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The China Dark Matter Experiment (CDEX) is located at the China Jinpingunderground laboratory (CJPL) and aims to directly detect the WIMP flux withhigh sensitivity in the low mass region. Here we present a study of thepredicted photon and electron backgrounds including the background contributionof the structure materials of the germanium detector, the passive shieldingmaterials, and the intrinsic radioactivity of the liquid argon that serves asan anti-Compton active shielding detector. A detailed geometry is modeled andthe background contribution has been simulated based on the measuredradioactivities of all possible components within the GEANT4 program. Then thephoton and electron background level in the energy region of interest (<10^-2events kg-1 day-1 keV-1 (cpkkd)) is predicted based on Monte Carlo simulations.The simulated result is consistent with the design goal of CDEX-10 experiment,0.1 cpkkd, which shows that the active and passive shield design of CDEX-10 iseffective and feasible.

Study of the material photon and electron background and the liquid argon detector veto efficiency of the CDEX-10 experiment