Study of radiation background at the north crossing point of the BEPC in collision mode  

作　　者：莫晓虎 张建勇 张清江 Achasov Mikhail 蔡啸 傅成栋 Harris Fred 刘倩 Muchnoi Nikolay 秦庆 屈化民 王贻芳 徐金强 张天保 

机构地区：[1]Institute of High Energy Physics, Chinese Academy of Sciences [2]Budker Institute of Nuclear Physics [3]Hawaii University

出　　处：《Chinese Physics C》2011年第7期642-655,共14页中国物理C（英文版）

基　　金：Supported by National Natural Science Foundation of China (10491303, 10775412, 10825524);Instrument Developing Project of Chinese Academy of Sciences (YZ200713);Major State Basic Research Development Program (2009CB825200, 2009CB825203,2009CB825206);Knowledge Innovation Project of Chinese Academy of Sciences (KJCX2-YW-N29)

摘　　要：Understanding the radiation background at the north crossing point （NCP） in the tunnel of BEPCII is crucial for the performance safety of the High Purity Germanium （HPGe） detector, and in turn of great significance for long-term stable running of the energy measurement system. Therefore, as the first step, a NaI（T1） detector is constructed to continuously measure the radiation level of photons as background for future experiments. Furthermore, gamma and neutron dosimeters are utilized to explore the radiation distribution in the vicinity of the NCP where the HPGe detector will be located. Synthesizing all obtained information, the shielding for neutron irradiation is studied based on model-dependent theoretical analysis.Understanding the radiation background at the north crossing point （NCP） in the tunnel of BEPCII is crucial for the performance safety of the High Purity Germanium （HPGe） detector, and in turn of great significance for long-term stable running of the energy measurement system. Therefore, as the first step, a NaI（T1） detector is constructed to continuously measure the radiation level of photons as background for future experiments. Furthermore, gamma and neutron dosimeters are utilized to explore the radiation distribution in the vicinity of the NCP where the HPGe detector will be located. Synthesizing all obtained information, the shielding for neutron irradiation is studied based on model-dependent theoretical analysis.

关 键 词：radiation dose shielding thickness photon and neutron background NaI（T1） detector 

分 类 号：O572.214[理学—粒子物理与原子核物理]