溴化镧中子探测机理  

Mechanism of neutron measurement based on lanthanum bromide detector

作　　者：刘翠红 杨永新[1] 曾志[2,3] 李君利[2,3] 吕汶辉 LIU Cuihong;YANG Yongxin;ZENG Zhi;LI Junli;LYU Wenhui(Unit 92609 of PLA,Beijing 100077,China;Department of Engineering Physics,Tsinghua University,Beijing 100084,China;Key Laboratory of Particle and Radiation Imaging(Ministry of Education),Tsinghua University,Beijing 100084,China)

机构地区：[1]中国人民解放军92609部队,北京100077 [2]清华大学工程物理系,北京100084 [3]清华大学粒子技术与辐射成像教育部重点实验室,北京100084

出　　处：《哈尔滨工程大学学报》2022年第11期1566-1571,1620,共7页Journal of Harbin Engineering University

摘　　要：为解决溴化镧无法用于实验室外中子探测问题,本文采用理论分析、蒙特卡罗模拟与实验室测量相结合的方法,从微观物理过程入手,分析了中子与溴化镧相互作用类型、反应截面及反应产物。结果表明:可利用中子与溴化镧晶体发生非弹性散射产生的退激γ射线,实现溴化镧探测器直接测量中子。研究成果为溴化镧中子探测奠定了物理基础,也为其用于中子/γ混合辐射场测量提供了前提条件。Theoretical analysis,Monte Carlo simulation,and laboratory measurement are combined in this paper to solve the inapplicability problem of the lanthanum bromide detector for neutron detection outside of the laboratory.Starting from the microscopic physical process,the interaction types,reaction cross-sections,and reaction products of the interaction between neutrons and lanthanum bromide are analyzed.Results show that the neutrons can be directly measured by the lanthanum bromide detector using the de-excitedγ-rays generated by the inelastic scattering of neutrons and lanthanum bromide crystals.The research results lay a physical foundation for lanthanum bromide neutron detection and also provide a prerequisite for its application in neutron/γmixed radiation field measurement.

关 键 词：溴化镧 中子响应 非弹性散射 蒙特卡罗模拟 中子特征γ峰 中子探测 镅铍中子源 响应能谱 

分 类 号：TL81[核科学技术—核技术及应用]