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Radiation Protection Dosimetry Advance Access originally published online on June 21, 2005
Radiation Protection Dosimetry 2005 117(4):382-394; doi:10.1093/rpd/nci314
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© The Author 2005. Published by Oxford University Press. All rights reserved. For Permissions, please email: journals.permissions@oxfordjournals.org

Microdosimetry of radon progeny alpha particles in bronchial airway bifurcations

H. Fakir1,2,*, W. Hofmann2 and I. Aubineau-Lanièce1

1 Division of Physics and Biophysics, Department of Molecular Biology, University of Salzburg, Hellbrunner Strasse 34, A-5020 Salzburg, Austria
2 Institut de Radioprotection et de Sûreté Nucléaire, DRPH/SDI, B.P. No. 17, F-92262, Fontenay-aux-Roses Cedex, France

* Corresponding author: hatim.fakir{at}sbg.ac.at

Received March 7, 2005, amended May 23, 2005, accepted May 30, 2005

A Monte Carlo code, initially developed for the calculation of microdosimetric spectra for alpha particles in cylindrical airways, has been extended to allow the computation of microdosimetric parameters for multiple source–target configurations in bronchial airway bifurcations. The objective of the present study was to investigate the effects of uniform and non-uniform radon progeny surface activity distributions in symmetric and asymmetric bronchial airway bifurcations on absorbed dose, hit frequency, lineal energy, single hit specific energy and LET spectra. In order to assess the effects of multiple hits, dose-dependent specific energy spectra were calculated by solving the compound Poisson process by iterative convolution. While the simulations showed significant differences of cellular dose quantities at different cell locations for uniformly distributed surface activities, even higher variations, as high as several orders of magnitude, were observed for non-uniform surface activity distributions, depending on the location of the cell and the local activity distribution.


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