MC法模拟单球中子谱仪响应函数及其能谱解析  

The Response Simulation and Energy Spectrum of Single-sphere Neutron Spectrometer by MC Method

作　　者：康红斌 赵桂芝[1] 张伟华 丰宝桐[2] 王英杰[2] 李道武[2] 章志明[2] KANG Hong-bin;ZHAO Gui-zhi;ZHANG Wei-hua;FENG Bao-tong;WANG Ying-jie;LI Dao-wu;ZHANG Zhi-ming(Academy of Nuclear Science and Technology,University of South China,Hengyang Hunan 421001,China;Beiing Engineering Research Center of Radiographic Techniques and Equipment,Institute of High Energy Physics,Chinese Academy of Sciences,Beijing 100049,China)

机构地区：[1]南华大学核科学技术学院,湖南衡阳421001 [2]中国科学院高能物理研究所,北京市射线成像技术与装备工程技术研究中心,北京100049

出　　处：《核电子学与探测技术》2020年第2期373-379,共7页Nuclear Electronics & Detection Technology

摘　　要：利用MCNP5模拟分析了不同直径下基于锂玻璃闪烁体的单球中子谱仪的响应函数,能量范围从热能至20MeV;模拟了实验室211Am-Be中子源辐射场.载荷舱内空间辐射场内单球中子谱仪的响应函数;采用UMG少道解谐程序进行了解谱计算。结果显示,人射中子能量低于20MeV时,直径为30cm的单球中子谱仪通过UMG解谱可得到较好的中子能谱解谱结果;载荷舱辐射环境下,含氬量大的舱壁材料对接近单球表面探测器的热中子能区的响应雨数影响最大,对其影响做出修正后可得到一个较好的解谐结果。The MCNP5 was used to analyze the response function(thermal to 20 MeV)of the Single-Sphere Neutron Spectrometer with different diameters based on lithium glass scintillator.The response functions of the single-sphere neutron spectrometer for the 211 Am-Be neutron radiation in the laboratory and the space radiation in the payload bay were simulated respectively.The simulated results were unfolded using the UMG few-channel code to attain the neutron energy spectra.It was found that the single-sphere neutron spectrometer of 30 cm diameter can obtain a neutron energy spectrum close to the incident neutron source(lower than 20 MeV).When the single sphere neutron spectrometer were used to mcasure the space neutron energy spectrum in the payload cabin,the ther mal insulation materials with high hydrogen content had a greatest influence on the thermal neutron response function of the detector near the surface of single-sphere.A better unfolded result can be obtained by correcting the impact of insulation materials.

关 键 词：单球中子谱仪 锂玻璃闪烁体 MC法模拟 解谱 

分 类 号：TL81[核科学技术—核技术及应用]