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Please use this identifier to cite or link to this item: http://hdl.handle.net/123456789/4232

Title: RADON PROGENY DEPOSITION IN RESPIRATORY TRACT: COMPARATIVE ANALYSIS OF MODELS
Authors: Tamiru, Bayissa
Advisors: Dr. Tilahun Tesfaye
Keywords: aerosols
aerodynamic diameter
Copyright: Jun-2011
Date Added: 8-Dec-2012
Publisher: A.A.U
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: A Thesis Submitted to the School of Graduate Studies Addis Ababa University in Partial Ful_llment of the Requirement for the Degree of Master of Science in Physics
URI: http://hdl.handle.net/123456789/4232
Appears in:Thesis - Physics

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