Deposition Analysis of Unattached Radon Decay Products In Human Respiratory Tract
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Date
2018-07-03
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Addis Ababa University
Abstract
Radon is a natural radioactive gas derived from geological materials. The greatest
fraction of the natural radiation exposure in human results from inhalation of the
short-lived decay products of radon (222Rn), which occur in the free atmosphere
and in higher concentrations in the room air of buildings. Inhalation of unattached
radon progeny has been implicated in potential health risks of ambient and indoor
environments. These particles deposit in the respiratory tract mainly by diffusion.
In this paper, the deposition pattern of unattached radon decay products in the
human respiratory tract of adults Caucasian male based on ICRP66 algebraic
formulas is reviewed. The percentage of deposition fractions for unattached radon
progeny in respiratory tract were estimated for best estimation of aerosol parameters,
with range of 49.03%–16.70% , 48.29%–19.00%, 2.25%–7.17%, 0.38%–32.04% and
0.04%–23.40% for nose, mouth, bronchial, bronchiolar and alveolar region, respectively
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Keywords
Deposition Analysis, Unattached Radon, Decay Products, Human, Respiratory, Tract