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R&D of passive fast neutron multiplicity counting system based on liquid scintillation detectors
- NUCLEAR TECHNIQUES Article number: XXXXXX(2025)
- 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：
LIU Yuezhuang, male, born in 1994, graduated from North China Electric Power University with a master's degree in 2021, focusing on nuclear material accounting
ZHANG Xiaodong, E-mail: zhangxiaodong@szu.edu.cn
- 基金信息：the State Nuclear Security Technology Center, Fund of Newly Introduced High-end and Shortage Talents of Shenzhen Higher Education Institutions(868-000001020169)
DOI：10.11889/j.0253-3219.2025.hjs.48.240364
CLC： TL81Received：14 September 2024，
Revised：12 January 2025，
Published Online：31 March 2025，
- 稿件说明：
移动端阅览
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
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
2
Traditional thermal/epithermal neutron multiplicity counting systems based on
3
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
2
This study aims to develop a passive fast neutron multiplicity counting system that can be used for practical measurement.
Method
2
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
2
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
2
The FNMC system can accurately determine the spontaneous fission rate of the
252
Cf neutron source (with an equivalent
240
Pu
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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