A Monte Carlo study for the shielding of γ backgrounds induced by radionuclides for CDEX

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LI Lei, YUE Qian, TANG Chang-Jian, CHENG Jian-Ping, KANG Ke-Jun, LI Jian-Min, LI Jin, LI Yu-Lan, LI Yuan-Jing, MA Hao, XUE Tao, ZENG Zhi and A Monte Carlo study for the shielding of γ backgrounds induced by radionuclides for CDEX[J]. Chinese Physics C, 2011, 35(3): 282-287. doi: 10.1088/1674-1137/35/3/013
LI Lei, YUE Qian, TANG Chang-Jian, CHENG Jian-Ping, KANG Ke-Jun, LI Jian-Min, LI Jin, LI Yu-Lan, LI Yuan-Jing, MA Hao, XUE Tao, ZENG Zhi and A Monte Carlo study for the shielding of γ backgrounds induced by radionuclides for CDEX[J]. Chinese Physics C, 2011, 35(3): 282-287.  doi: 10.1088/1674-1137/35/3/013 shu
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Received: 2010-06-21
Revised: 2010-11-05
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A Monte Carlo study for the shielding of γ backgrounds induced by radionuclides for CDEX

Abstract: The CDEX (China Dark matter EXperiment) Collaboration will carry out a direct search for WIMPs (Weakly Interacting Massive Particles) using an Ultra-Low Energy Threshold High Purity Germanium (ULE-HPGe) detector at the CJPL (China JinPing deep underground Laboratory). A complex shielding system was designed to reduce backgrounds and a detailed GEANT4 Monte Carlo simulation was performed to study the achievable reduction of γ rays induced by radionuclides and neutron backgrounds by D(γ,n)p reaction. Furthermore, the upper level of allowed radiopurity of shielding materials was estimated under the constraint of the expected goal. Compared with the radiopurity reported by other low-background rare-event experiments, it indicates that the shielding used in the CDEX can be made out of materials with obtainable radiopurity.

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