Abstract
The sensitivity to different relevant parameters of the absorbed fractionof alpha particles emitted from the 222Rn chain in sensitive cells of thetracheo-bronchial tree have been investigated. The structure of the airwaywall given by ICRP (ICRP66) has been adopted and employed in the presentcalculations. The source thickness (mucous gel and sol + cilia), target layer thickness and the depth of the sensitive layers havebeen varied within reasonable ranges around the default values recommendedby ICRP66. The results have shown that the depth of the sensitive layers isthe most important parameter in calculating the absorbed fraction. Inaddition, dose conversion coefficients were calculated and presented alongwith the absorbed fractions.
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