Low-level gamma-ray spectrometry at the underground laboratory Garching

摘要

Two low-background setups for material screening based on HPGe detectors were built in the Garching Underground Laboratory with an overburden of similar to 10 m.w.e. They indude several layers of passive shielding as well as an active muon veto. The first setup (GEM) comprises a 150% efficiency HPGe detector which can optionally be surrounded by a NaI(Tl) scintillation detector that serves as anti-Compton veto. The second setup (LoAx) consists of two smaller HPGe detectors which are arranged face-to-face to cover a larger solid angle around the sample and to allow coincidence measurements.