Radiation Dose to the Human ResPiratory Tract from Inhalation of Radon-222 and its Progeny

摘要

In this article the regional dose equivalent for exposure to I working level month (WLM), the annual effective dose equivalent and the dose equivalent conversion factor due '/0 the inhalation of short-lived radon progeny (↑(218)po, ↑(214)pb and ↑(214)Bi/↑(214)po) are calculated with a dosimetric model. Experimental results of aerosol size characteristics, unattached activity fractions, equilibrium factors, and activity size distributions of the short-lived radon progeny m indoor and outdoor atmosphere are summarized. Dose calculaticns based on these results show that the changes in dose rate values are influenced by the different model assumptions concerning deposition probabilities of aerosol particles in the respiratory system during inhalation, the sensitivity of different cells(epithelial, basal) to radiation and assuming nose or mouth breathing. The inverse relationship between the unattached fraction of potential alpha-panicle energy in room air and the radioactive equilibrium between radon gas and its progeny indicates that dose equivalent is closely related to the concentration of radon gas averaged over a period of exposure. #1098 Elsevier Science Ltd. All rights reserved