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Unattached fraction of radon decay products as a crucial parameter for radon dosimetry in Postojna Cave
Janja Vaupotič, Ivan Kobal - (33/1,2004)
Short-term summer and winter monitoring was carried out at the lowest point in Postojna cave, on air concentrations on radon (CRn) and radon decay products (CRnDP), the equilibrium factor (F) and unattached fraction of radon decay products (fun), barometric pressure (P), relative air humidity in the cave (RH) and air temperature outside (Tout) and in the cave (Tin), with the emphasis on fun. Dose conversion factors (DCF) for mouth and nasal breathing were calculated from the fun values (ranging from 0.10 to 0.68) and effective doses for the employees in the cave were obtained. These significantly exceed the doses based on the ICRP-65 methodology now in use.
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