Abstract
The dose per exposure unit of the short-lived radon and thoron decay products was calculated using a dosimetric approach. The calculations are based on a lung dose model with the structure that is related to the ICRP 66 respiratory tract model. The dose relevant parameters, unattached fraction of the decay product clusters (fp) and size distribution of the unattached and aerosol-attached decay products for different living and working places are reported. Taking into account these characteristics the dose conversion factors (DCF) of the radon and thoron decay products were estimated. In addition, the living and working places were divided concerning their aerosol parameters like particle number concentration and activity size distribution.
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