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A low background germanium gamma ray spectrometer, GeTHU, has been installedat China JinPing underground Laboratory. The integral background count ratebetween 40 and 2700 keV was 0.6 cpm, and the origin was studied by Monte Carlosimulation. Detection limits and efficiencies were calculated for selectedgamma peaks. Boric acid and silica sand samples were measured and 137Cscontamination was found in boric acid. GeTHU will be mainly used to measureenvironmental samples and screen materials in dark matter experiments.

The characteristics of a low background germanium gamma ray spectrometer at China JinPing underground Laboratory