Speaker
Description
The contribution reports about the commissioning of an ultra low-level 𝛾-ray counting setup in the shallow-underground laboratory Felsenkeller in Dresden, Germany. It includes a high-purity germanium detector of 163$\,$% relative efficiency within passive and active shields. The passive shield consists of 45$\,$m rock overburden (140 meters water equivalent), 40cm of low-activity concrete, 15 cm of high purity lead, 10 cm of oxygen-free radiopure copper, and an anti-radon box. The active veto is realized by five large plastic scintillation panels surrounding the setup. All together, these shieldings attenuate the remaining background rate down to 116(1)$\,$kg$^{−1}$d$^{−1}$ in an energy interval of [40$\,$keV;2700$\,$keV]. This is the lowest background of any HPGe detector in Germany, among the lowest worldwide, and enables studies of samples well below 1$\,$mBq. In addition to the design of the setup, the underlying analysis techniques will be presented.
| Submitted on behalf of a Collaboration? | No |
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