基于Bonner多球的环境中子能谱和剂量率测量  

Measurement of spectrum and dose rate of natural neuron using bonner spheres

作　　者：祝庆军[1,2] 宋逢泉[1,2] 郭倩[1,2] 廖燕飞[2] 宋钢[2] FDS团队 

机构地区：[1]中国科学技术大学,安徽合肥230026 [2]中国科学院核能安全技术研究所,安徽合肥230031

出　　处：《核科学与工程》2013年第1期49-54,共6页Nuclear Science and Engineering

基　　金：国家自然科学基金(No.30900386);中国科学院战略性先导科技专项(No.XDA03040000)

摘　　要：使用Bonner谱仪对室内中子谱进行测量。根据Bonner多球的读数,采用最大熵法求解中子能谱,并根据注量-剂量转换系数得到中子剂量率。为验证测量结果,使用基于解析公式的模拟软件EXPACS Ver2.21进行能谱验证、使用BF3固定式环境中子监测器进行剂量率验证。经过验证分析表明基于最大熵法的Bonner测量结果与其他方法的结果基本符合,合肥地区环境中中子周围剂量当量率在2.6nSv.h-1至14.38nSv.h-1之间。The natural neutron spectrum indoor was measured by using Bonner spheres spectrometer in Hefei. A Bonner sphere spectrometer with maximum entropy method was used to unfold neutron spectrum. Then according to the fluence to dose coefficient, the dose rate was calculated. The software EXPACS Ver2.21 based on the analytic methods for simulating the natural neutron spectrum was adopted to verify the neutron spectrum, and the BFa natural neutron monitors were used to confirm the effective dose rate. The verification and analysis indicated that the results from Bonner spheres spectrometer consistent with others. The ambient dose equivalent rate of neutron in Hefei was between 2.6 nSv · h-1and 14.38 nSv· h-1.

关 键 词：最大熵法 Bonner多球 环境中子 中子能谱 

分 类 号：O536[理学—等离子体物理]