基于金活化片的单球谱仪研制及能谱测量  

Development of Single Sphere Spectrometer Based on Gold Foils and Research on Spectrometry

作　　者：肖凯歌 李玮[1] 焦听雨 李晓博 秦茜 李世垚 刘蕴韬[1] XIAO Kaige;LI Wei;JIAO Tingyu;LI Xiaobo;QIN Xi;LI Shiyao;LIU Yuntao(National key Laboratory for Metrology and Calibration Techniques,China Institute of Atomic Energy,Beijing 102413,China)

机构地区：[1]中国原子能科学研究院计量与校准技术重点实验室,北京102413

出　　处：《同位素》2023年第1期1-8,I0001,共9页Journal of Isotopes

摘　　要：中国先进研究堆(CARR)H-8水平孔道是提供中子的实验孔道,可以提供稳定的辐射场,对于不同的中子实验,其所需的中子能谱谱形不同,准确测量中子能谱具有重要意义。为测量H-8水平孔道中子能谱,研制一种以金活化片为热中子探测器的被动式单球中子能谱仪,使用MCNP程序对10-11~15 MeV能区的中子能量响应进行计算,并分析能量响应的合理性。在CARR堆导管大厅对单球谱仪进行测试实验,使用高纯锗探测器测量各金活化片活度,使用UGA(unfolding based on genetic algorithm)解谱程序对实验数据进行解谱计算。结果表明,导管大厅出射中子能量在10-9~10-6 MeV范围内,单球中子谱仪可以较为精确的给出中子能谱数据,适用于CARR堆H-8水平孔道中子能谱测量研究。The H-8 horizontal channel of CARR is an experimental channel to provide neutrons,which can provide a stable radiation field.For different neutron experiments,the required neutron energy spectrum shapes are often different,so accurate measurement of neutron energy spectrum is of great significance.A passive single sphere neutron spectrometer with gold foils as thermal neutron detector is developed to measure the neutron energy spectrum of H-8 horizontal channel.The neutron energy response in 10-11-15 MeV is calculated by MCNP and the rationality of the energy response is analyzed.The single sphere spectrometer was tested in the conduit hall of CARR,the activity of each gold foil was measured by high-purity germanium detector,and the experimental data were calculated by UGA(unfolding based on genetic algorithm).The results show that the neutron energy range emitted from the conduit hall is 10-9-10-6 MeV and the single sphere neutron spectrometer can give accurate neutron energy spectrum data,and can be applied to the measurement and research of neutron energy spectrum in H-8 horizontal channel of CARR.

关 键 词：单球中子谱仪 金活化片 中子注量 能量响应 解谱 

分 类 号：TL816[核科学技术—核技术及应用]