CN116297587A - Multimode Compton imaging detection device and application thereof - Google Patents
Multimode Compton imaging detection device and application thereof Download PDFInfo
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Abstract
The invention provides a multimode Compton imaging detection device and application, comprising: the device comprises a shell, a radiation source, a scattering detector, an absorption detector, a visible light imaging unit, a signal processing unit, a central control board, a power supply assembly and a display screen, wherein the radiation source, the scattering detector, the absorption detector, the visible light imaging unit, the signal processing unit, the central control board, the power supply assembly and the display screen are arranged in the shell; the multipath scattering detector arrays are arranged to form two scattering detector arrays; the multi-channel absorption detector arrays are arranged 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 connected with the scattering detector and the absorption detector respectively; 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 detection device is applied to screening and positioning detection of organic contraband and radioactive nuclides. The detection device can realize detection in multiple modes, is convenient to operate and good in portability, and has low overall input cost and resource conservation.
Description
Technical Field
The invention belongs to the technical field of radiation imaging inspection, and particularly relates to a multi-mode Compton imaging detection device and application thereof.
Background
At present, an international detection mode for trace drugs and explosives mainly adopts ion mobility spectrometry, mass spectrometry and a combination technology thereof, and detection for small and large amounts of drugs and explosives mainly depends on radiation imaging technology means. The drugs and explosives are composed of low atomic number elements (C, H, N, O, P and the like), the material density is low, the electron density is higher, the radiation absorption capacity is poor, the Compton scattering effect is strong, the Compton backscattering imaging technology can be utilized to highlight and display organic contraband products such as drugs and explosives, and the backscattering detector is flexible in layout, so that the backscattering imaging technology is very suitable for imaging detection of organic contraband products such as drugs or explosives with good interlayer and sealing, and is largely equipped by customs side protection.
For the identification and detection of radionuclides or substances, a spectrometer is generally used for measuring the energy spectrum of a target substance to be detected, and the obtained characteristic energy spectrum is preprocessed, peak-seeking and matched to determine the nuclide type.
For radionuclide positioning, there are three effective techniques, namely aperture imaging, coded aperture imaging and Compton scattering imaging, and because the Compton scattering imaging technique does not need a collimator to limit the field of view, and is superior to the other two types of techniques in portability and imaging view angle range, the Compton forward scattering-based imaging radioactive source positioning technique has also been widely adopted.
In the prior art, on one hand, technical reports about a portable detection device and a related device for identifying and positioning organic contraband products such as drugs and explosives and radionuclides are not found, in the prior art, compton backscattering imaging is adopted to detect the organic objects such as drugs and explosives, a spectrometer is adopted to discriminate the radionuclides, and Compton forward scattering is adopted to realize the positioning of the radionuclides, so that the overall investment cost of detection equipment is high and resources are wasted easily.
On the other hand, the principle of the flying spot scanning technology scheme of the Compton scattering imaging mainstream is that a rotating disc with slits uniformly opened on a circle is added at the front end of a fan-shaped beam outlet of an X-ray machine, and the slits and the fan-shaped beam outlet intersect and form a periodical gap from top to bottom or from left to right in the rotating process of the disc, so that a pen-shaped or flying spot-shaped ray beam is formed. Although the protocol is mature, it has the following drawbacks: (1) 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; (2) in order to improve the resolution ratio 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 requirements of high-flux detection occasions are difficult to meet; (3) the mechanical mechanism for generating flying spots is complex, large and heavy, is easy to generate faults and is unfavorable for the miniaturization of equipment.
Accordingly, there is a need to provide an improved solution to the above-mentioned deficiencies of the prior art.
Disclosure of Invention
In view of the above-mentioned drawbacks of the prior art, the present invention is directed to providing a multi-mode compton imaging detection device and an application thereof, which are used for solving the problems that in the prior art, there is no portable detection device capable of detecting organic contraband and also capable of screening and positioning radionuclides, the total input cost of the detection device is high, and resource waste is caused, and the problems that in the prior art, the radiation utilization rate is low, the obtained image has a low signal-to-noise ratio, the resolution is low, and the mechanical mechanism for generating flying spots is complex, huge and portability is poor.
To achieve the above and other related objects, the present invention provides a multi-mode compton imaging detection apparatus, comprising: the device comprises a shell, a radiation source, a scattering detector, an absorption detector, a visible light imaging unit, a signal processing unit, a central control board, a power supply assembly and a display screen, wherein the radiation source, the scattering detector, the absorption detector, the visible light imaging unit, the signal processing unit, the central control board, the power supply assembly and the display screen are arranged in the shell;
wherein the radiation source is used for generating a radiation beam; the scattering detector is provided with a plurality of paths, and the plurality of paths of scattering detector arrays are arranged 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 and correspondingly arranged with the plurality of paths of scattering detectors, and the plurality of paths of absorption detector arrays are arranged 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 the 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 presenting images reconstructed by the central control panel.
Preferably, the radiation source is a Spindt line array radiation source, and the Spindt line array radiation source is located between two scattering detector arrays and is arranged parallel to the longitudinal direction of the scattering detector arrays.
Preferably, the Spindt line array radiation source comprises a substrate and a plurality of electron emitters, the electron emitters are arrayed on the substrate, the electron emitters are electrically connected with a radiation controller, the radiation controller controls the electron emitters to periodically emit and close, the electron emitters alternately generate flying spot ray beams, and the flying spot ray beams act with an object to be measured to generate scattered photons.
Preferably, 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.
Preferably, shielding layers and reflecting layers are arranged around the first scintillation crystal and the second scintillation crystal;
the inside of the first light cone and the inside of the second light cone are respectively coated with a specular reflection layer, and the specular reflection layers are used for lossless transmission of optical signals;
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.
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 sequentially connected.
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 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 includes: and the storage unit is connected with the central control board and used for storing the final detection result.
The invention also provides application of the Compton imaging detection device adopting the multiple modes, and the detection device is applied to imaging detection of organic contraband and screening and positioning detection of radioactive nuclides.
As described above, the multi-mode compton imaging detection device and the application thereof of the present invention have the following beneficial effects:
the detection device comprises the scattering detector and the absorption detector, the scattering detector is used for realizing imaging detection of the organic contraband and screening of the radioactive nuclide, the scattering detector and the absorption detector are used for realizing positioning of the radioactive nuclide, and the detection device can realize detection in multiple modes, so that the detection device is convenient to operate and good in portability, and is applied to imaging detection of the organic contraband, and when being used for screening and positioning detection of the radioactive nuclide, the overall input cost of the detection device is low, and resources are saved.
The detection device adopts the Spindt line array ray source to replace a fan-shaped beam light source and a flying spot ray generation mechanism of a chopper wheel disc in the prior art, and because the Spindt line array ray source is flexibly controlled in scanning and is faster than a mechanical scanning speed, the scattering imaging speed and the ray utilization rate are effectively improved, the shielding difficulty and the accumulated absorbed dose of operators are reduced, the complexity of the whole detection device can be greatly reduced, the portability of the device is improved, and meanwhile, the obtained graph has high signal-to-noise ratio and high resolution.
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 invention.
Fig. 4 is a schematic diagram of a Spindt line array radiation source in an embodiment of the invention.
Fig. 5 is a schematic diagram of a Spindt line array radiation source for generating a flying spot beam in accordance with an embodiment of the invention.
Fig. 6 shows a cross-section along A-A of fig. 5.
Fig. 7 is a schematic diagram illustrating the operation of the multi-mode compton imaging detection apparatus for radionuclide localization in accordance with 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 element reference numerals
100 Spindt line array ray source
101. Substrate and method for manufacturing the same
102. Electron emitter
1021. Flying spot beam
200. Scattering detector
201. First scintillation crystal
202. First light cone
203. First photoelectric conversion device
300. Absorption detector
301. Second scintillation crystal
302. Second light cone
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
Other advantages and effects of the present invention will become apparent to those skilled in the art from the following disclosure, which describes the embodiments of the present invention with reference to specific examples. The invention may be practiced or carried out in other embodiments that depart from the specific details, and the details of the present description may be modified or varied from the spirit and scope of the present invention.
Referring to fig. 1 to 8, it should be noted that the schematic drawings provided in this embodiment only illustrate the basic concept of the present invention, and only the components related to the present invention are shown in the drawings, rather than the number, shape and size of the components in actual implementation, and the form, number and proportion of each component in actual implementation may be arbitrarily changed, and the layout of the components may be more complex.
The detection device comprises the scattering detector and the absorption detector, the scattering detector is used for realizing imaging detection of the organic contraband and screening of the radioactive nuclide, the scattering detector and the absorption detector are used for realizing positioning of the radioactive nuclide, and the detection device can realize detection in multiple modes, so that the detection device is convenient to operate and good in portability, and is applied to imaging detection of the organic contraband, and when being used for screening and positioning detection of the radioactive nuclide, the overall input cost of the detection device is low, and resources are saved; the detection device adopts the Spindt line array ray source to replace a fan-shaped beam light source and a flying spot ray generation mechanism of a chopper wheel disc in the prior art, and because the Spindt line array ray source is flexibly controlled in scanning and is faster than a mechanical scanning speed, the scattering imaging speed and the ray utilization rate are effectively improved, the shielding difficulty and the accumulated absorbed dose of operators are reduced, the complexity of the whole detection device can be greatly reduced, the portability of the device is improved, and meanwhile, the obtained graph has high signal-to-noise ratio and high resolution.
The present invention provides a multimode Compton imaging detection device, comprising: a housing, a radiation source, a scatter detector 200, an absorption detector 300, a visible light imaging unit 400, a signal processing unit 500, a central control board 600, a power supply assembly 700, and a display screen disposed in the housing;
wherein the radiation source is used for generating a radiation beam; the scattering detector 200 is provided with multiple paths, and the multiple paths of scattering detectors 200 are arrayed to form two scattering detector 200 arrays; the absorption detectors 300 are provided with multiple paths, the multiple paths of absorption detectors 300 are respectively arranged corresponding to the multiple paths of scattering detectors 200, and the multiple paths of absorption detectors 300 are arranged in an array manner to form two absorption detector 300 arrays; the visible light imaging unit 400 is disposed at one side of the scatter detector 200, and is used for photographing an image of the measured object; the signal processing unit 500 is connected to the scatter detector 200 and the absorption detector 300, respectively, and is used for processing the received signals; the central control board 600 is connected with the signal processing unit 500 and the visible light imaging unit 400, and is used for performing data processing and image reconstruction on the received signals; the power supply assembly 700 supplies power to the radiation source, the scatter detector 200, the absorption detector 300, the visible light imaging unit 400, the signal processing unit 500, the central control board 600, and the display screen; the display screen is connected to the central control panel 600 for presenting images reconstructed by the central control panel 600.
Specifically, the signals processed by the signal processing unit 500 are transmitted to the central controller, the central controller performs data processing and image reconstruction on the received signals, the visible light imaging unit 400 is mainly used for shooting the detected object, and the shot image information is transmitted to the central controller, so that the auxiliary effect on the data processing and image reconstruction of the detected object can be achieved; in the present embodiment, the visible light imaging unit 400 includes a camera and a flash, and is mainly used for capturing graphics, and the visible light imaging unit 400 may also include other elements, which are not limited herein.
Specifically, the scatter detector 200 is used to implement spectrum detection, dose rate detection, and back scatter imaging; the absorption detector 300 is disposed behind the scattering detector 200, and is configured to absorb energy of gamma photons scattered by the scattering detector 200 and detect positions of the scattered gamma photons, and reconstruct and determine positions of the radiation sources by combining orientations of gamma photons received by the scattering detector 200 and gamma photons received by the absorption detector 300.
By way of example, the radiation source is a Spindt-wire array radiation source 100, the Spindt-wire array radiation 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.
As an example, the Spindt line array radiation source 100 includes a substrate 101 and a plurality of electron emitters 102, where 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, where the radiation controller controls periodic emission and closing of the electron emitters 102, and the plurality of electron emitters 102 alternately generate a flying spot beam 1021, where the flying spot beam 1021 acts on a measured object to generate scattered photons.
Specifically, the electron emitter 102 supplies electrons by using photoemission, field emission or secondary emission, the power of the Spindt line array radiation source 100 is turned on, the electron emitter 102 is controlled to be periodically turned on and off one by one from top to bottom or from left to right by the radiation controller, the electron emitter 102 alternately generates a conical flying spot beam 1021, compton backscattering is generated with electrons in the object to be measured when the conical flying spot beam 1021 is transmitted to the surface of the object to be measured, and scattered photons are received by the backscattering detectors 200 arranged at two sides of the Spindt line array radiation source 100 and generate voltage signals through photoelectric conversion; compared with the main stream 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, scatter detector 200 includes 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 light cone 302 and a second photoelectric 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 usually processed into a scintillation crystal in application; the first scintillation crystal 201 in the scatter detector 200 receives scattered photons and converts them into visible light, which is transmitted to the first photoelectric conversion device 203 after multiple reflections of the first light cone 202, the first photoelectric conversion device 203 converts the optical signal into a voltage signal, and the first scintillation crystal 201 is located at the forefront end, and the first light cone 202 is coupled between the first scintillation crystal 201 and the first photoelectric conversion device 203, as shown in fig. 5; referring to fig. 6, a second light cone 302 in the absorption detector 300 is coupled between the second scintillation crystal 301 and the second light cone 302; the first scintillation crystal 201 in the present embodiment is relatively small in density and thickness, such as a GOS (gadolinium oxysulfide) thin film of 2 to 5mm thick, a CsI (cesium iodide) crystal, a CZT (cadmium zinc telluride) crystal, or the like; the second scintillator crystal 301 is relatively large in density and thickness, such as CsI (cesium iodide), GOS (gadolinium oxysulfide), GAGG (gadolinium aluminum gallium garnet), CZT (cadmium zinc telluride), or the like, which is 1 to 2cm thick.
When the detection device of the invention is used for radionuclide localization, the energy released from radionuclide decay is E 0 Is first incident on scatter detector 200 and Compton scatter is generated in scatter detector 200, resulting in energy deposition E 1 The scattered photons are emitted by the scatter detector 200, and generate photoelectricity in the absorption detector 300The effect is that photon energy is fully absorbed by the detector.
As an example, the first scintillation crystal 201 and the second scintillation crystal 301 are provided with a shielding layer and a reflecting layer around each; the inner parts of the first light cone 202 and the second light cone 302 are coated with a specular reflection layer, and the specular reflection layer is used for lossless transmission of optical signals; the first photoelectric conversion device 203 and the second photoelectric conversion device 303 are 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, so that on one hand, the utilization rate of rays is improved, on the other hand, the harm of rays to operators is reduced, the reflecting layer reflects rays which possibly leak back to the reaction area, and the utilization rate of rays is improved, but in the embodiment, the materials selected for the shielding layer and the reflecting layer are not excessively limited.
As an example, the signal processing unit 500 includes a signal amplifying circuit, an a/D converter, a threshold value comparison, a counting circuit, and an amplitude analyzer, which are sequentially connected.
Specifically, the signal amplifying circuit is a circuit that amplifies a weak signal, and in this embodiment, the signal amplifying circuit further amplifies a voltage signal; the a/D converter is an electronic element 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 an adaptive Steind unbiased risk estimation threshold, an average threshold method or a maximum and 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 the electric pulse signals, classifies the pulse signals according to the amplitude, records the number of each type of signals, and is commonly used for analyzing the output signals of the 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 satisfy actual needs.
As an example, the power supply assembly 700 includes a power supply battery and a power supply controller, and the power supply controller is connected to the power supply battery, and the power supply battery controls the on-off of circuits of the radiation source, the scatter 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 supply controller is used for controlling the on-off of circuits of different elements, and when radionuclide screening, energy spectrum detection or radioactive dose detection is performed, only one or more of the scattering detector 200, the signal processing unit 500, the control panel and the display screen can be electrified; when radionuclide positioning is performed, all circuits except the radiation source and the visible light imaging unit 400 need to be switched on; when detecting organic contraband, the circuit related to the absorption detector 300 is turned off, and the other circuit is turned on.
As an example, both scatter detector 200 and absorption detector 300 are 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, and 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 device 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.
In order to better understand the multi-mode Compton imaging detection device, the invention also provides application of the multi-mode Compton imaging detection device, which is used for imaging detection of organic contraband and screening and positioning detection of radioactive nuclides, and the application is specifically implemented in the following embodiments.
Example 1
The embodiment provides a multi-mode Compton imaging detection device applied to radionuclide screening and radioactive dose detection, and the specific detection method comprises the following steps:
a1, a power supply controller controls a power supply assembly 700 to start circuits of one or more of the scattering detector 200, the signal processing unit 500, a control panel and a display screen;
a2, after the first scintillation crystal 201 on the scattering detector 200 is stimulated and de-stimulated under the action of characteristic gamma rays released by radionuclide decays, fluorescence or phosphorescence is generated, and the fluorescence or phosphorescence is transmitted to the first photoelectric conversion device 203 through multiple reflections of the first light cone 202 to convert an optical signal into a voltage signal;
a3, transmitting the voltage signal to a signal processing unit 500, and further amplifying the signal, performing A/D conversion, comparing the threshold value, counting by a counting circuit and analyzing by an amplitude analyzer to form a spectrogram;
and a4, transmitting the formed spectrogram to a central control board 600, carrying out matching comparison between spectral peaks in the spectrogram and spectral peaks of nuclides in a database through a peak value matching algorithm, reconstructing to generate a graph, and displaying the characteristic energy spectrum, the nuclide matching result and the dosage information of the detected radioactive nuclide in a display screen.
Example 2
The embodiment also provides a multi-mode Compton imaging detection device applied to the positioning detection of the radioactive nuclide, and the specific detection method comprises the following steps:
b1, a power supply controller controls the power supply assembly 700 to start circuits of the scattering detector 200 and the absorption detector 300 and to start circuits of the visible light imaging unit 400, the signal processing unit 500, the control board and the display screen;
b2, aligning the probe of the visible light imaging unit 400 and the scattering detector 200 to the visual angle direction of the suspicious azimuth of the radionuclide to be detected, shooting the azimuth of the radionuclide to be detected by the visible light imaging unit 400, and releasing energy of decay of the radionuclide to be detected as E 0 Is first incident on scatter detector 200 and Compton scatter is generated in scatter detector 200, wherein photons that generate Compton scatter generate energy deposit E on scatter detector 200 1 The scattering position is (x 1 ,y 1 ,z 1 ) After the first scintillation crystal 201 is excited and de-excited, fluorescence or phosphorescence is generated, and the fluorescence is subjected to first light cone 202 and first photoelectric conversionThe device 203 converts the first electric signal into a first electric signal, and the first electric signal is processed by the signal processing unit 500 and records the radiation incident position range information;
b3, after the photons scattered by Compton are emitted by the scattering detector 200, generating a photoelectric effect in the absorption detector 300, completely absorbing photon energy by the absorption detector 300, exciting electrons outside the atoms of the second scintillation crystal 301 in the absorption process, generating fluorescence after the electrons are de-excited, converting the fluorescence into a second electric signal by the second light cone 302 and the second photoelectric conversion device 303, processing the second electric signal by the signal processing unit 500, and recording the ray incidence position range information; wherein the gamma rays deposit energy E in the absorption detector 300 0 -E 1 The absorption position is (x 2 ,y 2 ,z 2 )。
According to Compton imaging principles, the emission location of a gamma ray can be determined at a point on the surface of a cone whose apex is on scatter detector 200, with coordinates (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:
m is in e c 2 Is the static mass of electrons.
The present embodiment can determine the position range of the radionuclide, and by detecting for many times and calculating the intersection point of the cones, and combining the pattern shot by the visible light imaging unit 400, the specific position of the radioactive source can be determined, so as to realize the positioning detection of the radionuclide.
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, a power supply controller controls a power supply assembly 700 to turn on a Spindt line array ray source 100, circuits of two scattering detector 200 arrays, circuits of a signal processing unit 500, a control panel and a display screen, and turns off a circuit of an absorption detector 300;
c2, aligning the scattering detector 200 array to the measured object, controlling the electron emitters 102 to be periodically started and closed one by one from top to bottom or from left to right by the ray controller, alternately generating conical flying spot ray beams 1021 by a plurality of the electron emitters 102, enabling the conical flying spot ray beams 1021 to act on the measured object, and enabling the rays generating Compton backscattering to be received 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 transmitting the electron density distribution image to the central control board 600;
and c4, moving the detection device left and right or up and down at a constant speed to obtain electron density images of a plurality of detected points, and reconstructing and splicing the multi-point electron density images by the central control board 600 to obtain the electron density image of the whole detected object.
In summary, the detection device in the invention comprises the scattering detector and the absorption detector, the scattering detector is used for realizing the imaging detection of the organic contraband and the discrimination of the radioactive nuclide, the scattering detector and the absorption detector are also used for realizing the positioning of the radioactive nuclide, and the detection device can realize the detection of multiple modes, so that the detection device has convenient operation and good portability, is applied to the imaging detection of the organic contraband, and has low overall input cost and resource conservation when being used for the discrimination and positioning detection of the radioactive nuclide; the detection device adopts the Spindt line array ray source to replace a fan-shaped beam light source and a flying spot ray generation mechanism of a chopper wheel disc in the prior art, and because the Spindt line array ray source is flexibly controlled in scanning and is faster than a mechanical scanning speed, the scattering imaging speed and the ray utilization rate are effectively improved, the shielding difficulty and the accumulated absorbed dose of operators are reduced, the complexity of the whole detection device can be greatly reduced, the portability of the device is improved, and meanwhile, the obtained graph has high signal-to-noise ratio and high resolution. Therefore, the invention effectively overcomes various defects in the prior art and has high industrial utilization value.
The above embodiments are merely illustrative of the principles of the present invention and its effectiveness, and are not intended to limit the invention. Modifications and variations may be made to the above-described embodiments by those skilled in the art without departing from the spirit and scope of the invention. Accordingly, it is intended that all equivalent modifications and variations of the invention be covered by the claims, which are within the ordinary skill of the art, be within the spirit and scope of the present disclosure.
Claims (10)
1. A multimode compton imaging detection apparatus, said detection apparatus comprising: the device comprises a shell, a radiation source, a scattering detector, an absorption detector, a visible light imaging unit, a signal processing unit, a central control board, a power supply assembly and a display screen, wherein the radiation source, the scattering detector, the absorption detector, the visible light imaging unit, the signal processing unit, the central control board, the power supply assembly and the display screen are arranged in the shell;
wherein the radiation source is used for generating a radiation beam; the scattering detector is provided with a plurality of paths, and the plurality of paths of scattering detector arrays are arranged 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 and correspondingly arranged with the plurality of paths of scattering detectors, and the plurality of paths of absorption detector arrays are arranged 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 the 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 presenting images reconstructed by the central control panel.
2. The multimode compton imaging detection apparatus of claim 1 wherein: the radiation source is a Spindt line array radiation source, and the Spindt line array radiation source is positioned between the two scattering detector arrays and is arranged in parallel with the longitudinal direction of the scattering detector arrays.
3. The multimode compton imaging detection apparatus of claim 2 wherein: the Spindt line array ray source comprises a substrate and a plurality of electron emitters, the electron emitters are arranged on the substrate in an array mode, the electron emitters are electrically connected with a ray controller, the ray controller controls the electron emitters to periodically emit and close, the electron emitters alternately generate flying spot ray beams, and the flying spot ray beams act with an object to be measured to generate scattered photons.
4. The multimode compton imaging detection apparatus of claim 1 wherein: 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 multimode compton imaging detection apparatus of claim 4 wherein: the periphery of the first scintillation crystal and the periphery of the second scintillation crystal are respectively provided with a shielding layer and a reflecting layer;
the inside of the first light cone and the inside of the second light cone are respectively coated with a specular reflection layer, and the specular reflection layers are used for lossless transmission of optical signals;
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.
6. The multimode compton imaging detection apparatus of claim 1 wherein: 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 sequentially connected.
7. The multimode compton imaging detection apparatus of claim 1 wherein: 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.
8. The multimode compton imaging detection apparatus of claim 1 wherein: the scatter detector and the absorption detector are both semiconductor detectors.
9. The multimode compton imaging detection apparatus of claim 1 wherein: the detection device further includes: and the storage unit is connected with the central control board and used for storing the final detection result.
10. Use of a multimode compton imaging detection device according to any one of claims 1 to 9, characterized in that: the detection device is applied to imaging detection of organic contraband and screening and positioning detection of radioactive nuclides.
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