L-M algorithm based explosive detection method by using the fast neutron

Jiangfeng LI; Ming SU; Zhonghua XIONG; Fan GAO

doi:10.11889/j.0253-3219.2018.hjs.41.080405

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L-M algorithm based explosive detection method by using the fast neutron

NUCLEAR ELECTRONICS AND INSTRUMENTATION | 更新时间：2021-05-19

- L-M algorithm based explosive detection method by using the fast neutron
- NUCLEAR TECHNIQUES Vol. 41, Issue 8, Article number: 080405(2018)
- 作者机构：
  
  1.中国工程物理研究院表面物理与化学重点实验室江油 621907
  2.中国工程物理研究院材料研究所绵阳 621700
- 作者简介：
- 基金信息：
- DOI：10.11889/j.0253-3219.2018.hjs.41.080405
  CLC： TL99
- Received：24 November 2017，
  
  Revised：11 May 2018，
  
  Published：2018-08
- 稿件说明：
移动端阅览
Jiangfeng LI, Ming SU, Zhonghua XIONG, et al. L-M algorithm based explosive detection method by using the fast neutron[J]. Nuclear techniques, 2018, 41(8): 080405
DOI：

Jiangfeng LI, Ming SU, Zhonghua XIONG, et al. L-M algorithm based explosive detection method by using the fast neutron[J]. Nuclear techniques, 2018, 41(8): 080405 DOI： 10.11889/j.0253-3219.2018.hjs.41.080405.

摘要

比起传统的X射线探测方法，快中子对爆炸物的检测更加准确，因而备受各国研究者的重视。利用中子源的快中子共振连续谱，准确计算待测物体的核素比例以达到检测爆炸物的目的。采用蒙特卡罗程序（Monte Carlo N-Particle code，MCNP）结合中子飞行时间（Time of Flight，TOF）方法模拟了4种爆炸物的中子共振谱，通过伴随γ粒子法测量

252

Cf源TOF谱，并运用L-M（Levenberg-Marquardt）算法对各核素的相对比例进行拟合计算。考虑时间分辨、中子飞行距离、待测物体厚度以及统计涨落对计算结果的影响，提出了更准确的TOF谱测量方法。研究结果表明，在能量分辨率较好的条件下，L-M拟合算法能较为准确地计算爆炸物的核素比例，最大误差不超过10%；能量分辨变差，物体厚度增大都会造成计算误差增大；统计涨落的影响使得该方法对于中子计数有一定的要求，总计数达到10

条件下的误差在可接受范围内。通过拟合快中子共振连续谱的方式能够获得物质的精确的核素比例以实现爆炸物的检测，但是要想将这种方法应用到现场测量中还需要进一步的研究。

Abstract

Background

Compared with the traditional X ray detection method

use of fast neutron to detect explosives can get more accurate result which has attracted worldwide attention.

Purpose

This study aims to detect explosive by using the continuous fast neutron resonance spectrum of radioactive neutron source.

Methods

The Monte Carlo program Monte Carlo N-particle code (MCNP) was used to simulate the neutron spectrum of four kinds of explosives combining neutron time of flight method. The associated γ particle method can be used to measure the neutron time of flight (TOF) spectrum of

252

Cf in practice

and levenberg-marquardt (L-M) fitting method was applicable to accurately calculate relative proportions of each nuclide. Based on the TOF methods of neutron energy spectrum measuring

the influence on the calculation results of time resolution

neutron flight distance

the thickness of the explosives and the statistical fluctuation has been taken into account for the measurement accuracy.

Results

The results show that L-M method can accurately calculate explosive nuclide ratio with high energy resolution

the maximum error was less than 10%. The energy resolution and thickness of the explosives increase the calculation error whilst the influence of statistical fluctuation can be eliminated by more than 10

neutron counting

Conclusions

The exact nuclide ratio of the material can be obtained by fitting the fast neutron resonance continuous spectrum to realize the detection of the explosives. However

further research is needed to apply this method to the on-site measurement.

关键词

Keywords

references

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