基于液体闪烁体探测器的被动法快中子多重性测量装置的研制

刘月壮; 张少东; 尤园江; 林旭润; 周志波; 李多宏; 周星宇; 李梦远; 金宝亮; 李猛; 马麟; 张琦; 李达; 武朝辉; 张小东

doi:10.11889/j.0253-3219.2025.hjs.48.240364

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基于液体闪烁体探测器的被动法快中子多重性测量装置的研制

更新时间：2025-03-31

- 基于液体闪烁体探测器的被动法快中子多重性测量装置的研制
- R&D of passive fast neutron multiplicity counting system based on liquid scintillation detectors
- 核技术 2025年文章编号：XXXXXX
- 作者机构：
  
  1.核科学与工程学院华北电力大学北京 102206
  2.国家核安保技术中心北京 102401
  3.中广核研究院有限公司深圳 518031
  4.深圳市核与辐射安全重点实验室，中国核能与安全高等研究院，深圳大学物理与光电工程学院深圳 518060
- 作者简介：
  
  刘月壮，男，1994年出生，2021年于华北电力大学获硕士学位，研究领域为核材料衡算
  张小东，E-mail：zhangxiaodong@szu.edu.cn
- 基金信息：
  
  国家核安保技术中心,深圳市高等学校新引进高精尖缺人才科研启动经费(868-000001020169)
- DOI：10.11889/j.0253-3219.2025.hjs.48.240364
  中图分类号： TL81
- 收稿日期：2024-09-14，
  
  修回日期：2025-01-12，
  
  网络出版日期：2025-03-31，
- 稿件说明：
移动端阅览
刘月壮, 张少东, 尤园江, 等. 基于液体闪烁体探测器的被动法快中子多重性测量装置的研制[J/OL]. 核技术, 2025,XXXXXX

LIU Yuezhuang, ZHANG Shaodong, YOU Yuanjiang, et al. R&D of passive fast neutron multiplicity counting system based on liquid scintillation detectors[J/OL]. Nuclear techniques, 2025, XXXXXX
刘月壮, 张少东, 尤园江, 等. 基于液体闪烁体探测器的被动法快中子多重性测量装置的研制[J/OL]. 核技术, 2025,XXXXXX DOI： 10.11889/j.0253-3219.2025.hjs.48.240364. CSTR： 32193.14.hjs.CN31-1342/TL.2025.48.240364.

LIU Yuezhuang, ZHANG Shaodong, YOU Yuanjiang, et al. R&D of passive fast neutron multiplicity counting system based on liquid scintillation detectors[J/OL]. Nuclear techniques, 2025, XXXXXX DOI： 10.11889/j.0253-3219.2025.hjs.48.240364. CSTR： 32193.14.hjs.CN31-1342/TL.2025.48.240364.

摘要

快中子多重性测量技术能够快速、准确地检测出特殊核材料（Special Nuclear Materials，SNM）中

240

Pu的有效质量，对防止核扩散具有重要意义。本文详细介绍了团队开发的一套被动快中子多重性测量装置，该装置主要由32个自主研发的EJ-309液体闪烁探测器组成。为提高探测效率的均匀性，这些探测器以球对称形式排布。此外，该装置集成了自主设计开

发的32通道的高压电源以及用户友好图形界面。数据分析采用双重（Doubles）参数拟合和快中子多重性分析两种方法。对该装置的测试结果表明：该装置能够准确计算出

252

Cf中子源（等效

240

Pu有效质量为5.37~209.62 g）的自发裂变率。此外，该装置还在不同的环境本底（总中子计数率Singles分别为111.42±0.46、73.97±0.28、47.27±0.29）下进行测试。测量结果与低本底下（Singles计数率为0.51±0.02）的测量结果基本一致，这表明该装置具有非常好的抗本底干扰能力。

Abstract

Background

Traditional thermal/epithermal neutron multiplicity counting systems based on

He tubes have relatively low measurement accuracy and high development costs. Fast neutron multiplicity counting (FNMC) technique based on liquid scintillation detectors has become a research hotspot. However

fast neutron multiplicity counting systems currently built are still in the experimental research stage.

Purpose

This study aims to develop a passive fast neutron multiplicity counting system that can be used for practical measurement.

Method

Firstly

a passive fast neutron multiplicity counting system was built using 32 self-developed EJ-309 liquid scintillation detectors. To improve the uniformity of neutron detection efficiency of the system

these detectors were arranged in a spherically symmetrical geometry. The system also integrated a self-designed and developed 32-channel high-voltage power supply and a user-friendly graphical interface. Secondly

the Doubles parameter fitting method and the three-parameter fast neutron multiplicity analytical method were used to evaluate the spontaneous fission rates of the

252

Cf neutron sources respectively. Finally

the performance of the system under different neutron radiation backgrounds (with Singles rates of 111.42±0.46

73.97±0.28

and 47.27±0.29

respectively) was also evaluated.

Results

The experimental results show that the Doubles parameter fitting method can accurately evaluate the spontaneous fission rates of

252

Cf neutron sources. The relative differences of the spontaneous f

ission rates of the

252

Cf neutron sources evaluated by using the fast neutron multiplicity analytical method are less than ±4%. The measurement results under different neutron radiation backgrounds are basically consistent with those under natural environment background (the Singles rates were 0.51±0.02).

Conclusions

The FNMC system can accurately determine the spontaneous fission rate of the

252

Cf neutron source (with an equivalent

240

eff

mass range of 5.37~209.62 g)

and has very good anti-background interference capabilities.

关键词

Keywords

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