Evaluation of cosmogenic activation of copper and germanium during production in Jinping Underground Laboratory  

作　　者：Wei-He Zeng Hao Ma Ming Zeng Zhi Zeng Qian Yue Jian-Ping Cheng Jun-Li Li 

机构地区：[1]Department of Engineering Physics,Tsinghua University,Beijing 100084,China [2]Key Laboratory of Particle and Radiation Imaging(Tsinghua University),Ministry of Education,Beijing 100084,China [3]College of Nuclear Science and Technology,Beijing Normal University,Beijing 100875,China

出　　处：《Nuclear Science and Techniques》2020年第5期70-76,共7页核技术（英文）

基　　金：supported by the National Natural Science Foundation of China(No.U1865205).

摘　　要：Intrinsic radiation of materials is one of the major backgrounds for many rare-event search experiments.Thus,the production of pure materials in an underground laboratory is a promising approach for eliminating cosmogenic radionuclides.In this paper,we demonstrate a procedure to evaluate the yields of cosmogenic radionuclides in copper and germanium in the second phase of the China Jinping Underground Laboratory.Our results show that for copper and germanium materials,the largest cosmogenic background comes from 3 H and57,58,60Co,and 3 H and 68Ge,respectively,which all have yields on the order of 10-7 kg-1 day-1.The corresponding radioactivities after 90 days pf exposure underground are estimated to be lower than 10-6μBq kg-1.

关 键 词：COSMIC RAYS COSMOGENIC radionuclides UNDERGROUND laboratory MONTE Carlo simulation 

分 类 号：P172.4[天文地球—天文学]