首页|基于中子/瞬发γ射线联合测量的中子剂量监测模拟研究

基于中子/瞬发γ射线联合测量的中子剂量监测模拟研究

扫码查看
原文链接
  • 国家科技期刊平台
  • NETL
  • NSTL
  • 万方数据
辐射场下的中子周围剂量当量率监测具有重要意义，其可以反应核设施运行状况以及辐射防护信息。目前常用的监测仪器为基于单探测器、单慢化体的A-B型剂量当量率仪，其响应曲线与"中子注量-周围剂量当量转换系数"有较大的差异，导致测量结果误差较大。为提升中子剂量仪测量结果的准确性，对基于中子和瞬发γ射线联合监测中子剂量率开展研究。利用铅块、含硼聚乙烯、有机玻璃和氯化钠组合而成的转换材料，通过蒙特卡罗模拟计算B、H、Cl、Pb、C和O元素对不同能量中子的响应，利用响应曲线结合LB6411型剂量仪的响应曲线进行线性拟合，得到与"中子注量-周围剂量当量转换系数"更为接近的响应曲线。通过差分进化算法计算得到线性拟合系数，结果显示，新的响应曲线在1×10-8～16 MeV能量区间内与hø响应曲线更贴近，二者的相对偏差在50％之内。联合测量中子与瞬发γ射线对中子周围剂量当量率进行监测可行，为中子剂量仪校准和研发提供了新的方向和支持。
Simulation Study on Neutron Dose Monitoring Based on Joint Measurement of Neutron and Prompt Gamma-Rays
The monitoring of neutron ambient dose equivalent rate in a radiation field is of significant importance as it can reflect the operational status of nuclear facilities and provide radiation protection information.Currently,the commonly used monitoring instrument is the A-B type dose equivalent rate meter based on a single detector and a single moderator.However,its response curve differs from the"neutron fluence-ambient dose equivalent conversion coefficient,"leading to measurement errors.In this study,in order to improve the accuracy of neutron dosimeter measurement,a feasibility study was carried out on the joint monitoring of neutron dose rate based on neutrons and instant γ-rays.Lead,borated polyethylene,polymethyl methacrylate,and sodium chloride were used to establish a conversion object.Monte Carlo simulations were performed to calculate the neutron responses of elements B,H,Cl,Pb,C and O.Then,these response curves were combined with the response curves of the LB6411 dosimeter to obtain a new response curve closer to the"neutron fluence-ambient dose equivalent conversion coefficient".The linear fitting coefficients were calculated by using the differential evolution algorithm.The results demonstrate that the modified response curve is closely to the hø response curve.The relative discrepancies are within 50％for the energy range of 1×10-8-16 MeV.The study indicates the feasibility of joint measurement of neutron and prompt gamma-ray for monitoring neutron ambient dose equivalent rate,providing new directions and support for neutron dosimeter calibration and development.

neutron ambient dose equivalentprompt gamma raysresponse curvedifferential evolution algorithm

程璨、贾文宝、顾加雨、邢立腾、胡尊浩、马靖武、夏勋荣

展开 >

江苏省计量科学研究院(江苏省能源计量数据中心),南京 210023

南京航空航天大学,南京 211106

南京中医药大学附属医院(江苏省中医院),南京 210019

中子周围剂量当量 瞬发γ射线 响应曲线 差分进化算法

国家自然科学基金中国博士后科学基金江苏省卓越博士后计划江苏省市场监督管理局科技计划项目江苏省市场监督管理局科技计划项目江苏省市场监督管理局科技计划项目

121051432023M741453JB23057KJ2024009KJ2024044KJ2023015

2024

10.7538/tws.2024.youxian.0372

同位素
中国核学会同位素分会

同位素

CSTPCD
影响因子：0.405
ISSN：1000-7512
年,卷(期)：2024.37(4)