit 500 is not limited herein, and may be suitable for practical purposes.
As an example, the power supply module 700 includes a power supply battery and a power supply controller, the power supply controller is connected to the power supply battery, and the power supply battery controls the on/off of the circuits of the radiation source, the scattering detector 200, the absorption detector 300, the visible light imaging unit 400, the signal processing unit 500, the control board and the display screen through the power supply controller.
Specifically, the power controller is used for controlling the on-off of circuits of different elements, and when radionuclide discrimination, energy spectrum detection or radioactive dose detection is carried out, only one or more paths of the scattering detector 200, the signal processing unit 500, the control panel and the display screen can be electrified; when positioning the radionuclide, all circuits except the radiation source and the visible light imaging unit 400 need to be switched on; when the organic contraband is detected, the circuit related to the absorption detector 300 is turned off and the other circuits are turned on.
As an example, scatter detector 200 and absorption detector 300 are both semiconductor detectors.
Specifically, the semiconductor detector is a radiation detector using a semiconductor material as a detection medium, the most common semiconductor materials are germanium and silicon, the basic principle is that charged particles generate electron-hole pairs in a sensitive volume of the semiconductor detector, and the electron-hole pairs drift under the action of an external electric field to output signals.
As an example, the detection apparatus further includes: and a storage unit 900, wherein the storage unit 900 is connected with the central control board 600 and is used for storing the final detection result.
For better understanding the utility model discloses well multi-mode compton formation of image detection device, the utility model discloses still provide a multi-mode compton formation of image detection device's application, be used for this detection device organic contraband's formation of image to detect to and be used for the discrimination and the location detection to the radioactive nuclide with this detection device, concrete application is as following embodiment.
Example 1
The embodiment provides a multimode compton imaging detection device applied to radionuclide screening and radiation dose detection, and the specific detection method includes the following steps:
a1, the power controller controls the power supply assembly 700 to open the circuits of one or more paths of scattering detectors 200, the signal processing unit 500, the control panel and the display screen;
a2, exciting and de-exciting the first scintillation crystal 201 on the scatter detector 200 under the action of characteristic gamma rays released by the decay of radioactive nuclides to generate fluorescence or phosphorescence, and transmitting the fluorescence or phosphorescence to the first photoelectric conversion device 203 to convert the optical signal into a voltage signal through multiple reflections of the first light cone 202;
a3, transmitting the voltage signal to the signal processing unit 500, further amplifying the signal, A/D converting, comparing the threshold value, counting by the counting circuit and analyzing by the amplitude analyzer to form a spectrogram;
a4, and transmitting the formed spectrogram to a central control panel 600, matching and comparing the spectral peak in the spectrogram with the spectral peak of nuclide in a database through a peak matching algorithm, reconstructing to generate a graph, and displaying the characteristic energy spectrum of the detected radionuclide, the nuclide matching result and the dosage information on a display screen.
Example 2
The embodiment also provides a multimode Compton imaging detection device applied to positioning detection of radioactive nuclides, and the specific detection method comprises the following steps:
b1, the power controller controls the power supply assembly 700 to turn on the circuits of the scattering detector 200 and the absorption detector 300 and the circuits of the visible light imaging unit 400, the signal processing unit 500, the control panel and the display screen;
b2, aligning the probe of the visible light imaging unit 400 and the scattering detector 200 to the suspicious azimuth view direction of the radionuclide to be detected, and aligning the visible light imaging unit 400 to the radionuclide to be detectedThe orientation of the elements is photographed, and the energy released by radioactive nuclide decay is E 0 First enters the scatter detector 200 and compton scatter is generated in the scatter detector 200, wherein the compton scattered photons generate an energy deposit E on the scatter detector 200 1 The scattering position is (x) 1 ,y 1 ,z 1 ) The first scintillation crystal 201 is excited and de-excited to generate fluorescence or phosphorescence, the fluorescence is converted into a first electrical signal by the first light cone 202 and the first photoelectric conversion device 203, the first electrical signal is processed by the signal processing unit 500, and the information of the incident position range of the ray is recorded;
b3, after the photons scattered by Compton are emitted by the scattering detector 200, a photoelectric effect is generated in the absorption detector 300, photon energy is completely absorbed by the absorption detector 300, electrons outside the nucleus of the second scintillation crystal 301 are excited in the absorption process, fluorescence is generated after the electrons are de-excited, the fluorescence is converted into a second electric signal through a second light cone 302 and a second photoelectric conversion device 303, the second electric signal is processed by the signal processing unit 500, and the range information of the incident position of the ray is recorded; wherein the gamma ray deposits energy E in the absorption detector 300 0 -E 1 The absorption position is (x) 2 ,y 2 ,z 2 )。
According to the Compton imaging principle, the emission position of a gamma ray can be determined at a point on the surface of a cone whose vertex is on the scatter detector 200 and whose coordinate is (x) 1 ,y 1 ,z 1 ) The cone axis being the scattering point (x) 1 ,y 1 ,z 1 ) And absorption point (x) 2 ,y 2 ,z 2 ) On the straight line, there are:
in the formula m e c 2 Is the static mass of the electrons.
The embodiment can determine the position range of the radionuclide, and the specific position of the radioactive source can be determined by multiple detections, the statistical calculation of the intersection point of a plurality of cones and the combination of the images shot by the visible light imaging unit 400, so that the positioning detection of the radionuclide is realized.
Example 3
The embodiment also provides a multi-mode Compton imaging detection device applied to detection of organic contraband, and the specific detection method comprises the following steps:
c1, the power supply controller controls the power supply assembly 700 to turn on the circuits of the Spindt linear array ray source 100, the two scatter detector 200 arrays and the circuits of the signal processing unit 500, the control panel and the display screen, and turns off the circuit of the absorption detector 300;
c2, aligning the scattering detector 200 array to the object to be measured, controlling the electron emitters 102 to be periodically turned on and off one by one from top to bottom or from left to right by the ray controller, generating conical flying spot ray beams 1021 by the plurality of electron emitters 102 in turn, enabling the conical flying spot ray beams 1021 to act on the object to be measured, and receiving the rays generating the Compton backscattering action by the backscattering detector 200 arrays positioned at two sides of the Spindt line array ray source 100 to form voltage signals;
c3, transmitting the voltage signal to the signal processing unit 500 for processing to obtain an electron density distribution image of the measured point, and then transmitting the image to the central control board 600;
c4, moving the detecting device left and right or up and down at a constant speed to obtain electron density images of a plurality of measured points, and the central control board 600 reconstructs and splices the multi-point electron density images to obtain the electron density image of the whole measured object.
To sum up, the utility model provides a detection device includes scattering detector and absorption detector simultaneously, utilizes scattering detector to realize the formation of image detection and the discrimination to the radioactive nuclide of organic contraband, can also utilize scattering detector and absorption detector to realize the location to the radioactive nuclide simultaneously, adopts a detection device both can realize the detection of multiple mode for this check out test set convenient operation, portability are good, be applied to the formation of image detection of organic contraband with it, and be used for when examining and the location is detected radioactive nuclide, detection device's total input cost is low, resources are saved; the utility model provides a detection device adopts Spindt linear array ray source to replace the flying spot ray of fan-shaped beam light source and chopper wheel dish among the prior art to produce the mechanism, because Spindt linear array ray source's scanning control is nimble and faster than mechanical scanning speed, scattering imaging speed and ray utilization ratio have effectively been improved, reduce the accumulative total absorbed dose of the shielding degree of difficulty and operating personnel, and the complexity that can the whole detection device of greatly reduced, improve the portability of device, the figure signal to noise ratio that obtains simultaneously is high and resolution ratio is high. Therefore, the utility model effectively overcomes various defects in the prior art and has high industrial utilization value.
The above embodiments are merely illustrative of the principles and effects of the present invention, and are not to be construed as limiting the invention. Modifications and variations can be made to the above-described embodiments by those skilled in the art without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which may be made by those skilled in the art without departing from the spirit and technical spirit of the present invention be covered by the claims of the present invention.
Claims (10)
1. A multimode compton imaging detection device, said detection device comprising: the device comprises a shell, a ray source, a scattering detector, an absorption detector, a visible light imaging unit, a signal processing unit, a central control panel, a power supply assembly and a display screen, wherein the ray source, the scattering detector, the absorption detector, the visible light imaging unit, the signal processing unit, the central control panel, the power supply assembly and the display screen are arranged in the shell;
wherein the radiation source is used for generating a ray beam; the scattering detectors are provided with a plurality of paths, and the plurality of paths of scattering detectors are arranged in an array manner to form two scattering detector arrays; the absorption detectors are provided with a plurality of paths, the plurality of paths of absorption detectors are respectively arranged corresponding to the plurality of paths of scattering detectors, and the plurality of paths of absorption detectors are arranged in an array manner to form two absorption detector arrays; the visible light imaging unit is arranged on one side of the scattering detector and is used for shooting an image of a measured object; the signal processing unit is respectively connected with the scattering detector and the absorption detector and is used for processing the received signals; the central control board is connected with the signal processing unit and the visible light imaging unit and is used for carrying out data processing and image reconstruction on the received signals; the power supply assembly provides power for the ray source, the scattering detector, the absorption detector, the visible light imaging unit, the signal processing unit, the central control panel and the display screen; the display screen is connected with the central control panel and used for displaying the image reconstructed by the central control panel.
2. The multi-mode compton imaging detection device of claim 1, characterized by: the ray source is a Spindt line array ray source, and the Spindt line array ray source is located between the two scattering detector arrays and is arranged in parallel with the longitudinal direction of the scattering detector arrays.
3. The multi-mode compton imaging detection device of claim 2, characterized by: the Spindt linear array ray source comprises a substrate and a plurality of electron emitters, wherein the plurality of electron emitters are arranged on the substrate in an array mode, the plurality of electron emitters are electrically connected with a ray controller, the ray controller controls the electron emitters to emit and close periodically, the plurality of electron emitters generate flying spot ray beams in turn, and the flying spot ray beams act with a measured object to generate scattered photons.
4. The multi-mode compton imaging detection device of claim 1, characterized by: the scattering detector comprises a first scintillation crystal, a first light cone and a first photoelectric conversion device which are sequentially coupled and connected;
the absorption detector comprises a second scintillation crystal, a second light cone and a second photoelectric conversion device which are sequentially coupled and connected.
5. The multi-mode compton imaging detection device of claim 4, characterized by: a shielding layer and a reflecting layer are arranged around the first scintillation crystal and the second scintillation crystal;
mirror reflection layers are coated inside the first light cone and the second light cone and used for lossless transmission of optical signals.
6. The multi-mode compton imaging detection device of claim 4, characterized by: the first photoelectric conversion device and the second photoelectric conversion device are one or a combination of a photomultiplier tube, a photodiode, an avalanche photodiode and a silicon photomultiplier tube.
7. The multi-mode compton imaging detection device of claim 1, characterized by: the signal processing unit comprises a signal amplifying circuit, an A/D converter, a threshold value comparison circuit, a counting circuit and an amplitude analyzer which are sequentially connected.
8. The multi-mode compton imaging detection device of claim 1, characterized by: the power supply assembly comprises a power supply battery and a power supply controller, the power supply controller is connected with the power supply battery, and the power supply battery controls the on-off of circuits of the ray source, the scattering detector, the absorption detector, the visible light imaging unit, the signal processing unit, the control panel and the display screen through the power supply controller.
9. The multi-mode compton imaging detection device of claim 1, characterized by: the scatter detector and the absorption detector are both semiconductor detectors.
10. The multi-mode compton imaging detection device of claim 1, characterized by: the detection device further comprises: and the storage unit is connected with the central control board and is used for storing the final detection result.
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