CN114942468B - Method and device for non-contact rapid detection of special nuclear material - Google Patents
Method and device for non-contact rapid detection of special nuclear material Download PDFInfo
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- CN114942468B CN114942468B CN202210566802.3A CN202210566802A CN114942468B CN 114942468 B CN114942468 B CN 114942468B CN 202210566802 A CN202210566802 A CN 202210566802A CN 114942468 B CN114942468 B CN 114942468B
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- 239000011824 nuclear material Substances 0.000 title claims abstract description 73
- 238000001514 detection method Methods 0.000 title claims abstract description 66
- 238000000034 method Methods 0.000 title claims abstract description 16
- 239000012621 metal-organic framework Substances 0.000 claims abstract description 66
- 238000006243 chemical reaction Methods 0.000 claims abstract description 46
- 239000000463 material Substances 0.000 claims abstract description 37
- 239000000126 substance Substances 0.000 claims abstract description 29
- 239000011159 matrix material Substances 0.000 claims abstract description 24
- 230000004992 fission Effects 0.000 claims abstract description 18
- 239000011148 porous material Substances 0.000 claims description 11
- 239000012634 fragment Substances 0.000 claims description 10
- 238000010168 coupling process Methods 0.000 claims description 7
- 238000005859 coupling reaction Methods 0.000 claims description 7
- 230000008878 coupling Effects 0.000 claims description 5
- 238000004020 luminiscence type Methods 0.000 claims description 5
- 230000003287 optical effect Effects 0.000 claims description 5
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 4
- 229910052710 silicon Inorganic materials 0.000 claims description 4
- 239000010703 silicon Substances 0.000 claims description 4
- 239000003822 epoxy resin Substances 0.000 claims description 3
- 229920000647 polyepoxide Polymers 0.000 claims description 3
- 239000007787 solid Substances 0.000 claims description 3
- 238000004806 packaging method and process Methods 0.000 claims description 2
- 238000012216 screening Methods 0.000 abstract description 10
- 230000002269 spontaneous effect Effects 0.000 abstract description 4
- 229910052751 metal Inorganic materials 0.000 description 9
- 239000002184 metal Substances 0.000 description 9
- 125000004435 hydrogen atom Chemical group [H]* 0.000 description 7
- 238000010586 diagram Methods 0.000 description 6
- 230000035945 sensitivity Effects 0.000 description 5
- 230000007613 environmental effect Effects 0.000 description 4
- 238000012546 transfer Methods 0.000 description 4
- 230000009471 action Effects 0.000 description 3
- 230000005855 radiation Effects 0.000 description 3
- 239000000758 substrate Substances 0.000 description 3
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 230000035515 penetration Effects 0.000 description 2
- 229910052778 Plutonium Inorganic materials 0.000 description 1
- 229910052770 Uranium Inorganic materials 0.000 description 1
- 230000003321 amplification Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 238000005538 encapsulation Methods 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 238000003384 imaging method Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- OYEHPCDNVJXUIW-UHFFFAOYSA-N plutonium atom Chemical compound [Pu] OYEHPCDNVJXUIW-UHFFFAOYSA-N 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- 238000001228 spectrum Methods 0.000 description 1
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- 230000001960 triggered effect Effects 0.000 description 1
- JFALSRSLKYAFGM-UHFFFAOYSA-N uranium(0) Chemical compound [U] JFALSRSLKYAFGM-UHFFFAOYSA-N 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01T—MEASUREMENT OF NUCLEAR OR X-RADIATION
- G01T3/00—Measuring neutron radiation
- G01T3/06—Measuring neutron radiation with scintillation detectors
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E30/00—Energy generation of nuclear origin
- Y02E30/30—Nuclear fission reactors
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- Measurement Of Radiation (AREA)
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Abstract
The invention relates to a nuclear material detection method and device, in particular to a non-contact type rapid detection method and device for special nuclear materials, which solve the technical problem that the conventional neutron detector is difficult to effectively realize the requirements of high-efficiency detection and high-sensitivity detection on neutrons after moderation. According to the method for non-contact rapid detection of the special nuclear material, provided by the invention, neutrons released by spontaneous fission of the nuclear material are detected by combining the metal organic framework scintillator with the fission substances containing 235 U, so that the primary screening, screening and detection of the nuclear material are realized. The device comprises a transparent matrix, a metal organic framework scintillator, a fissile material containing 235 U, a photoelectric conversion device and a signal amplitude discrimination circuit; the method is used for detecting and screening the sensitive nuclear material wrapped or specially shielded by a large amount of cargoes.
Description
Technical Field
The invention relates to a nuclear material detection method and device, in particular to a non-contact type rapid detection method and device for special nuclear materials, which are suitable for detecting and screening sensitive nuclear materials wrapped or specially shielded by a large amount of cargoes.
Background
The development of detection and detection techniques for special nuclear materials (Special Nuclear Material, SNM) is of great importance in preventing the diffusion of nuclear devices, in combating terrorist nuclear threats, etc. Detection of heavy shielded special nuclear materials (such as plutonium or uranium) in containers loaded with large amounts of cargo presents a significant technical challenge. Detection of such nuclear materials using gamma rays is not feasible because of the low energy and flux of gamma rays released by the particular nuclear material, while also being easily shielded by high atomic number (high Z) materials. Due to the strong neutron penetration capability and the difficulty of being completely shielded, it is feasible to use neutron detection to achieve special nuclear material detection. However, the neutron is slowed down and partial direction and energy spectrum information are lost due to the heavy shielding, so that the technical requirements for the neutron detection method and device are high.
The special nuclear material can spontaneously fission and release neutrons, which are not charged, have a strong penetration capacity, and are difficult to completely shield, so that the special nuclear material can be detected even if it is well concealed in a well shielded cargo container. The detection of the escaped neutrons after the shielding material is slowed down requires a large number of neutron detectors with low cost, high detection efficiency and high sensitivity. However, currently, the 3 He tube material for neutron detection is short, expensive and insufficient in supply, the BF 3 detector and the liquid scintillator are toxic and flammable, the 10 B counter tube has low detection efficiency, and the requirements of low cost, high efficiency and high sensitivity of special nuclear materials cannot be met.
The scintillation detection method is one of important methods for realizing neutron detection, and has the characteristics of a two-stage amplification structure of a scintillator and a photoelectric device, so that the scintillation detection method has high sensitivity to neutrons. The scintillator material can be very large in size, and can be up to several centimeters to several meters in thickness, which is significantly higher than the thickness of the semiconductor sensitive area, and is the first choice for realizing high neutron detection efficiency. In recent years, metal organic framework scintillators are commonly used in medical human imaging research, but have not been reported in neutron detection and special nuclear material detection.
Disclosure of Invention
The invention aims to solve the technical problem that the conventional neutron detector is difficult to effectively realize the requirements of high-efficiency detection and high-sensitivity detection on the moderated neutrons, and provides a non-contact rapid detection method and device for special nuclear materials, so as to realize the primary detection of the special nuclear materials.
In order to solve the technical problems, the invention adopts the following technical scheme:
The non-contact method for rapidly detecting the special nuclear material is characterized by comprising the following steps of:
1) Filling a 235 U-containing fissile material into the pores of the metal organic framework scintillator;
2) Arranging a metal organic framework scintillator on a transparent matrix to obtain a light-emitting device;
3) Placing the light-emitting device obtained in the step 2) on the periphery of the special nuclear material to be detected, so that the light-emitting device and neutrons generated in the special nuclear material to be detected undergo nuclear fission reaction to generate secondary charged substances;
4) Transmitting energy of the secondary charged substance to a light emitting unit in the metal-organic frame scintillator, so that the metal-organic frame scintillator emits visible light;
5) Converting the visible light emitted in the step 4) into an electric signal by using a photoelectric conversion device;
6) The electric signal is input into a signal amplitude discrimination circuit to discriminate and record neutron signals, and then the special nuclear material is detected.
Further, in step 2), the fissile material containing 235 U is fissile material containing 235UO2.
Further, in step 3), the secondary charged species are fission fragments or protons.
Further, a step of packaging the metal organic frame scintillator is further included between the step 2) and the step 3).
Meanwhile, the invention also provides a device for non-contact type rapid detection of special nuclear materials, which is used for realizing the method for non-contact type rapid detection of special nuclear materials, and is characterized in that: the device comprises a transparent matrix, a metal organic framework scintillator, a fissile material containing 235 U, a photoelectric conversion device and a signal amplitude discrimination circuit;
a fissile material containing 235 U is arranged in the pores of the metal organic framework scintillator;
the metal organic framework scintillator is arranged on the transparent matrix or dispersed in the transparent matrix, and the metal organic framework scintillator and the transparent matrix form a light-emitting device;
the photoelectric conversion device is arranged on the light-emitting path of the light-emitting device;
The signal amplitude discrimination circuit is connected with the photoelectric conversion device.
Further, the fissile material containing 235 U is a fissile material containing 235UO2.
Further, the light-reflecting layer is also included;
The photoelectric conversion device is arranged on one side surface of the metal organic framework scintillator;
the reflective layer is disposed on the remaining five sides of the metal-organic frame scintillator.
Further, the photoelectric conversion device further comprises an optical coupling assembly, wherein the optical coupling assembly is arranged between the metal organic framework scintillator and the photoelectric conversion device.
Further, the transparent matrix is a solid transparent matrix, and the material of the transparent matrix is epoxy resin;
The luminescence wavelength of the metal organic framework scintillator is more than 440nm;
The photoelectric conversion device is an arrayed silicon PM photoelectric conversion device;
the signal amplitude discrimination circuit is a high-frequency signal amplitude discrimination device.
Compared with the prior art, the technical scheme of the invention has the beneficial effects that:
1. According to the method for non-contact rapid detection of the special nuclear material, provided by the invention, neutrons released by spontaneous fission of the nuclear material are detected by combining the metal organic framework scintillator with the fission substances containing 235 U, so that the primary screening, screening and detection of the nuclear material are realized.
2. According to the invention, the holes of the metal organic framework scintillator are filled with the fissile substances containing 235 U and hydrogen atoms in the metal organic framework scintillator, so that the slowdown and detection of fissile neutrons released by nuclear materials can be realized at the same time, and a high signal-to-noise ratio can be obtained by combining a high-frequency signal amplitude screening device; is expected to be used in containers for loading a large amount of cargoes, and is used for detecting effective detection of special nuclear materials of heavy shielding.
3. The hydrogen atoms in the metal organic framework scintillator and the metal organic framework scintillator containing 235 U of fissile substances are neutron detection mediums, after neutron is slowed down, the neutrons can react with the fissile substances containing 235 U to release secondary charged substances (high-energy fissile fragments), the secondary charged substances transfer energy to a light-emitting unit in the metal organic framework scintillator, so that the light-emitting unit emits visible light, the visible light is converted into electric signals through a photoelectric conversion device, the electric signals enter a high-frequency signal amplitude discrimination device, and the high-frequency signal amplitude discrimination device can effectively discriminate and record large-amplitude signals of the fissile fragments caused by the neutrons.
4. Because the metal organic framework scintillator contains hydrogen atoms and the pores of the metal organic framework scintillator are filled with fissile substances containing 235 U, the position of the secondary charged substances is close to organic molecules or pores of the metal organic framework scintillator and is only within a few nanometers, so that high-efficiency and rapid energy transfer can be realized, and the metal organic framework scintillator can obtain high luminous efficiency under the neutron action; the luminous wavelength of the metal organic framework scintillator is more than 440nm, and the metal organic framework scintillator can be matched with most photoelectric conversion devices on the market, so that high photoelectric conversion efficiency is realized. Therefore, the special nuclear material detection device based on the metal organic framework scintillator can realize effective detection of neutrons.
5. The invention can realize high signal-to-noise ratio. The energy of fission fragments released by fission substances containing 235 U is very high, the average energy is more than 40MeV and is far higher than the energy of gamma rays released by special nuclear materials, alpha particles released by spontaneous decay of 235 U and the like, so that the signal amplitude generated by the neutron-induced fission fragments is far higher than the signal amplitude of radiation background interference and environmental interference, a signal amplitude discrimination circuit is selected, and a large-amplitude signal triggered by neutrons is selected and recorded, thereby realizing high signal-to-noise ratio.
6. The method is suitable for detecting the shielding post-nuclear material. The neutron released by the special nuclear material has strong penetrating capability, can penetrate the goods, shielding materials and the like wrapping the special nuclear material, and can be effectively detected by the device for non-contact rapid detection of the special nuclear material. The invention is suitable for detecting the nuclear material wrapped by the shielding material and detecting the nuclear material wrapped by the goods in the large container.
7. The non-contact rapid detection device for special nuclear materials has stable performance and is little affected by environment. The metal organic frame scintillator has strong irradiation stability, can stably convert neutron signals into visible light when used for a long time, has good environmental stability, has luminescence characteristics which are not changed along with the influence of humidity, oxygen fluctuation and the like in the environment, and can be enhanced after the metal organic frame scintillator is packaged.
8. The invention is non-contact nuclear material detection, does not need an additional radiation source, and realizes nuclear material screening by detecting the decay released neutrons of the nuclear material.
9. And (5) detecting the rapid nuclear material. The metal organic frame has fast scintillation and luminescence decay time and is of sub-nanometer level, so the neutron detection speed is high; the thickness of the metal organic frame flicker can reach a plurality of centimeters, and the PM photoelectric conversion device of the array silicon is combined, so that the neutron detection can be realized with high efficiency, and the detection efficiency is high; the metal organic frame scintillators can wrap the reflecting layer, can be closely contacted with the photoelectric conversion device or can be separated from the photoelectric conversion device, and the couplant material is added between the metal organic frame scintillators and the photoelectric conversion device, so that the light transmission characteristic can be optimized, and the neutron detection sensitivity can be further improved.
Drawings
FIG. 1 is a schematic diagram of a non-contact apparatus for rapidly detecting a specific nuclear material according to an embodiment of the present invention;
FIG. 2 is a schematic diagram illustrating an embodiment of a device for non-contact rapid detection of a specific nuclear material according to the present invention;
FIG. 3 is a schematic diagram of a method for non-contact rapid detection of a particular nuclear material according to one embodiment of the present invention;
FIG. 4 is a schematic diagram of screening neutron signals according to an embodiment of a method for non-contact rapid detection of special nuclear materials.
The reference numerals in the drawings are:
1-metal organic frame scintillators, 2-photoelectric conversion devices, 3-signal amplitude discrimination circuits, 4-cargoes, 5-special nuclear materials, 6-shielding materials, 7-containers, 8-neutrons and 9-non-contact rapid detection devices for the special nuclear materials.
Detailed Description
The following description of the embodiments of the present invention will be made apparent and complete in conjunction with the accompanying drawings, in which it is evident that the embodiments described are some, but not all embodiments of the present invention. Based on the technical solutions of the present invention, all other embodiments obtained by a person skilled in the art without making any creative effort fall within the protection scope of the present invention.
Example 1
Referring to fig. 2 and 3, a method for non-contact rapid detection of special nuclear materials comprises the following steps:
1) Filling the pores of the metal organic framework scintillator 1 (i.e., the MOF scintillator) with a fissile material containing 235 U;
2) Disposing the metal-organic frame scintillator 1 on a transparent substrate (the metal-organic frame scintillator 1 may be uniformly dispersed in the transparent substrate in other embodiments) to obtain a light-emitting device;
3) Placing the light emitting device obtained in the step 2) around the special nuclear material 5 to be detected, so that the light emitting device and neutrons 8 generated in the special nuclear material 5 to be detected undergo nuclear fission reaction to generate secondary charged substances;
4) Transmitting energy of the secondary charged substance to the light emitting unit in the metal-organic frame scintillator 1, causing the metal-organic frame scintillator 1 to emit visible light;
5) Converting visible light into an electrical signal by the photoelectric conversion device 2;
6) The electric signal obtained in the step 5) is input into a signal amplitude discrimination circuit 3, and neutron 8 signals are discriminated and recorded.
The MOF scintillator presents a special structure, neutrons 8 undergo nuclear fission reaction with 235 U-containing fissile substances in the MOF scintillator and nuclear recoil action with hydrogen atoms in the MOF scintillator to generate secondary charged substances, the secondary charged substances are fissile fragments or protons, and the secondary charged substances transmit energy to a light-emitting unit of the MOF scintillator so as to emit visible light. Because the secondary charged substance is generated in the pore canal or the pore of the MOF scintillator, the secondary charged substance is very close to the light-emitting unit (namely organic molecules) of the MOF scintillator within 1 nanometer, so that the secondary charged substance can rapidly and effectively transfer energy to the light-emitting unit, and the high light-emitting efficiency of the MOF scintillator under the action of neutrons 8 is realized. The luminescence wavelength of the MOF scintillating material is more than 440nm, and the MOF scintillating material can be matched with most photoelectric conversion devices 2 on the market to realize high photoelectric conversion efficiency, so that the special nuclear material detection device based on the metal-organic framework scintillator 1 can realize effective detection of neutrons 8.
In the embodiment, the holes of the metal-organic framework scintillator 1 are filled with the fissile substances containing 235UO2, and the organic molecules of the metal-organic framework scintillator 1 and the hydrogen atoms in the metal-organic framework scintillator 1 are the moderator of neutrons 8, so that the neutrons 8 and the hydrogen atoms are moderated after collision for a plurality of times, and the energy is reduced;
The fissile material containing 235UO2 and hydrogen atoms of the metal organic framework scintillator 1 are the detection medium of neutrons 8; when the neutrons 8 are moderated, the neutrons 8 will react with the 235UO2 -containing fissile material in the metal-organic framework scintillator 1, which will have a larger cross section for nuclear reaction and a higher sensitivity to the neutrons 8. The nuclear reaction or nuclear recoil releases secondary charged substances (the secondary charged substances are fission fragments or protons and the like), the secondary charged substances transfer energy to a light-emitting unit in the metal organic framework scintillator 1, so that the secondary charged substances emit visible light, the visible light is converted into electric signals through the photoelectric conversion device 2, the electric signals enter the signal amplitude discrimination circuit 3, large signals of the fission fragments can be effectively discriminated and recorded by the signal amplitude discrimination circuit 3, a neutron 8 signal schematic diagram shown in fig. 4 is obtained, a dotted line is a neutron 8 discrimination threshold value, neutrons 8 can be seen from the diagram, and a neutron 8 signal is above the dotted line of the neutron 8 discrimination threshold value.
As shown in fig. 1, the present invention further provides a device for non-contact rapid detection of a special nuclear material, which is used for implementing the above-mentioned method for non-contact rapid detection of a special nuclear material, and comprises a transparent substrate, a metal-organic framework scintillator 1, a fissile material containing 235 U, a photoelectric conversion device 2 and a signal amplitude discrimination circuit 3;
a fissile material containing 235 U is arranged in the pores of the metal organic framework scintillator 1;
The metal organic framework scintillator 1 is arranged on the transparent matrix or dispersed in the transparent matrix, and the metal organic framework scintillator 1 and the transparent matrix form a light-emitting device;
the photoelectric conversion device 2 is arranged on the light-emitting path of the metal organic framework scintillator 1;
The signal amplitude discrimination circuit 3 is connected to the photoelectric conversion device 2.
In the embodiment, the metal-organic framework scintillator 1 has a rectangular structure, and the wavelength of light emitted by the metal-organic framework scintillator is longer than 440nm; one side surface of the metal-organic framework scintillator 1 is arranged opposite to the photoelectric conversion device 2, and the other five side surfaces of the metal-organic framework scintillator 1 are wrapped with reflecting layers. The transparent matrix is a solid transparent matrix (in other embodiments, the metal organic frame scintillator 1 can be uniformly diffused in the transparent matrix), the size of the transparent matrix can reach several centimeters, and the material is epoxy resin; the photoelectric conversion device 2 is a combined array silicon PM device, and the size of the photoelectric conversion device is far lower than that of a photomultiplier tube and the like; the signal amplitude discrimination circuit 3 is a high-frequency signal amplitude discrimination device. An optical coupling assembly may also be provided, in particular between the metal-organic frame scintillator 1 and the photoelectric conversion device 2. Wherein the metal-organic frame scintillator 1 is in close contact with the photoelectric conversion device 2 (the metal-organic frame scintillator 1 and the photoelectric conversion device 2 may be separated in other embodiments), the effect of detecting neutrons 8 is better when in close contact, and the effect can be enhanced when a photo-coupling component (or photo-coupling material) is used.
The energy of fission fragments released by fission substances containing 235 U initiated by neutrons 8 is very high, the average energy is more than 40MeV and is far higher than the energy of gamma rays released by special nuclear materials 5, alpha particles released by spontaneous decay of 235 U and the like, so that the signal amplitude generated by neutrons 8 is far higher than the signal amplitude of radiation background interference and environmental interference, a high-frequency signal amplitude screening device is selected, a large-amplitude response signal initiated by neutrons 8 is selected and recorded, and ultra-high signal-to-noise ratio can be realized.
The device can also be used for detecting the container 7 with the special nuclear material 5 and the loaded cargoes stored in a large amount of cargoes 4, wherein the container 7 is wrapped by a shielding material with high atomic number, and the device 9 for quickly detecting the special nuclear material in a non-contact manner can realize effective detection of the special nuclear material 5 in a heavy shielding manner.
Example two
The difference between the second embodiment and the first embodiment is that after the pores of the metal-organic framework scintillator 1 are filled with the fissile material containing 235 U, the metal-organic framework scintillator 1 is encapsulated by using a transparent film (in other embodiments, the transparent film can also be encapsulated by using a reflective film, and the reflective film is arranged on a non-light-emitting side), after encapsulation, the metal-organic framework scintillator 1 can stably convert the neutron 8 signal into visible light when being used for a long time, and has good environmental stability, and the light-emitting characteristic is not degraded along with the influence of humidity, oxygen fluctuation and the like in the environment.
The remainder of the second embodiment is the same as that of the first embodiment.
The foregoing description is only illustrative of the present invention and is not intended to limit the scope of the invention, and all equivalent structural changes made by the present invention and the accompanying drawings, or direct or indirect application in other related technical fields, are included in the scope of the present invention.
Claims (7)
1. A method for non-contact rapid detection of special nuclear materials, comprising the steps of:
1) Filling a 235 U-containing fissile material into the pores of the metal organic framework scintillator (1);
The fissile material containing 235 U is the fissile material containing 235UO2;
2) Arranging a metal organic framework scintillator (1) on a transparent matrix to obtain a light-emitting device;
3) Placing the light-emitting device obtained in the step 2) around the special nuclear material (5) to be detected, and enabling the light-emitting device and neutrons (8) generated in the special nuclear material (5) to be detected to undergo nuclear fission reaction to generate secondary charged substances;
The secondary charged species are fission fragments or protons;
4) Transmitting energy of the secondary charged substance to a light emitting unit in the metal-organic frame scintillator (1), so that the metal-organic frame scintillator (1) emits visible light;
5) Converting the visible light emitted in the step 4) into an electric signal by using a photoelectric conversion device (2);
6) The electric signal is input into a signal amplitude discrimination circuit (3) to discriminate and record neutron (8) signals, and then the special nuclear material (5) is detected.
2. A method for non-contact rapid detection of specialty nuclear materials according to claim 1, wherein:
The step of packaging the metal organic framework scintillator (1) is further included between the step 2) and the step 3).
3. A device for non-contact rapid detection of special nuclear material, for realizing a method for non-contact rapid detection of special nuclear material according to any one of claims 1-2, characterized in that: comprises a transparent matrix, a metal organic framework scintillator (1), a fissile material containing 235 U, a photoelectric conversion device (2) and a signal amplitude discrimination circuit (3);
The fissile material containing 235 U is arranged in the pores of the metal organic framework scintillator (1);
the metal organic framework scintillator (1) is arranged on the transparent matrix or dispersed in the transparent matrix, and the metal organic framework scintillator (1) and the transparent matrix form a light-emitting device;
the photoelectric conversion device (2) is arranged on a light-emitting light path of the light-emitting device;
The signal amplitude discrimination circuit (3) is connected with the photoelectric conversion device (2).
4. A device for the non-contact rapid detection of particularly sensitive materials as claimed in claim 3, wherein: the fissile material containing 235 U is the fissile material containing 235UO2.
5. The device for non-contact rapid detection of special nuclear materials according to claim 4, wherein: the light reflecting layer is also included;
The photoelectric conversion device (2) is arranged on one side surface of the metal organic framework scintillator (1);
The reflecting layer is arranged on the other side surfaces of the metal organic framework scintillator (1).
6. The device for non-contact rapid detection of special nuclear materials according to claim 5, wherein: the photoelectric conversion device further comprises an optical coupling assembly, wherein the optical coupling assembly is arranged between the metal organic framework scintillator (1) and the photoelectric conversion device (2).
7. A device for the non-contact rapid detection of special nuclear materials according to any one of claims 3 to 6, characterized in that:
The transparent matrix is a solid transparent matrix, and the material of the transparent matrix is epoxy resin;
the luminescence wavelength of the metal organic framework scintillator (1) is more than 440nm;
The photoelectric conversion device (2) is an arrayed silicon PM photoelectric conversion device;
the signal amplitude discrimination circuit (3) is a high-frequency signal amplitude discrimination device.
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| CN103698801A (en) * | 2013-11-29 | 2014-04-02 | 西北核技术研究所 | Multi-layer scintillation detector and measurement method for high-energy proton and neutron energy spectrum measurement |
| CN106324655A (en) * | 2015-06-30 | 2017-01-11 | 中国辐射防护研究院 | Plastic scintillator doped with neutron-sensitive material uranium and method thereof for measuring thermal neutrons |
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| US20050105665A1 (en) * | 2000-03-28 | 2005-05-19 | Lee Grodzins | Detection of neutrons and sources of radioactive material |
| US7999236B2 (en) * | 2007-02-09 | 2011-08-16 | Mropho Detection, Inc. | Dual modality detection system of nuclear materials concealed in containers |
| EP2287636B1 (en) * | 2008-05-12 | 2019-10-23 | Tsinghua University | Method and system for inspecting special nuclear material |
| US9321957B2 (en) * | 2013-09-16 | 2016-04-26 | Saint-Gobain Ceramics & Plastics, Inc. | Scintillator and radiation detector including the scintillator |
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| CN113219518A (en) * | 2021-05-08 | 2021-08-06 | 西北核技术研究所 | Radiation detection device and detection method based on perovskite scintillator |
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| CN103698801A (en) * | 2013-11-29 | 2014-04-02 | 西北核技术研究所 | Multi-layer scintillation detector and measurement method for high-energy proton and neutron energy spectrum measurement |
| CN106324655A (en) * | 2015-06-30 | 2017-01-11 | 中国辐射防护研究院 | Plastic scintillator doped with neutron-sensitive material uranium and method thereof for measuring thermal neutrons |
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