CN108535299A - Explosion-proof detection integrated apparatus in high precision - Google Patents

Abstract

The high-precision explosion-proof detection integrated device is an integrated device that uses the prompt gamma ray neutron activation analysis technology to detect and determine the existence of explosives, and has an explosion-proof function. The device consists of an explosion-proof system, a neutron source system, a sample detection system, an energy spectrum analysis system, a shielding protection system, and a mechanical power system. The neutron source is used to excite the characteristic gamma rays of the measured item, and the detector collects gamma rays. As well as energy spectrum measurement, the explosion-proof system has a high energy absorption buffer function, the shielding protection system is used for dose protection of the environment and the human body, and reduces the harm of neutrons to the environment and the human body. The mechanical power system realizes the function of convenient measurement. The present invention uses the signal-to-noise ratio as the device design evaluation criterion, and optimizes the design of the overall device based on a new device evaluation optimization method, so that the device has a higher signal-to-noise ratio, improves the measurement level of the device, and at the same time organically combines the explosion-proof function and the detection function, The device has high safety and is easy to operate.

Description

High-precision explosion-proof detection integrated device

technical field

The invention belongs to the technical field of element detection, and in particular relates to a high-precision explosion-proof detection integrated device.

Background technique

Public safety has been the focus of attention for a long time. How to effectively detect dangerous explosives in luggage and prevent them from causing harm and panic caused by explosions in densely populated areas is an urgent problem to be solved. In airports, stations and other areas, based on X-ray transmission imaging technology, X-ray machines are used to detect luggage and other items, and judge whether there are dangerous explosives in luggage based on the shape and density information of the detected material. Other technologies also include metal detection. technology, millimeter wave detection technology, etc. In view of the explosion hazard of explosives, explosion-proof barrels and explosion-proof blankets are usually set up to prevent the hazards caused by explosions.

At present, in the field of measurement analysis, nuclear analysis technology has become a routine technology. It has many advantages that other analytical techniques do not have. Prompt Gamma-Ray Neutron Activation Analysis (PGNAA, Prompt Gamma-Ray Neutron Activation Analysis) technology uses neutrons to bombard the target nucleus of the measured material, and reacts in a very short time (less than 10 ^-13 s) to emit characteristic gamma rays, by detecting characteristic gamma rays and measuring the intensity of characteristic gamma rays, most nuclides can be qualitatively and quantitatively identified and their content analyzed. Due to its high penetration, non-destructive, on-line in-situ measurement, and high analysis accuracy, it has been widely used in various fields such as social security, industry, environment, and medicine in recent years.

However, the above-mentioned detection technology has deficiencies, X-ray penetration is poor, and it cannot detect deep objects; some instruments are expensive to import, and the cost is high; and the current detection devices do not have explosion-proof functions, even if suspected dangerous goods are detected, they cannot to process.

Therefore, it is really necessary to improve the prior art and devices to fundamentally solve the deficiencies of the prior art and devices.

Contents of the invention

The invention aims at the deficiencies in the prior art, and provides a high-precision explosion-proof detection integrated device.

To achieve the above object, the present invention adopts the following technical solutions:

A high-precision explosion-proof detection integrated device is characterized in that it includes: an explosion-proof system, a neutron source term system, a sample detection system, an energy spectrum analysis system, a shielding protection system, and a mechanical power system; The neutrons are released in the explosion-proof system, the sample detection system receives the characteristic gamma rays excited by the neutrons, the energy spectrum analysis system records the energy spectrum of the gamma rays, and the shielding protection system detects neutrons and gamma rays. Horse rays are shielded, the mechanical power system controls the opening and closing of the device.

In order to optimize the above technical solutions, the specific measures taken also include:

The explosion-proof system includes a decorative shell, an outer steel layer, an energy-absorbing buffer layer, an inner steel layer and reinforcing ribs; the decorative shell forms the outer layer of the barrel body, and the decorative shell, outer steel layer, energy-absorbing buffer layer, and inner steel layer Closely connected sequentially from outside to inside, the reinforcing ribs are installed at the bottom of the outer steel layer.

The neutron source item system includes a neutron generator, a neutron generator power supply control cabinet, a surrounding reflector and an upper reflector; the neutron generator is half-wrapped in an energy-absorbing buffer layer, and the neutron generator The power supply control box is connected with the neutron generator to supply power for the neutron generator. Both the surrounding reflective layer and the upper reflective layer play the role of neutron reflection. The surrounding reflective layer is located on the inner side of the inner steel layer, and the upper reflective layer is located at the barrel cover. .

The sample detection system includes a measurement chamber, a sample holder, a sample and a gamma ray detector; the measurement chamber is located in the surrounding reflective layer, the sample holder is located in the measurement chamber for supporting the sample, and the gamma ray The gamma-ray detector is located in the upper reflective layer. The neutrons released by the neutron generator have a radiation capture reaction with the sample, releasing characteristic gamma-rays. The characteristic gamma-rays enter the gamma-ray detector and are deposited. Ray detector records.

The energy spectrum analysis system includes a multi-channel analyzer and an industrial control computer; the multi-channel analyzer is connected with a gamma ray detector for conversion, storage and transmission of characteristic gamma rays, and the industrial control computer is connected with a multi-channel The analyzers are connected to process the data transmitted by the multi-channel analyzers.

The shielding protection system includes a gamma ray shielding layer, a detector protective layer and an environmental protection layer; the gamma ray shielding layer is located between the surrounding reflective layer and the inner steel layer, and is used to shield the energy-absorbing buffer layer material from neutrons The gamma ray generated by the reaction, the detector protective layer is located between the upper reflective layer and the gamma ray detector, and is used to further shield the gamma ray produced by other structural materials in the device, and the environmental protection layer is located between the decorative shell and the gamma ray detector. Between the outer steel layers, it is used to shield neutrons from entering the surrounding environment.

The mechanical power system includes a mechanical shaft and a motor; the mechanical shaft is connected between the lid and the barrel body, the motors are respectively connected to the mechanical shaft and the industrial control computer, the motor provides power for the mechanical shaft, and the industrial control computer is used for Operate the motor to control the opening and closing of the lid.

The inner diameter of the barrel body is 900mm, the outer diameter is 1030-1060mm, and the height is 850-880mm; the decorative shell is made of stainless steel; the inner steel layer is made of carbon steel, the outer diameter is 916mm, the height is 658mm, the wall thickness is 8mm, and the bottom layer is 8mm thick ;The energy-absorbing buffer layer is made of high-density polyethylene fiber, with an outer diameter of 1014mm, a bottom layer thickness of 176mm, and a wall thickness of 49mm; the outer steel layer is made of carbon steel, with an outer diameter of 1030mm, a bottom layer thickness of 8mm, and a wall thickness of 8mm; the reinforcing rib is carbon steel Material, length 500mm, width 8mm, height 8mm.

The neutron generator is a D-D neutron generator, which produces neutrons with an energy of 2.5MeV; the surrounding reflector is made of graphite with a wall thickness of 160mm; the thickness of the upper reflector is 180mm; the inner diameter of the measuring chamber is 900mm and the height is 650mm; The horse-ray detector is a sodium iodide (NaI) detector with a crystal diameter of 101.6mm and a height of 101.6mm.

The gamma ray shielding layer is made of lead material with a wall thickness of 40mm; the detector protective layer is made of lead material; the environmental protection layer is made of boron-containing polyethylene material with a boron carbide content of 5%.

The beneficial effects of the present invention are:

1. Organically combine the explosion-proof function with the detection function to make up for the defects that the detection device cannot be explosion-proof and the explosion-proof device cannot be detected in the current safety inspection; the explosion-proof material designed in the explosion-proof system can slow down neutrons and scatter neutrons It has an absorption effect, thereby reducing the use of neutron moderating structural materials and shielding structural materials in the device, reducing the noise interference caused by structural materials, and reducing the cost of the device; the structure designed in the detection system increases the wall thickness of the device , can improve the overall explosion-proof performance of the device;

2. The device detects items based on PGNAA technology. In the design of the overall device, the effective signal excited by the sample and the interference noise generated by the reaction of surrounding structural materials and neutrons are considered at the same time. The signal-to-noise ratio is used as the design evaluation standard, and finally the material selection is passed. As well as the design of structural geometry, improve the overall signal-to-noise ratio of the device, and ultimately improve the measurement level of the device;

3. The measuring device chooses the D-D neutron generator as the neutron source, and discards the D-T neutron generator and other isotope neutron sources. Even if an explosion causes the neutron generator to rupture, there will be no radioactive substances in it, and there will be no "nuclear "Leakage" will cause harm to the environment and human body;

In summary, the present invention uses the signal-to-noise ratio as the design evaluation standard, and designs the overall device based on a new device evaluation and optimization method, which improves the measurement level of the device; and the device has both explosion-proof and detection functions, which more effectively protects the public Safety.

Description of drawings

Figure 1 is a schematic diagram of the overall structure of the present invention.

Fig. 2 is a front sectional view of the present invention.

Reference signs are as follows: 1-industrial control computer; 2-motor; 3-neutron generator power supply control chassis; 4-barrel cover; 5-barrel body; 6-neutron generator; 7-multi-channel analyzer; 8 -mechanical shaft; 9-gamma ray detector; 10-detector protection layer; 11-upper reflection layer; 12-decorative shell; 13-environment protection layer; 14-outer steel layer; - Inner steel layer; 17 - Gamma ray shielding layer; 18 - Surrounding reflection layer; 19 - Sample; 20 - Sample holder; 21 - Rib; 22 - Measurement chamber.

Detailed ways

The present invention is described in further detail now in conjunction with accompanying drawing.

The high-precision explosion-proof detection integrated device shown in Figure 1 and Figure 2 includes an explosion-proof system, a neutron source item system, a sample detection system, an energy spectrum analysis system, a shielding protection system and a mechanical power system. The explosion-proof system includes a decorative shell 12, an outer steel layer 14, an energy-absorbing buffer layer 15, an inner steel layer 16, and reinforcing ribs 21. The neutron source item system includes a neutron generator 6, a neutron generator power supply control cabinet 3, and surrounding reflectors. Layer 18, upper reflective layer 11, sample detection system includes measurement chamber 22, sample holder 20, sample 19, gamma ray detector 9, energy spectrum analysis system includes multi-channel analyzer 7, industrial control computer 1, shielding protection system Including a gamma ray shielding layer 17 , a detector protection layer 10 , and an environment protection layer 13 , the mechanical power system includes a mechanical shaft 8 and a motor 2 .

The barrel body 5 has an inner diameter of 900mm, an outer diameter of 1030-1060mm, and a height of 850-880mm; the decorative shell 12 is made of stainless steel; the inner steel layer 16 is made of carbon steel, with an outer diameter of 916mm, a height of 658mm, a wall thickness of 8mm, and a thickness of the bottom layer 8mm; the energy-absorbing buffer layer 15 is made of high-density polyethylene fiber, with an outer diameter of 1014mm, a thickness of the bottom layer of 176mm, and a wall thickness of 49mm; the outer steel layer 14 is made of carbon steel, with an outer diameter of 1030mm, a thickness of the bottom layer of 8mm, and a wall thickness of 8mm; 21 is made of carbon steel, with a length of 500mm, a width of 8mm, and a height of 8mm, located at the bottom of the outer steel layer 14. The explosion-proof system uses carbon steel and high-density polyethylene fibers to absorb and weaken the impact of explosive explosions and prevent fragments from splashing to complete the protection of public safety.

The neutron generator 6 is a D-D neutron generator, which produces neutrons with an energy of 2.5MeV, and the neutron emission direction is 4π direction, half-wrapped in the energy-absorbing buffer layer 15; the energy-absorbing buffer layer 15 is a hydrogen-containing material, which can The energy-absorbing buffer material is used as a neutron moderator to reduce the increase of structural materials, thereby reducing the interference of non-sample gamma ray noise; the neutron generator power supply control cabinet 3 is connected with the neutron generator 6 for providing neutron The generator 6 supplies power, and at the same time regulates the neutron output of the neutron generator 6; the surrounding reflective layer 18 is made of graphite, with a wall thickness of 160mm, which is used to reflect neutrons and increase the effective neutron flux; the upper reflector The layer 11 is located at the barrel cover 4 and has a thickness of 180 mm. It also plays a role of neutron reflection and improves the effective neutron flux at the sample; the inner diameter of the measuring chamber 22 is 900 mm and the height is 650 mm. The sample holder 20 is located in the measuring chamber 22 for Support the sample 19 so that the sample 19 is not in contact with the neutron generator 6; the gamma ray detector 9 is a sodium iodide (NaI) detector with a crystal diameter of 101.6 mm and a height of 101.6 mm, which is used to collect characteristic gamma rays excited by neutrons Ma ray; the multi-channel analyzer 7 is connected with the gamma-ray detector 9 for the conversion storage and transmission of the characteristic gamma-ray; the industrial control computer 1 is connected with the multi-channel analyzer 7 for processing the transmission of the multi-channel analyzer 7 The data.

The gamma ray shielding layer 17 is made of lead, located between the surrounding reflective layer 18 and the inner steel layer 16, with a wall thickness of 40mm, and is used to shield the characteristic gamma ray produced by the reaction of neutrons and the energy-absorbing buffer layer 15, and reduce the surrounding structure. The gamma rays produced by the material interfere with the effective signal, improving the measurement accuracy; the detector protective layer 10 is made of lead material, which reduces the characteristic gamma ray noise generated by the surrounding structural materials twice, and at the same time reduces the measurement dead time and improves the measurement efficiency The environmental protection layer 13 is made of boron-containing polyethylene material, and the content of boron carbide is 5%. The neutrons are scattered and moderated by the hydrogen element, and the neutrons are absorbed by the boron element, so that the neutrons and the gamma produced are less harmful to the human body. and environmental damage.

The mechanical shaft 8 is connected to the barrel lid 4 and the barrel body 5 to support the opening of the barrel lid 4; the motor 2 is connected to the mechanical shaft 8 to provide power for the mechanical shaft 8; the industrial control computer 1 is connected to the motor 2 to operate the motor 2 , to control the opening and closing of the lid 4.

The working design principle of the device is:

The explosion-proof system uses high-density polyethylene fiber as the energy-absorbing buffer material, which has a high hydrogen content and a large macroscopic neutron cross-section, which can be used as a neutron moderator and absorber. The D-D neutron generator 6 is half-wrapped in the bottom energy-absorbing buffer material, and the energy-absorbing buffer material is used as the neutron moderator layer, which can effectively moderate the 2.5MeV neutrons, so that the effective neutron flux at 19 samples Increase, while reducing the increase in structural material, thereby reducing the interference of non-sample gamma ray noise. The surrounding energy-absorbing buffer material can absorb scattered neutrons, effectively reducing neutron damage to the environment and personnel.

The neutron emission direction is 4π direction, and it is impossible to be all slowed down, so there are still a large number of fast neutrons, the neutron reflective layer is set to reflect the fast neutrons, reduce the neutron energy, focus on the sample 19, and increase the effective Neutron flux, which can improve the measurement efficiency of the device. Adding a neutron reflective layer will also react with neutrons, and emit gamma rays as interference noise, which will affect the effective signal. Therefore, it is necessary to comprehensively consider the effective neutron flux gain and gamma ray interference brought by the neutron reflective layer. The signal-to-noise ratio is used as an evaluation criterion for device design, and the best neutron reflector material is selected. Under the condition that the measurement chamber 22 is sufficiently large, graphite is selected as the material of the neutron reflection layer and its size is determined.

A gamma ray shielding layer 17 is set between the inner steel layer 16 and the surrounding reflective layer 18, the purpose is to reduce the interference of the gamma ray generated by the surrounding energy-absorbing buffer material and neutron reaction, improve the signal-to-noise ratio of the overall device, thereby improving the overall The device measures efficiency. In the case that the effects of lead and bismuth are similar, lead is selected as the material of the gamma-ray shielding layer 17 considering the economic cost, and the size of the gamma-ray shielding layer 17 is determined according to the change of the overall signal-to-noise ratio of the device.

A detector protective layer 10 is arranged between the upper reflective layer 11 and the gamma-ray detector 9, so as to prevent the gamma-ray noise generated in the upper reflective layer 11 from directly entering the gamma-ray detector 9 and causing interference to the effective signal. The interference noise entering the gamma ray detector 9 is reduced again, and the signal-to-noise ratio of the device is improved. If lead is used as the material of the detector protective layer 10, as the thickness of the detector protective layer 10 gradually increases, the noise contribution of surrounding structural materials decreases, and the signal-to-noise ratio of the overall device gradually increases. As a part of the structural material, the detector protective layer 10 will also generate gamma rays to contribute to noise. When the thickness reaches a certain level, the noise contribution of the detector protective layer 10 is greater than the gain of its shielding other structural noises to the signal-to-noise ratio. As a result, the signal-to-noise ratio shows a downward trend. Guided by the signal-to-noise ratio evaluation standard, 90mm lead is selected as the detector protective layer 10 .

An environmental protection layer 13 is provided between the decorative shell 12 and the outer steel layer 14 to reduce the impact of neutrons on the environment and the human body by absorbing and scattering neutrons. Considering the neutron absorption cross-section and economic cost, polyethylene with a boron carbide content of 5% was selected as the material of the environmental protection layer 13. By changing the thickness of the environmental protection layer 13, the dose at a distance of 20 cm from the device was lower than 25 μSv/h.

When the device is actually implemented, the NaI detector can be purchased from a detector crystal manufacturer, such as a detector produced by SaintGobain. The D-D neutron generator 6 and the neutron generator power supply control cabinet 3 can also be purchased directly from the company. A multi-channel analyzer 7 is commercially available, such as the LanBase multi-channel analyzer from the company Saint Gobain. The motor 2 and the mechanical shaft 8 can be purchased directly from the company.

The high-precision explosion-proof detection integrated device detects the tested item, controls the motor 2 through the industrial control computer 1, adjusts the angle of the mechanical shaft 8, opens the barrel cover 4, and puts the tested item on the sample rack 20, and also through the industrial control computer 1 controls the bung 4 to close.

Connect the Lanbase multi-channel analyzer 7 and the industrial control computer 1 through a network cable, open the gamma energy spectrum analysis software on the interface of the industrial control computer 1, and adjust the high voltage of the NaI detector. Use R232 to connect the neutron generator power supply control box 3 and the industrial control computer 1, open the D-D neutron generator control software on the interface of the industrial control computer 1, and adjust the ion source voltage, ion source current and accelerator voltage parameters to the set values in sequence , so that the D-D neutron generator 6 emits a neutron beam with a stable yield. The neutrons pass through the energy-absorbing buffer material and are moderated into thermal neutrons, and the neutrons emitted in other directions are scattered by the reflective layer, and are further moderated, increasing the thermal neutron flux at the measured object. Thermal neutrons undergo a radiation capture reaction with the elements in the object to be tested, and emit instantaneous characteristic gamma rays. The characteristic gamma rays have element characteristics and correspond to elements one by one. Prompt characteristic gamma rays enter the detector and deposit, the generated signal is recorded by the detector, the signal is collected by the multi-channel analyzer 7, and then sent to the industrial control computer 1 to be recorded as a gamma ray energy spectrum by the gamma energy spectrum analysis software , the position of the characteristic peak in the energy spectrum indicates the type of element, and the intensity of the characteristic peak indicates the content of the element in the sample.

Obtain the gamma ray energy spectrum of the sample within the set measurement time, analyze the gamma ray energy spectrum, obtain the elemental composition in the tested item, and determine whether there is an explosive in the tested item. If there are explosives, evacuate the crowd and notify the relevant departments for emergency treatment. Even if an explosion occurs in the device, the explosion-proof system can reduce the impact of the explosion and prevent the fragments from splashing to ensure public safety; if there are no explosives and other dangerous goods , after the measurement time is over, adjust the acceleration pole, voltage, ion source current and ion source voltage parameters to zero in turn, turn off the D-D neutron generator 6, and no neutrons will be generated. Wait for a period of time, operate the motor 2 to control the mechanical shaft 8, open the bucket cover 4, take out the object to be tested, and complete the detection.

It should be noted that terms such as "upper", "lower", "left", "right", "front", and "rear" quoted in the invention are only for clarity of description, not for Limiting the practicable scope of the present invention, and the change or adjustment of the relative relationship shall also be regarded as the practicable scope of the present invention without substantive changes in the technical content.

The above are only preferred implementations of the present invention, and the protection scope of the present invention is not limited to the above-mentioned embodiments, and all technical solutions under the idea of the present invention belong to the protection scope of the present invention. It should be pointed out that for those skilled in the art, some improvements and modifications without departing from the principle of the present invention should be regarded as the protection scope of the present invention.

Claims (10)

1. a kind of explosion-proof detection integrated apparatus of high-precision, which is characterized in that including：Explosion protection system, neutron source item system, sample Detecting system, energy spectrum analysis system, shielding protection system and mechanical dynamic system；The neutron source item system is in explosion protection system Neutron is discharged, the specimen inspection system receives the characteristic gamma ray that neutron inspires, the energy spectrum analysis system Gamma ray spectroscopy is recorded, the shielding protection system shields gamma ray, the mechanical dynamic system control The opening and closing of device processed.

2. a kind of explosion-proof detection integrated apparatus of high-precision as described in claim 1, it is characterised in that：The explosion protection system packet Include decorative shell（12）, outer steel layer（14）, energy-absorbing buffering layer（15）, interior steel layer（16）And reinforcing rib（21）；The decorative shell （12）Form bucket main body（5）Outer layer, decorative shell（12）, outer steel layer（14）, energy-absorbing buffering layer（15）, interior steel layer（16）By outer To interior close proximity successively, the reinforcing rib（21）Mounted on outer steel layer（14）Bottom.

3. a kind of explosion-proof detection integrated apparatus of high-precision as claimed in claim 2, it is characterised in that：The neutron source term system System includes accelerator for neutron production（6）, accelerator for neutron production power supply control cabinet（3）, peripheral reflection layer（18）And top reflector（11）； The accelerator for neutron production（6）Partly it is wrapped in energy-absorbing buffering layer（15）In, the accelerator for neutron production power supply control cabinet（3）With neutron Generator（6）Connection is accelerator for neutron production（6）Power supply, the peripheral reflection layer（18）And top reflector（11）Play neutron Reflex, peripheral reflection layer（18）Positioned at interior steel layer（16）Inside, top reflector（11）Positioned at bung（4）Place.

4. a kind of explosion-proof detection integrated apparatus of high-precision as claimed in claim 3, it is characterised in that：The sample detection system System includes measuring chamber（22）, specimen holder（20）, sample（19）And gamma-ray detector（9）；The measurement chamber（22）Position In peripheral reflection layer（18）It is interior, the specimen holder（20）Positioned at measurement chamber（22）In, it is used to support sample（19）, the gamma Ray detector（9）Positioned at top reflector（11）In, accelerator for neutron production（6）The neutron and sample of release（19）Radiation prisoner occurs Reaction, release characteristic gamma ray are obtained, characteristic gamma ray enters gamma-ray detector（9）And it deposits, the signal quilt of generation Gamma-ray detector（9）Record.

5. a kind of explosion-proof detection integrated apparatus of high-precision as claimed in claim 4, it is characterised in that：The energy spectrum analysis system System includes multichannel analyzer（7）And industrial control computer（1）；The multichannel analyzer（7）With gamma-ray detector（9）Phase Even, for the conversion of characteristic gamma ray storage and transmission, the industrial control computer（1）With multichannel analyzer（7）It is connected, For handling multichannel analyzer（7）The data of transmission.

6. a kind of explosion-proof detection integrated apparatus of high-precision as claimed in claim 5, it is characterised in that：The shielding protection system System includes gamma ray shielded layer（17）, detector protective layer（10）And environmental protection ply（13）；The gamma ray shielded layer （17）Positioned at peripheral reflection layer（18）With interior steel layer（16）Between, the detector protective layer（10）Positioned at top reflector（11） And gamma-ray detector（9）Between, the environmental protection ply（13）Positioned at decorative shell（12）With outer steel layer（14）Between.

7. a kind of explosion-proof detection integrated apparatus of high-precision as claimed in claim 6, it is characterised in that：The machine power system System includes mechanical rotating shaft（8）And motor（2）；The mechanical rotating shaft（8）It is connected to bung（4）With bucket main body（5）Between, the electricity Machine（2）Respectively with mechanical rotating shaft（8）, industrial control computer（1）It is connected, motor（2）For mechanical rotating shaft（8）Power, work are provided Industry control computer（1）For operating motor（2）, control bung（4）Unlatching and closure.

8. a kind of explosion-proof detection integrated apparatus of high-precision as claimed in claim 7, it is characterised in that：The bucket main body（5） Internal diameter be 900mm, outer diameter 1030-1060mm, be highly 850-880mm；Decorative shell（12）For stainless steel material；Interior steel Layer（16）For carbon steel material, outer diameter 916mm, high 658mm, wall thickness 8mm, underlayer thickness 8mm；Energy-absorbing buffering layer（15）For high density Polyethylene fibre material, outer diameter 1014mm, underlayer thickness 176mm, wall thickness 49mm；Outer steel layer（14）For carbon steel material, outer diameter 1030mm, underlayer thickness 8mm, wall thickness 8mm；Reinforcing rib（21）For carbon steel material, long 500mm, wide 8mm, high 8mm.

9. a kind of explosion-proof detection integrated apparatus of high-precision as claimed in claim 7, it is characterised in that：The accelerator for neutron production （6）For D-D accelerators for neutron production, the neutron that energy is 2.5MeV is generated；Peripheral reflection layer（18）For graphite material, wall thickness 160mm； Top reflector（11）Thickness is 180mm；Measure chamber（22）Internal diameter 900mm, high 650mm；Gamma-ray detector（9）For iodine Change sodium detector, crystal diameter 101.6mm, high 101.6mm.

10. a kind of explosion-proof detection integrated apparatus of high-precision as claimed in claim 7, it is characterised in that：The gamma ray Shielded layer（17）For lead material, wall thickness 40mm；Detector protective layer（10）For lead material；Environmental protection ply（13）For the poly- second of boracic Alkene material, carbonization boron content are 5%.