COMBINED LSC-BASED METHOD FOR RADON IN AIR MEASUREMENTS

A combined method for 222Rn measurement in air based on liquid scintillation counting (LSC) is proposed. It
is an integral and a highly sensitive method, capable for different 222Rn measurement applications. The first method is based
on a charcoal trapping. The second method (Kaihola et al. 1992; Kaihola 1996) is based on a plastic scintillation material
(MeltilexTM)-coated scintillation vial. This method is a scintillation vial method for 222Rn measurements like the Lucas chamber
method. Both methods utilize modern LSC techniques and PTFE vials. One essential aim was to perform in situ calibration
of the charcoal-based method for any weather conditions. We tested the method on both a Quantulus 1220 and a Triathler
counter. The corresponding sensitivity is ~0.1 cpm per Bq m−3 for 1 day of exposure.