Tesfaye, Tilahun (PhD)Degu, Guadie2019-04-222023-11-092019-04-222023-11-092018-07-04http://10.90.10.223:4000/handle/123456789/18100In this work, the regional deposition analysis of attached fraction of radon have been studied. So as to find the regional deposition of the inhaled activity, a fortran code is used. The parameters and the assumptions used in the code were developed by ICRP. The regional deposition from modified parameters were compared with ICRP model deposition. According to the comparison, it was observed that the deposition of attached fraction in the lower (trachea-bronchial) regions of the respiratory tract was found small incontrast their deposition in the extrathoracic (ET) region becomes dominant as aerodynamic diameter of aerosols increases. xienDeposition AnalysisAttached FractionHuman Respiratory TractThesis