Material Screening with HPGe Counting Station for PandaX Experiment

Abstract

A gamma counting station based on high-purity germanium (HPGe) detector was set up for the material screening of the PandaX dark matter experiments in the China Jinping Underground Laboratory. Low background gamma rate of 2.6 counts/min within the energy range of 20 to 2700 keV is achieved due to the well-designed passive shield. The sentivities of the HPGe detetector reach mBq/kg level for isotopes like K, U, Th, and even better for Co and Cs, resulted from the low-background rate and the high relative detection efficiency of 175%. The structure and performance of the counting station are described in this article. Detailed counting results for the radioactivity in materials used by the PandaX dark-matter experiment are presented. The upgrading plan of the counting station is also discussed.

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• Design and Commissioning of the PandaX-4T Cryogenic Distillation System for Krypton and Radon Removal
• Inelastic dark matter nucleus scattering
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• Assay of low-background stainless steel by smelting for the neutrino experiment at Jinping
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