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Method for quickly recognizing heavy nuclear material by using cosmic ray muons

A cosmic ray and cosmic ray technology, which is applied in material analysis using radiation, material analysis using wave/particle radiation, and material analysis, can solve the problems of long time and low accuracy in judging special nuclear materials, and achieve ingenious design. , easy to implement, cost-reducing effect

Pending Publication Date: 2018-08-21
MATERIAL INST OF CHINA ACADEMY OF ENG PHYSICS
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Problems solved by technology

[0003] The technical problem to be solved by the present invention is to provide a method for quickly identifying heavy nuclear materials using cosmic ray muons, and solve the problem of whether there are special nuclear materials hidden in containers or other containers in the application scenarios of nuclear proliferation prevention such as port and airport security inspections in the prior art. The problem of long material judgment time and low accuracy

Method used

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  • Method for quickly recognizing heavy nuclear material by using cosmic ray muons
  • Method for quickly recognizing heavy nuclear material by using cosmic ray muons
  • Method for quickly recognizing heavy nuclear material by using cosmic ray muons

Examples

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example 1

[0050] Such as figure 1 Or as shown in 4, the upper and lower layers are three-layer MRPC flat-panel detectors, placed horizontally, used to record the impact position of the muon before and after passing through the measured object, so as to calculate the incident direction and outgoing direction of the muon, and the middle is the detection Area to place the object to be inspected. The object to be inspected in this example is a 70×70×70cm 3 airtight container, and in the 70 x 70 x 70cm 3 A 10×10×10cm 3 The object to be measured is uranium, iron or air. Obtain the accuracy rate of distinguishing uranium and iron and uranium and air under different time according to the method of the present invention, the result is as follows figure 2 It is shown that 100% accuracy can be distinguished between uranium and air in 1 minute, and more than 95% accuracy can be realized between uranium and iron in 4 minutes. Figure 4 The size of each layer of detectors is 1.2×2.4m2, the dista...

example 2

[0052] Such as figure 1 Or as shown in 4, the upper and lower layers are three-layer MRPC flat-panel detectors, placed horizontally, used to record the impact position of the muon before and after passing through the measured object, so as to calculate the incident direction and outgoing direction of the muon, and the middle is the detection Area, place the object to be inspected, in this example, it is 70×70×70cm 3 A 20×20×20cm 3 The target to be tested, the target to be tested is lead or iron, and the wall thickness of the target to be tested is 5cm, and a 10×10×10cm 3 of uranium blocks. According to the method of the present invention, the accuracy rate of judging whether there is a uranium block hidden in the object to be tested is obtained at different times, and the results are as follows: image 3 As shown, 95% accuracy can be realized in 3 minutes to determine whether there is uranium block in the iron shielding body, and 95% accuracy can be realized in 5 minutes to...

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Abstract

The invention discloses a method for quickly recognizing a heavy nuclear material by using cosmic ray muons and solves the problems of long judgment time and low accuracy in judging whether special nuclear materials are hidden in containers or other containers in ports, airport security check and other nuclear proliferation prevention application scenes in the prior art. The method comprises the steps as follows: firstly, constructing a cosmic ray muon detection system model, and calculating the scattering angle root mean square value theta i sequence of 10<6> muons penetrating through commonhigh, middle and low atomic number material targets; then, calculating the scattering angle root mean square value theta x, measured by the detection system in a short time, of the muons penetrating through targets; calculating the grey correlation degree of theta x and each value in the theta i sequence, and determining one target as the heavy nucleus material when the grey correlation degree isthe highest. The method is ingenious in design, easy to implement and capable of quickly and accurately judging whether special nuclear materials are hidden in closed containers and is very suitable for detecting whether heavy nuclear materials are hidden in cargos in containers or other containers in custom wharfs and airports.

Description

technical field [0001] The invention relates to the application field of nuclear technology, in particular to a method for rapidly identifying heavy nuclear materials by using cosmic ray muons. Background technique [0002] With the development of nuclear technology, the renaissance of nuclear power, and the emergence of more "de facto nuclear countries", the possibility of terrorist forces seeking nuclear materials and weapons continues to increase. The international nuclear security situation is very severe. In this regard, on the one hand, the relevant countries Both nuclear-related units and customs are strengthening the supervision of nuclear material production, storage and transportation; on the other hand, various countries are working hard to develop and develop high-performance detection systems to effectively combat the smuggling and illegal transportation of nuclear materials. Nuclear materials usually refer to substances with high atomic number elements such as ...

Claims

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Application Information

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IPC IPC(8): G01N23/04
CPCG01N23/04G01N2223/03G01N2223/639
Inventor 何伟波肖洒李英儒
Owner MATERIAL INST OF CHINA ACADEMY OF ENG PHYSICS
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