The influence of radon and thoron exhalation from the walls and the air-exchange upon the Rn (222Rn)- and Tn(220Rn)-concentration indoors has been studied. On the basis of a simple room model the degree of equilibrium between radon, thoron and their decay products, free and attached fraction, has been calculated. These calculations were performed under consideration of: (1) the measured natural radioactive indoor and outdoor aerosol size distribution, (2) the known attachment rate of the uncombined decay products, (3) the experimentally evaluated recoil factor, and (4) of an estimated deposition rate on the wall surface.
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Porstendörfer et al. (1978) studied this question.
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