The dose to cell nuclei in the bronchial airways from the inhalation of 222Rn decay products was calculated using the most recent data for all biological and physical parameters. The major factors that influenced the bronchial dose were the median aerosol diameter, the breathing rate, the unattached fraction, and the depth of the cell nuclei in the airway. The best estimate of the basal cell dose was 6 mGy/WLM in both homes and mines, with a range of 3–15 mGy/WLM. The dose to mucous cell nuclei was about 40% greater.
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Harley et al. (1996) studied this question.