Bonner球谱仪对Pu-Be源中子能谱的测量  

Measurement of neutron energy spectrum of a Pu-Be source based on Bonner spheres spectrometer

作　　者：宋逢泉[1,2] 祝庆军[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60-64,共5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：Bonner球谱仪是开展中子能谱测量的重要仪器,本文利用自行研制的Bonner球谱仪对已知源强的Pu-Be中子源进行能谱测量,以验证谱仪测量方法和中子能谱解谱方法的准确性。首先制作出由8个球组成的Bonner球谱仪,再根据谱仪的测量读数,采用最大熵法获得中子能谱信息,与国际原子能机构公布的数据基本符合,进一步计算得到所测Pu-Be中子源的中子周围剂量当量转换系数为0.37nSv.cm2,与目前已经公布的数值0.36nSv.cm2基本一致,表明求解出的能谱测量数据基本符合物理事实,测量所使用的Bonner谱仪和解谱方法的准确可靠性。The neutron energy spectrum and dose of a Pu-Be source were measured to test the Bonner spheres spectrometer and unfolding methods built in this work. The Bonner spheres spectrometer is composed of eight spheres. Based on the counts of these spheres, the maximum entropy method was used to acquire the neutron energy spectrum data. The result is accorded with the data published by the International Atomic Energy Agency. Then the fluence-to-ambient dose equivalent conversion coefficients of the Pu- Be source was calculated by the measured energy spectrum data. The calculated value is 0.37 nSv · cm2 which is consistent with the known value 0.36 nSv· cm2. It indicated that the reliability of the results from Bonnet spheres spectrometer and the maximum entropy unfolding codes were verified.

关 键 词：Bonner球谱仪 最大熵法 中子能谱 

分 类 号：O536[理学—等离子体物理]