Environmental control of the German radon reference chamber

Testing of thoron cross-interference of continuous radon measuring instruments

“…The tubing used in the set-up was the clear PVC metric tubing (Thermo Scientific/Nalgene). PVC has lower radon leakage rates than, for example, silicon rubber, norprene, or tygon (8). At SUBG, the thoron atmosphere was created in a 50.4 L Emanation Calibration Container (Saphymo GmbH).…”

Current Status of Rn-220 Chamber Carrier Aerosol Modulation Research

“…In 1998, radon and its progeny were measured in a radon standard chamber with different α and γ spectrophotometric systems, controlling a full set of environmental parameters such as temperature, humidity, air pressure and aerosol concentration (Honig et al, 1998). A new calibration device for measuring Rn-220 activity concentration in air was developed in 2003 (Gargioni et al, 2003).…”

Effect of air on gas amplification characteristics in argon–propane (1%)-based proportional counters for airborne radon monitoring

“…In fact, it is rather difficult to perform a spectroscopy in open air, due to the presence of oxygen, water vapor and other electronegative gas traces. Nevertheless, some research groups have already made significant progress in this direction [3][4][5][6][7][8][9] and some results are briefly reviewed below.…”

“…He first filled a proportional counter with an air sample and then evacuated the counter after periods of time between 30 and 216 min, immediately introduced P-10 gas, a standard counting gas (argon-methane (90-10%)), to detect the alphas emitted by the radon decay products. Unfortunately, in addition to the fact that this method cannot provide on-line measurements, it has also a major drawback of fundamental importance: the equilibrium factors are not exactly known [6]. In order to make on-line medium-level measurements of radon activity, Rottger et al [7] also used a multi-wire pulse ionization chamber, similar to the one described by Baltzer.…”