Radon Progeny Deposition in Respiratory Tract: Comparative Analysis of Models
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Date
2011-07
Authors
Bayissa, Tamiru
Journal Title
Journal ISSN
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Publisher
Addis Ababa University
Abstract
Cheng (2003) model of the extra-thoracic respiratory tract was used to calculate
the deposition efficiency of aerosols of aerodynamic diameter ranging from 0.1 m
to 72 m. The model assumes the deposition in the extra-thoracic region is mainly
due to nasal airway geometry and the critical dimension is the minimum crosssectional
area in the nasal passage. A dimensionless Stokes number is calculated
as a function of the the aerodynamic diameter (da), flow rate (Q), and the minimum
cross-sectional area (Amin). Literature value of Amin = 1:61 cm2 was used in the
calculation of Stockes number.
The calculation done using this model agrees with the predictions of the ICRP
1994 respiratory tract model. Further this model gives good agreement to the
experimental results available in literature by introducing adjusting parameters
for breathing rate and specific geometries of individuals
Description
Keywords
Radon Progeny Deposition