Abstract
In the first part of the paper, the parameters of the airborne radon daughters for dose estimation are defined. In the second part, the most important methods and techniques for measurement of the potential alpha energy concentration, the unattached fraction (cluster-fraction), and the activity size distribution of the radon decay products are reported. At the end, the dose conversion factor for different exposure situations obtained from model calculations are presented. These values vary between 6 mSv/WLM and 39 mSv/WLM depending on aerosol condition and Physiological parameters of inhalation (inhalation rate, nose/mouth breathing) at different places (home, open air, working places). These factors are based on the new human respiratory tract model of ICRP 66, taking into account the different radon daughter characteristics.
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