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.

Simulation of He(+) induced afterpulses in PMTs.

We report on a Monte Carlo simulation study of afterpulses due to trace gases in EMI 9235QA photomultipliers that are widely used in many luminescence detection systems operating in single photon counting mode. The numerical simulation takes into account the nonuniform electric field distribution and processes including elastic scattering: e + He → e + He, excitation: e + He → e + He(∗), ionization: e + He → 2e + He(+), elastic scattering: He(+) + He → He(+) + He, charge transfer: He(+) + He → Hef + He(+) (Hef indicates a fast neutral) and elastic scattering: Hef + He → Hef + He(f). The simulated and the measured time of flight distributions agree well.

Biocomponent determination in vinegars with the help of 14C measured by liquid scintillation counting.

This article presents a method of carbon extraction from vinegar used in preparation of liquid scintillation counting cocktails for measurements of low (14)C radioactivity. The presented method is relatively fast and can be used to produce liquid scintillation cocktails e.g.