室内环境中子能谱及剂量率的多球谱仪测量  

Measurement of indoor natural neutron spectrum with a Bonner sphere spectrometer

作　　者：胡庆东[1] 曾志[1] 马豪[1] 程建平[1] 李君利[1] 张辉[1] 王鑫[1] 武祯[1,2] 

机构地区：[1]清华大学工程物理系粒子技术与辐射成像教育部重点实验室,北京100084 [2]同方威视股份有限公司,北京100084

出　　处：《清华大学学报（自然科学版）》2015年第12期1332-1334,1341,共4页Journal of Tsinghua University(Science and Technology)

基　　金：国家自然科学基金资助项目(11175099)

摘　　要：利用自主研发的多球中子谱仪对北京市某室内环境中子能谱及剂量率进行了测量。从中子能谱获得了能量低于20MeV的环境中子注量率为2.83×10^(-3)cm^(-2)·s^(-1),估算出环境中子总注量率为3.54×10^(-3)cm-2·s^(-1);利用中子注量与周围剂量当量转换系数计算出了能量低于20MeV中子周围剂量当量率为(1.5±0.1)nSv/h,总中子周围剂量当量率为(2.1±0.1)nSv/h,与中子剂量仪测量值(2.3±0.2)nSv/h基本一致。该文测量结果与相近纬度比较相差不多,可以为评估北京室内环境中子剂量提供参考。A Bonner sphere spectrometer was used to measure indoor natural neutron spectra in Beijing with the neutron energy spectrum obtained using an unfolding procedure with a genetic algorithm.The spectra and fluence-to-dose conversion coefficients gave a neutron flux of 2.83 × 10-3 cm-2· s-1 and a neutron ambient dose equivalent of（1.5±0.1）nSv/h for neutron energy below 20 MeV.The total neutron flux was 3.54×10-3 cm-2·s-1 and the total neutron ambient dose equivalent was（2.1±0.1）nSv/h which are comparable with the dose of（2.3±0.2）nSv/h measured by a3 He neutron monitor. The results are consistent with other measurements at similar latitudes,which verifies the reliability of this instrument and the indoor neutron dose equivalent in Beijing.

关 键 词：多球中子谱仪 环境中子 能谱 遗传算法 中子剂量 

分 类 号：TL72[核科学技术—辐射防护及环境保护]