RADON
DOSES BASED ON ALPHA SPECTROMETRY
Janja Vaupotič,* Ivan Kobal
Jožef Stefan Institute, Jamova 39, SI-1000
Abstract
At the railway
station in Postojna Cave and at the lowest point of
the cave, repeated short-term monitoring in summer and in winter of air
concentrations of radon (CRn) and radon
decay products (CRnDP), of the equilibrium
factor (F) and unattached fraction of radon decay products (fun), of
barometric pressure (P), relative air humidity in the cave (RH) and air
temperature outside (Tout) and in the cave (Tin) has been
carried out, with the emphasis on fun. Dose conversion factors
(DCF), calculated from the fun values (ranging from 0.09 to 0.65)
exceed the ICRP-65 value of 5 mSv/WLM by a factor of
12-14 in summer and of 3.0-3.5 in winter.
Key words: radon decay products, unattached fraction,
dose conversion factors