Deposition Analysis Of Unattached Radon Decay Products In Human Respiratory Tract

Radon is a natural radioactive gas derived from geological materials. The greatestrnfraction of the natural radiation exposure in human results from inhalation of thernshort-lived decay products of radon (222Rn), which occur in the free atmospherernand in higher concentrations in the room air of buildings. Inhalation of unattachedrnradon progeny has been implicated in potential health risks of ambient and indoorrnenvironments. These particles deposit in the respiratory tract mainly by diffusion.rnIn this paper, the deposition pattern of unattached radon decay products in thernhuman respiratory tract of adults Caucasian male based on ICRP66 algebraicrnformulas is reviewed. The percentage of deposition fractions for unattached radonrnprogeny in respiratory tract were estimated for best estimation of aerosol parameters,rnwith range of 49.03%–16.70% , 48.29%–19.00%, 2.25%–7.17%, 0.38%–32.04% andrn0.04%–23.40% for nose, mouth, bronchial, bronchiolar and alveolar region, respectively

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