CN110579137B - Thermal neutron analysis mine detection device based on deuterium and deuterium neutron generator - Google Patents
Thermal neutron analysis mine detection device based on deuterium and deuterium neutron generator Download PDFInfo
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- CN110579137B CN110579137B CN201910868032.6A CN201910868032A CN110579137B CN 110579137 B CN110579137 B CN 110579137B CN 201910868032 A CN201910868032 A CN 201910868032A CN 110579137 B CN110579137 B CN 110579137B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F41—WEAPONS
- F41H—ARMOUR; ARMOURED TURRETS; ARMOURED OR ARMED VEHICLES; MEANS OF ATTACK OR DEFENCE, e.g. CAMOUFLAGE, IN GENERAL
- F41H11/00—Defence installations; Defence devices
- F41H11/12—Means for clearing land minefields; Systems specially adapted for detection of landmines
- F41H11/13—Systems specially adapted for detection of landmines
- F41H11/136—Magnetic, electromagnetic, acoustic or radiation systems, e.g. ground penetrating radars or metal-detectors
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N23/00—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00
- G01N23/005—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00 by using neutrons
Abstract
The invention discloses a thermal neutron analysis mine detection device based on a deuterium and deuterium neutron generator. The device comprises a low-energy neutron absorber, a lead shield, a gamma detector, a source intensity monitoring detector, a neutron reflector, a neutron generator and a neutron moderator. The low-energy neutron absorber, the lead shield and the gamma detector are sequentially wrapped from outside to inside to form a detection unit with the lower end close to the neutron generator and the upper end far away from the neutron generator; the neutron generator is positioned in the center of the device, the neutron reflector wraps the side surface of the neutron generator, the neutron moderating body is tightly attached to the position right below the neutron generator, and the four detection units are uniformly and symmetrically distributed in four directions of the side surface of the neutron generator; the source intensity monitoring detector is embedded into the reflector from the top. The device adopts deuterium and deuterium neutron generator as neutron source and adopts LaBr3And the (Ce) detector is used as a gamma detector, and the rapid detection and accurate identification of the mine target can be realized through the detection of the content abnormality of the nitrogen element.
Description
Technical Field
The invention belongs to the technical field of nuclear radiation detection, particularly relates to the technical field of thermal neutron analysis and gamma detection, and particularly relates to a thermal neutron analysis mine detection device based on a deuterium-deuterium neutron generator.
Background
A thermal neutron analysis mine is a new mine detection method using thermal neutrons as probes to detect explosives, and its principle is to use thermal neutrons and mine explosives14Generation of N element (a)n，γ) Reaction, i.e.n(thermal)+14N→15N* →15N+γ(10.83 MeV), the characteristic gamma ray intensity with the energy of 10.83 MeV generated by the method can be used for representing whether the tested object contains explosives or not and information such as explosive content. The thermal neutron analysis mine detection technology is characterized in that a target object is identified based on the content of nitrogen elements, and the thermal neutron analysis mine detection technology has the advantages of high reliability, low false alarm rate and easiness in implementation, and is particularly suitable for application scenes of vehicle-mounted mine detection.
Japan, Italy and Canada are leading to the world in the field of research on thermal neutron analysis mine detection technology, and practice has been developedA mine detection system for analyzing thermal neutrons in a usable vehicle. The mine detection system developed in Japan adopts a deuterium-deuterium neutron generator as a neutron source and adopts a combined structure of wrapping a NaI (Tl) detector outside a BGO detector as a gamma detector, so that the incident neutron intensity and the induced gamma ray measurement signal-to-noise ratio are improved; the mine detection systems developed in Italy and Canada all use radionuclides252Cf is used as a neutron source, and four NaI (Tl) detector arrays are used as gamma detectors, so that the melamine and the Tanke mine can be effectively detected. Although the conventional thermal neutron analysis mine detection system in international inspection can realize effective detection on certain specific mines, the problem of long detection time still exists. To solve this problem, on the one hand, the incident neutron intensity needs to be continuously increased, and on the other hand, a gamma detector with better performance needs to be selected.
The research of the thermal neutron analysis mine exploring technology in China also has a history of nearly ten years, and the research unit is mainly the nuclear physics and chemical research institute of the Chinese engineering physics institute and the liberation military 63983 army of Chinese people. The group of the applicant is dedicated to the research of neutron challenge mine detection technology for a long time, and develops a series of mine detection technologies and mine detection identification algorithms, including specific technologies of thermal neutron analysis mine detection, pulse fast thermal neutron analysis mine detection, neutron backscattering mine detection and the like, and specific algorithms of a 3 sigma decision function, automatic searching of a characteristic peak energy region, simple positioning of a mine target, probability matrix source tracing imaging and the like. Meanwhile, with the development of the development technology of the domestic neutron generator, the deuterium neutron generator is feasible to be applied to the thermal neutron analysis mine detection. The deuterium-deuterium neutron generator specially developed for the thermal neutron analysis mine detection technology can obtain higher neutron yield and can meet the requirement of the thermal neutron analysis mine detection technology on neutron intensity. And, compared with the conventional one252The Cf isotope neutron source and the neutron emitting beam of the deuterium neutron generator can be adjusted and closed, and the radiation safety is higher.
Therefore, in order to accelerate the detection speed of the mine buried in the soil and reduce the radiation dose of operators, it is necessary to develop a thermal neutron analysis mine detection device based on a deuterium and deuterium neutron generator.
Disclosure of Invention
The invention aims to solve the technical problem of providing a thermal neutron analysis mine detection device based on a deuterium and deuterium neutron generator.
The invention discloses a thermal neutron analysis mine detection device based on a deuterium-deuterium neutron generator, which is characterized in that: the mine detection device comprises a low-energy neutron absorber, a lead shield, a gamma detector, a source intensity monitoring detector, a neutron reflector, a neutron generator and a neutron moderating body;
the neutron generator is a cylinder and is positioned in the center of the whole device, a neutron generator control cabinet is connected with the neutron generator through a cable, the neutron generator control cabinet provides accelerating high voltage and ion source voltage for the neutron generator, the neutron generator control cabinet is connected with a PC terminal through a network cable, and parameter regulation and control are carried out on the neutron generator control cabinet through control software of the PC terminal; the neutron moderating body is in a disc shape and is tightly attached to the right lower part of the neutron generator; the neutron reflector is a hollow cylinder and is tightly wrapped at the outer sides of the neutron generator and the neutron moderating body; the source intensity monitoring detector is a cylinder and is inserted into the neutron reflector from top to bottom, the power supply module of the source intensity monitoring detector provides high voltage for the source intensity monitoring detector, and a pulse signal measured by the source intensity monitoring detector is converted into a digital signal after being analyzed by the signal acquisition and processing module of the source intensity monitoring detector and is transmitted to the PC terminal;
the lead shielding body is a hollow cylinder with a closed bottom surface, and a cavity of the hollow cylinder deviates from the neutron generator, namely the thickness of the lead shielding body close to one side of the neutron generator is larger than that of the lead shielding body far away from one side of the neutron generator; the gamma detector is placed in a cavity of the lead shielding body, the gamma detector power supply module provides high voltage and low voltage for the gamma detector, and pulse signals measured by the gamma detector are converted into digital signals after linear amplification and pulse amplitude analysis of the gamma detector signal acquisition and processing module and are transmitted to the PC terminal; the low-energy neutron absorber is wrapped on the side surface and the bottom surface of the lead shielding body;
the low-energy neutron absorber, the lead shield and the gamma detector form a detection unit, the detection unit inclines in the vertical direction, and the inclination direction is that the lower end of the detection unit is close to the neutron generator, and the upper end of the detection unit is far away from the neutron generator; the mine detecting device comprises four detecting units which are uniformly and symmetrically distributed in four directions of the side surface of the neutron generator.
The low-energy neutron absorber is made of cadmium, and the thicknesses of cadmium sheets on the side face and the bottom face of the low-energy neutron absorber are both 1 mm-2 mm.
The lead shielding body is made of old lead, the thickness of the lead shielding body close to one side of the neutron generator is 3 cm-5 cm, the thickness of the lead shielding body far away from one side of the neutron generator is 1 cm-2 cm, and the thickness of the bottom surface of the lead shielding body is 3 mm-5 mm.
The gamma detector adopts LaBr3(Ce) detectors, LaBr3The diameter and height of the (Ce) crystal were both 7.62 cm.
The source intensity monitoring detector adopts3He is proportional to the count tube.
The neutron generator adopts a deuterium-deuterium neutron generator, and the average energy of emitted neutrons is 2.5 MeV.
The neutron generator adopts a single body structure, namely, the sealed neutron tube, the inverter and the multiplier are fixedly packaged in the interior of the neutron generator in an equipotential mode, and No. 45 transformer oil is used as an insulating, moderating and reflecting material.
The neutron reflector is made of high-density polyethylene, and the thickness of the side face of the neutron reflector is 5 cm-8 cm.
The neutron moderating body is made of high-density polyethylene and is 1-4 cm in height.
The thermal neutron analysis mine detection device based on the deuterium and deuterium neutron generator has the following advantages:
first, the use of deuterium neutron generators without any radioactive nuclear material as neutron source, in contrast to conventional deuterium neutron generators252Unlike Cf isotope neutron sources which are always in a radioactive state, deuterium neutron generators only produce radioactivity when in operation, with an exit beam streamAdjustable and closeable, and high radiation safety.
Second, adopt3The He proportional counter tube is used as a source intensity monitoring detector, can monitor the stable state of the beam current emitted by the neutron generator in real time, can be used as the basis for regulating and controlling the parameters of the neutron generator on one hand, and can be used for normalizing and correcting the neutron intensity in a mine detection recognition algorithm on the other hand.
Thirdly, LaBr is adopted3(Ce) Detector as gamma detector, LaBr compared to conventional BGO and NaI (Tl) detectors3The (Ce) detector has the advantages of high energy resolution and short luminescence decay time, and can remarkably improve the measurement signal-to-noise ratio of a 10.83 MeV characteristic peak energy area.
Fourthly, four detector array layouts are carried out based on the structure of deuterium neutron generator, and through system structure design and detector array layout optimization, the source neutron utilization rate and the gamma ray detection efficiency are effectively increased, and through multiple shielding of the gamma detector, the radiation background is remarkably reduced, the measurement signal-to-noise ratio is improved, and rapid detection and accurate identification of the underground mine in the soil can be realized.
According to the thermal neutron analysis mine detection device based on the deuterium-deuterium neutron generator, the deuterium-deuterium neutron generator is used as a neutron source, an emergent beam flow can be adjusted and closed, and the radiation safety is good; with the simultaneous use of LaBr3The (Ce) detector is used as a gamma detector, and has the advantages of high detection efficiency and good energy resolution; through system structure design and detector array layout optimization, effectively increase source neutron utilization ratio and gamma ray detection efficiency to through the multiple shielding to gamma detector, showing and reducing the radiation background, promoting the measurement signal to noise ratio, can realize burying underground mine's quick detection and accurate discernment in the soil.
Drawings
FIG. 1 is a schematic structural diagram of a thermal neutron analysis mine detection device based on a deuterium-deuterium neutron generator according to the present invention;
fig. 2 is a top view of the thermal neutron analysis mine detection device based on the deuterium-deuterium neutron generator of the invention.
Fig. 1 is a sectional view taken along line a-a of fig. 2.
In the figure, 1, a low-energy neutron absorber 2, a lead shield 3, a gamma detector 4, a source intensity monitoring detector power supply module 5, a source intensity monitoring detector 6, a neutron reflector 7, a neutron generator 8, a neutron generator target 9, a neutron moderator 10, a source intensity monitoring detector signal acquisition and processing module 11, a neutron generator control case 12, a gamma detector signal acquisition and processing module 13, a gamma detector power supply module 14, a PC terminal 15, a mine 16 and soil.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be further described in detail with reference to the accompanying drawings and examples.
The thermal neutron analysis mine detection device based on the deuterium-deuterium neutron generator comprises a low-energy neutron absorber 1, a lead shielding body 2, a gamma detector 3, a source intensity monitoring detector 5, a neutron reflector 6, a neutron generator 7 and a neutron moderator 9;
the neutron generator 7 is a cylinder and is positioned in the center of the whole device, the neutron generator control cabinet 11 is connected with the neutron generator 7 through a cable, the neutron generator control cabinet 11 provides accelerating high voltage and ion source voltage for the neutron generator 7, the neutron generator control cabinet 11 is connected with the PC terminal 14 through a network cable, and control software of the PC terminal 14 is used for carrying out parameter regulation and control on the neutron generator control cabinet 11; the neutron moderating body 9 is in a disc shape and is tightly attached to the right lower part of the neutron generator 7; the neutron reflector 6 is a hollow cylinder and is tightly wrapped on the outer sides of the neutron generator 7 and the neutron moderator 9; the source intensity monitoring detector 5 is a cylinder and is inserted into the neutron reflector 6 from top to bottom, the source intensity monitoring detector power supply module 4 provides high voltage for the source intensity monitoring detector 5, and a pulse signal measured by the source intensity monitoring detector 5 is converted into a digital signal after being analyzed by the source intensity monitoring detector signal acquisition and processing module 10 and is transmitted to the PC terminal 14;
the lead shielding body 2 is a hollow cylinder with a closed bottom surface, and a cavity of the hollow cylinder deviates from the neutron generator 7, namely the thickness of the lead shielding body 2 close to the neutron generator 7 is larger than that of the lead shielding body 2 far away from the neutron generator 7; the gamma detector 3 is placed in the cavity of the lead shielding body 2, the gamma detector power supply module 13 provides high voltage and low voltage for the gamma detector 3, and pulse signals measured by the gamma detector 3 are converted into digital signals after linear amplification and pulse amplitude analysis of the gamma detector signal acquisition and processing module 12 and are transmitted to the PC terminal 14; the low-energy neutron absorber 1 is wrapped on the side surface and the bottom surface of the lead shielding body 2;
the low-energy neutron absorber 1, the lead shield 2 and the gamma detector 3 form a detection unit, the detection unit tilts in the vertical direction, and the tilting direction is that the lower end of the detection unit is close to the neutron generator 7 and the upper end of the detection unit is far away from the neutron generator 7; the mine detecting device comprises four detecting units which are uniformly and symmetrically distributed in four directions of the side surface of the neutron generator 7.
The low-energy neutron absorber 1 is made of cadmium, and the thicknesses of cadmium sheets on the side face and the bottom face of the low-energy neutron absorber 1 are both 1 mm-2 mm.
The lead shielding body 2 is made of old lead, the thickness of the lead shielding body 2 close to one side of the neutron generator 7 is 3 cm-5 cm, the thickness of the lead shielding body 2 far away from one side of the neutron generator 7 is 1 cm-2 cm, and the thickness of the bottom surface of the lead shielding body 2 is 3 mm-5 mm.
The gamma detector 3 adopts LaBr3(Ce) detectors, LaBr3The diameter and height of the (Ce) crystal were both 7.62 cm.
The source intensity monitoring detector 5 adopts3He is proportional to the count tube.
The neutron generator 7 adopts a deuterium-deuterium neutron generator, and the average energy of emitted neutrons is 2.5 MeV.
The neutron generator 7 adopts a single body structure, namely, the sealed neutron tube, the inverter and the multiplier are fixedly packaged in the interior of the neutron generator 7 in an equipotential mode, and No. 45 transformer oil is used as an insulating, moderating and reflecting material.
The neutron reflector 6 is made of high-density polyethylene, and the side thickness is 5 cm-8 cm.
The neutron moderating body 9 is made of high-density polyethylene and is 1 cm-4 cm in height.
Example 1
As shown in fig. 1, the thermal neutron analysis mine detection device based on the deuterium-deuterium neutron generator of the embodiment includes a low-energy neutron absorber 1, a lead shield 2, a gamma detector 3, a source intensity monitoring detector power supply module 4, a source intensity monitoring detector 5, a neutron reflector 6, a neutron generator 7, a neutron generator target 8, a neutron moderator 9, a source intensity monitoring detector signal acquisition and processing module 10, a neutron generator control cabinet 11, a gamma detector signal acquisition and processing module 12, a gamma detector power supply module 13, and a PC terminal 14.
The low-energy neutron absorber 1 is tightly wrapped on the outer side of the lead shielding body 2, the low-energy neutron absorber 1 is made of cadmium, and the low-energy neutron absorber 1 has the functions of absorbing low-energy neutrons emitted from a neutron generator 7, penetrating through a neutron reflector 6 and a neutron moderator 9 in a moderating manner, and reflecting back through a mine 15 and soil 16, so that the neutron measurement background generated when the low-energy neutrons enter the gamma detector 3 is reduced; the lead shielding body 2 is sleeved on the outer side of the gamma detector 3, the lead shielding body 2 is made of old lead, and the lead shielding body 2 has the functions of shielding low-energy gamma rays from the low-energy neutron absorber 1, the neutron reflector 6, the neutron moderator 9, the mine 15 and the soil 16 and reducing the gamma measurement background generated when the low-energy gamma rays enter the gamma detector 3; the gamma detector 3 adopts LaBr with the diameter and the height of 7.62 cm3(Ce) detectors, e.g. LaBr model KLB5057 from Kailon, Beijing3The (Ce) detector, the gamma detector 3 is placed in the combined sleeve composed of the low energy neutron absorber 1 and the lead shielding body 2, the gamma detector power supply module 13 provides high voltage and low voltage for the gamma detector 3, in the mine explosive14The 10.83 MeV characteristic gamma rays generated by the N element penetrate through the low-energy neutron absorber 1 and the lead shielding body 2, enter the gamma detector 3 to generate measurement pulses, pulse signals measured by the gamma detector 3 are converted into digital signals after linear amplification and pulse amplitude analysis of the gamma detector signal acquisition and processing module 12, and the digital signals are transmitted to the PCA terminal 14; the low-energy neutron absorber 1, the lead shielding body 2 and the gamma detector 3 sequentially form a detection unit from outside to inside, and the whole mine detection device comprises four detection units which are uniformly and symmetrically distributed in four directions of the side surface of the neutron generator 7; the source intensity monitoring detector 5 adopts3The He proportional counter tube is embedded into the neutron reflector 6 from the top and is positioned outside the neutron generator 7, the power supply module 4 of the source intensity monitoring detector provides high voltage for the source intensity monitoring detector 5, and a pulse signal measured by the source intensity monitoring detector 5 is converted into a digital signal after being analyzed by the signal acquisition and processing module 10 of the source intensity monitoring detector and is transmitted to the PC terminal 14; the neutron reflector 6 is tightly wrapped on the outer sides of the neutron generator 7 and the neutron moderator 9, the neutron reflector 6 is made of high-density polyethylene, and the high-density polyethylene contains a large amount of hydrogen elements, so that the neutron reflector can play a role in scattering neutrons emitted from the neutron generator 7 to the side direction for multiple times and changing paths; the neutron generator 7 can adopt an NT type 54 mm diameter self-targeting ceramic shell sealing neutron tube developed by northeast university of teachers, the sealing neutron tube, an inverter and a multiplier are fixedly packaged in the neutron generator 7 in an equipotential mode by adopting a single structure, meanwhile, insulation, moderation and reflection materials of the neutron generator 7 are integrally designed, namely, 45-th transformer oil is adopted as an insulation medium, hydrogen elements contained in the 45-th transformer oil have certain neutron moderation and neutron reflection functions, the neutron generator 7 is positioned in the center of the whole device, a neutron generator control cabinet 11 provides accelerating high voltage and ion source voltage for the neutron generator 7, and control software of a PC terminal 14 regulates and controls parameters of the neutron generator control cabinet 11; the neutron moderating body 9 is located right below the neutron generator 7 and closely attached to the neutron generator 7, the neutron moderating body 9 is made of high-density polyethylene, and a large amount of hydrogen elements in the high-density polyethylene can play a role in moderating neutrons emitted downwards by the neutron generator 7.
The measurement process of the whole device is as follows: the parameter of the neutron generator control cabinet 11 is regulated and controlled through the neutron generator control software of the PC terminal 14, so that the neutron generator is controlledThe control box 11 supplies an accelerating high voltage and an ion source voltage to the neutron generator 7, thereby generating a neutron outgoing beam current at the neutron generator target 8. Meanwhile, a source intensity monitoring detector 5 is embedded in the top of the reflector 6, a power supply module 4 of the source intensity monitoring detector provides high voltage for the source intensity monitoring detector 5, a pulse signal measured by the source intensity monitoring detector 5 is analyzed by a source intensity monitoring detector signal acquisition and processing module 10 and then converted into a digital signal to be transmitted to a PC terminal 14, the stable state of neutron outgoing beam current is monitored in real time through neutron source intensity monitoring software of the PC terminal 14, and then parameter regulation and control are carried out on a neutron generator control cabinet 11 through neutron generator control software of the PC terminal 14 so that the neutron outgoing beam current is kept stable. After the source neutrons emitted upwards and emitted to the side face are scattered for multiple times by the neutron reflector 6, part of the neutrons are reflected downwards to form reflected neutrons, the reflected neutrons and the source neutrons directly emitted downwards are converted into thermal neutrons through the moderation action of the neutron moderator 9 and the soil 16, and the thermal neutrons enter the landmine 15 and the explosive14Generation of N element (a)n，γ) And reacting to generate a characteristic gamma ray of 10.83 MeV, wherein the characteristic gamma ray penetrates through the low-energy neutron absorber 1 and the lead shielding body 2 and enters the gamma detector 3 to generate a measuring pulse. The gamma detector power supply module 13 provides high voltage and low voltage for the gamma detector 3, and the pulse signal generated by the gamma detector 3 is converted into a digital signal after linear amplification and pulse amplitude analysis of the gamma detector signal acquisition and processing module 12, and is transmitted to the PC terminal 14. Recording the amplitude spectra of all pulse signals through energy spectrum analysis software of the PC terminal 14, finding out the energy region range where the 10.83 MeV characteristic gamma ray is located through energy scales, counting characteristic peaks, finally calculating a mine detection alarm coefficient according to a target identification algorithm, and judging whether a landmine exists in soil or not through abnormal detection of the mine detection alarm coefficient.
Claims (9)
1. A thermal neutron analysis mine detection device based on deuterium and deuterium neutron generator is characterized in that: the mine detection device comprises a low-energy neutron absorber (1), a lead shield (2), a gamma detector (3), a source intensity monitoring detector (5), a neutron reflector (6), a neutron generator (7) and a neutron moderator (9);
the neutron generator (7) is a cylinder and is positioned in the center of the whole device, a neutron generator control cabinet (11) is connected with the neutron generator (7) through a cable, the neutron generator control cabinet (11) provides accelerating high voltage and ion source voltage for the neutron generator (7), the neutron generator control cabinet (11) is connected with a PC terminal (14) through a network cable, and control software of the PC terminal (14) is used for carrying out parameter regulation and control on the neutron generator control cabinet (11); the neutron moderating body (9) is in a disc shape and is tightly attached to the right lower part of the neutron generator (7); the neutron reflector (6) is a hollow cylinder and is tightly wrapped on the outer sides of the neutron generator (7) and the neutron moderator (9); the source intensity monitoring detector (5) is a cylinder and is inserted into the neutron reflector (6) from top to bottom, the power supply module (4) of the source intensity monitoring detector provides high voltage for the source intensity monitoring detector (5), and a pulse signal measured by the source intensity monitoring detector (5) is converted into a digital signal after being analyzed by the source intensity monitoring detector signal acquisition and processing module (10) and is transmitted to the PC terminal (14);
the lead shielding body (2) is a hollow cylinder with a closed bottom surface, a cavity of the hollow cylinder deviates from the neutron generator (7), namely the thickness of the lead shielding body (2) close to one side of the neutron generator (7) is larger than that of the lead shielding body (2) far away from one side of the neutron generator (7); the gamma detector (3) is placed in a cavity of the lead shielding body (2), the gamma detector power supply module (13) provides high voltage and low voltage for the gamma detector (3), and pulse signals measured by the gamma detector (3) are converted into digital signals after linear amplification and pulse amplitude analysis of the gamma detector signal acquisition and processing module (12) and are transmitted to the PC terminal (14); the low-energy neutron absorber (1) is wrapped on the side surface and the bottom surface of the lead shielding body (2);
the low-energy neutron absorber (1), the lead shielding body (2) and the gamma detector (3) form a detection unit, the detection unit inclines in the vertical direction, the inclination direction is that the lower end of the detection unit is close to the neutron generator (7), and the upper end of the detection unit is far away from the neutron generator (7); the mine detecting device comprises four detecting units which are uniformly and symmetrically distributed in four directions of the side surface of the neutron generator (7).
2. The deuterium neutron generator-based thermal neutron analysis mine detection device according to claim 1, wherein: the low-energy neutron absorber (1) is made of cadmium, and the thicknesses of cadmium sheets on the side face and the bottom face of the low-energy neutron absorber (1) are both 1 mm-2 mm.
3. The deuterium neutron generator-based thermal neutron analysis mine detection device according to claim 1, wherein: the lead shielding body (2) is made of old lead, the thickness of one side, close to the neutron generator (7), of the lead shielding body (2) is 3 cm-5 cm, the thickness of one side, far away from the neutron generator (7), of the lead shielding body (2) is 1 cm-2 cm, and the thickness of the bottom surface of the lead shielding body (2) is 3 mm-5 mm.
4. The deuterium neutron generator-based thermal neutron analysis mine detection device according to claim 1, wherein: the gamma detector (3) adopts LaBr3(Ce) detectors, LaBr3The diameter and height of the (Ce) crystal were both 7.62 cm.
5. The deuterium neutron generator-based thermal neutron analysis mine detection device according to claim 1, wherein: the source intensity monitoring detector (5) adopts3He is proportional to the count tube.
6. The deuterium neutron generator-based thermal neutron analysis mine detection device according to claim 1, wherein: the neutron generator (7) adopts a deuterium-deuterium neutron generator, and the average energy of emitted neutrons is 2.5 MeV.
7. The deuterium neutron generator-based thermal neutron analysis mine detection device according to claim 1, wherein: the neutron generator (7) adopts a single structure, namely, the sealed neutron tube, the inverter and the multiplier are fixedly packaged in the interior of the neutron generator (7) in an equipotential mode, and No. 45 transformer oil is used as an insulating, moderating and reflecting material.
8. The deuterium neutron generator-based thermal neutron analysis mine detection device according to claim 1, wherein: the neutron reflector (6) is made of high-density polyethylene, and the side thickness is 5 cm-8 cm.
9. The deuterium neutron generator-based thermal neutron analysis mine detection device according to claim 1, wherein: the neutron moderating body (9) is made of high-density polyethylene and is 1-4 cm in height.
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