RADON DOSES BASED ON ALPHA SPECTROMETRY
Janja Vaupotič,* Ivan Kobal
Jožef Stefan Institute, Jamova 39, SI-1000
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