The Significance of Equilibrium and Attachment in Radon Daughter Dosimetry

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Abstract
Published estimates of the conversion coefficient between exposure to potential alpha energy and bronchial dose are reviewed. Values are recommended to calculate dose for domestic exposure, distinguishing between the unattached and attached fractions of potential alpha energy. The data on unattached fraction of potential alpha energy fp and equilibrium factor F under various domestic conditions are also reviewed. The resulting variations in dose per unit exposure to potential alpha energy and in dose per unit exposure to radon gas are examined. It is concluded that dose is better represented by exposure to radon gas. A conversion coefficient of 20 Bq.m-3 = 1 mSv.y-1 between the average radon concentration and the annual effective dose equivalent is recommended to assess exposures in dwellings.

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