Bias in U decay chain members measured by γ-ray spectrometry due to Rn leakage.

In this work we investigate and quantify how effectively the noble gas Rn is trapped inside measurement beakers used in high-resolution gamma-ray spectrometry. We test six types of different beakers commonly utilized in γ spectrometry, including one novel construction, the γBeaker. We assessed Rn leakage by injecting Rn rich air into the examined beakers and investigated the abnormal decrease in Rn daughters - Pb and Bi.

Lead shielding efficiency from the gamma background measurements in the salt cavern of the Polkowice-Sieroszowice copper mine.

The studies of lead shielding efficiency from the gamma background measurements were performed in the salt cavern of the copper mine - a site considered for an underground laboratory. Within the energy range of 50-2700 keV, the measured gamma-ray count rates normalized to the mass of the high-purity detectors germanium crystal are 5.93 and 6.