Absorbed fraction of alpha-particles emitted in bifurcation regions of the human tracheo-bronchial tree

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review

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Original languageEnglish
Pages (from-to)49-53
Journal / PublicationRadiation and Environmental Biophysics
Volume42
Issue number1
Publication statusPublished - Mar 2003

Abstract

A model for bifurcation regions of the human tracheo-bronchial tree was developed. Equations for the suffaces are given to enable calculations of doses from alpha-particles emitted in these regions. It has been found that a bifurcation region is well approximated by a quasiellipsoid. The absorbed fractions of alpha-particles emitted in bifurcation regions were calculated by the Monte Carlo method. The average absorbed fraction under the bifurcation geometry is close to that found under the cylindrical geometry in the bronchial region. In the bronchiolar region, the absorbed fractions under the bifurcation geometry are up to 20% larger than those under the cylindrical geometry. © Springer-Verlag 2003