一种宽能谱多球中子谱仪的研制  

Research and Development of a Neutron Multi-sphere Spectrometer

作　　者：付鑫[1,2] 李宗强[1] 徐俊奎[1,3] 李武元[1,2] 苏有武[1] 毛旺[1,4] 严维伟 徐翀[1,2] 庞成果 

机构地区：[1]中国科学院近代物理研究所,兰州730000 [2]中国科学院大学,北京100049 [3]兰州大学,兰州730000 [4]西北师范大学,兰州730000 [5]中国科学技术大学,合肥230026

出　　处：《原子核物理评论》2016年第4期466-470,共5页Nuclear Physics Review

基　　金：国家重大科学仪器设备开发专项(编号2011YQ120096)~~

摘　　要：利用蒙特卡罗程序MCNPX模拟计算了纯聚乙烯球和加入辅助材料的聚乙烯球对不同能量中子的响应函数曲线,使用计算出来的响应函数作为U-M-G软件解谱所需输入文件。研发了一套专门为此多球谱仪进行数据采集的放大甄别一体化电路,该电路可为SP9管提供900 V的工作高压,甄别阈设为0.5 V,总的放大倍数为200倍。使用研制的Bonner球谱仪对已知源强的Pu-Be中子源进行能谱测量,测量结果显示解出的能谱数据与实际Pu-Be源中子能谱较为符合,实验结果验证了该套多球谱仪可用于测量Pu-Be能区的中子谱。Neutron response of Bonner spheres which include pure polyethylene and polyethylene with auxiliary material was calculated with Monte Carlo code MCNPx, the calculated response was used as the input file of U-M-G code for neutronspectrum unfolding. A special screening of amplification integrated circuits was developed, which can provides high voltage 900 V working for the SP9 tube, the screening threshold is set to 0.5V and total magnification is 200. Neutron energy spectrum of a Pu-Be source were measured with the developed Bonner spheres spectrometer,good agreement was found in the measured result of the spectrum datasolutionand the real spectrum, which indicated that the multi-sphere spectrometer was reliable in the neutron measurement at energy region of Pu-Be neutron source.

关 键 词：球中子谱仪 U-M-G 能量响应函数 MCNPX 

分 类 号：TL77[核科学技术—辐射防护及环境保护]