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Radiation Protection Dosimetry Advance Access originally published online on April 7, 2006
Radiation Protection Dosimetry 2006 121(3):252-256; doi:10.1093/rpd/ncl039
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© The Author 2006. Published by Oxford University Press. All rights reserved. For Permissions, please email: journals.permissions@oxfordjournals.org

Charged particle equilibrium effects on the electron absorbed fraction in the extrathoracic airways

H. M. Moussa1, K.F. Eckerman2 and L. W. Townsend1,*

1 University of Tennessee, Department of Nuclear Engineering, Knoxville, TN 37996-2300, USA
2 Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA

* Corresponding author: ltownsen{at}tennessee.edu

Received January 6, 2006, amended February 24, 2006, accepted March 5, 2006


  Abstract

Estimates of the dose to the extrathoracic airway (nasal vestibule) from inhaled beta-emitting radionuclides, obtained using the respiratory tract model presented in Publication 66 of the International Commission on Radiological Protection, frequently predict that the basal cells in this region are the most highly irradiated tissues of the body. The dose to the basal cells is averaged over a layer of tissue 10 µm thick located at a depth of 40 µm into the airway assuming that charged particle equilibrium exists. Since the target (basal cell layer) is very small and thin (10 cm2 area and 10 µm thickness), charged particle equilibrium does not exist. In this work the effect on the absorbed fraction of the lack of charged particle equilibrium is investigated.


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