基于碳化硼慢化体和涂硼微结构中子探测器的通用中子能谱仪设计和解谱方法研究  

A general neutron spectrometer design method based on boron moderator and boron-coated micro-structure neutron detectors

作　　者：颜筱宇 韩纪锋 黄宇[1] 宋瑞强 徐子虚 刘星泉 曲国峰 张艺蓉 冷强钟 任飞旭 张鑫[1] 陈蕾[1] 刘吉珍 YAN Xiao-Yu;HAN Ji-Feng;HUANG Yu;SONG Rui-Qiang;XU Zi-Xu;LIU Xing-Quan;QU Guo-Feng;ZHANG Yi-Rong;LENG Qiang-Zhong;REN Fei-Xu;ZHANG Xin;CHEN Lei;LIU Ji-Zhen(Key Laboratory of Radiation Physics and Technology of the Ministry of Education,Institute of Nuclear Science and Technology,Sichuan University,Chengdu 610064,China;Graduate School of Engineering,Osaka University,Osaka 565-0871,Japan;Helmholtz Institute,Johannes Gutenberg-Universit t Mainz,Mainz 55099,Germany;Nuclear Power Institute of China,Chengdu 610041,China)

机构地区：[1]四川大学原子核科学技术研究所辐射物理及技术教育部重点实验室,成都610065 [2]大阪大学工程研究院,大阪565-0871 [3]约翰内斯-古腾堡大学美因茨分校亥姆霍兹研究所,美茵茨55099 [4]中国核动力研究设计院,成都610041

出　　处：《四川大学学报（自然科学版）》2023年第2期122-132,共11页Journal of Sichuan University(Natural Science Edition)

基　　金：四川省科技计划(2022NSFSC0831,2020YJ0313);中央高校基本科研业务费。

摘　　要：本文提出了一种基于碳化硼慢化体和涂硼微结构中子探测器的通用中子能谱仪设计方法,获得了计算最优慢化体厚度和探测器响应函数的通用公式,并用蒙特卡罗方法进行了验证和修正,可实现对中子能谱仪的快速设计.该类能谱仪可实现各中子响应函数之间的解耦,使每个探测器对各个分立能量区间的中子最为敏感,具有较强适用性和灵活性.基于该方法,我们设计了一个用于硼中子俘获治疗(BNCT)超热中子能谱测量的能谱仪,通过Gravel算法实现了中子能谱解析,并提出了一种具有良好普适性的基于响应函数的预置谱设置方法.结果表明,该能谱仪对单能中子的峰位解析精度约为1%,对BNCT连续谱的解析均方差约为0.76%,具有较大技术优势和可行性.In this paper,a general neutron spectrometer design method based on boron carbide moderators and boron-coated micro-structure neutron detectors is proposed.The formula for calculating the optimal moderator thickness and detector response function according to the neutron energy is obtained,which is verified and modified by the Monte Carlo simulation.The formula is able to realize the rapid design of the neutron spectrometer effectively.This kind of energy spectrometer can realize the decoupling of neutron response functions,so that each detector is most sensitive to neutrons in each discrete energy range,and has strong applicability and flexibility.An epithermal neutron spectrometer for boron neutron capture therapy(BNCT)is designed based on the proposed method,the response function of the spectrometer is calculated and the neutron spectrum unfolding is achieved by the Gravel algorithm.The results show that the resolution accuracy of the energy spectrometer to the peak position of monoenergetic neutrons is about 1%,and the analytical mean square error of the BNCT continuous spectrum is about 0.76%,which has great technical advantage and feasibility.

关 键 词：中子谱仪 蒙特卡罗方法 少道解谱算法 硼中子俘获治疗 

分 类 号：TL816+.3[核科学技术—核技术及应用]