基于半经验法多球中子谱仪校准  

Calibration of Bonner Sphere Spectrometer using semi-empirical method

作　　者：孙博文 曾志[1,2] 张辉[1,2] 马豪[1,2] 李君利[1,2] SUN Bowen;ZENG Zhi;ZHANG Hui;MA Hao;LI Junli(Department of Engineering Physics,Tsinghua University,Beijing 100084;Key Laboratory of Particle&Radiation Imaging(Tsinghua University),Ministry of Education,Beijing 100084)

机构地区：[1]清华大学工程物理系,北京100084 [2]清华大学粒子技术与辐射成像教育部重点实验室,北京100084

出　　处：《辐射防护》2024年第2期120-125,共6页Radiation Protection

摘　　要：基于半经验法扣除中子散射本底,提出了一种多球中子谱仪校准的新方法。首先用热中子参考辐射装置校准多球中子谱仪各中子球内He-3正比计数器的探测效率。用多球中子谱仪各中子球单独测量参考^(241)Am-Be中子源,结合半经验法扣除散射,给出了各中子球的注量响应。结合两者实验结果,获得^(241)Am-Be源能谱并给出谱仪注量响应。结果表明,校准的多球中子谱仪具备快中子区测量能力。A new method for calibrating Bonner Sphere Spectrometer by using semi-empirical method to deduct neutron scattering background was proposed.The detection efficiency of the He-3 proportional counters in each neutron sphere of Bonner Sphere Spectrometer was calibrated by using a thermal neutron reference radiation device.The reference 241 Am-Be neutron source was measured separately by each neutron sphere of the Bonner Sphere Spectrometer,and the fluence response of each neutron sphere was given by using the semi-empirical method to deduct the scattering.Combining the results of two experiments,the energy spectrum of 241 Am-Be neutron field was obtained and the fluence calibration factor of the spectrometer was given.The results also verify the ability of calibrated Bonner Sphere Spectrometer to measure fast neutron field.

关 键 词：多球中子谱仪 校准 中子能谱 半经验法 

分 类 号：TL817[核科学技术—核技术及应用]