Journal of Environmental Radioactivity, No (181), Year (2018-1) , Pages (62-69)

Title : ( Internal dosimetry of inhaled iodine-131 )

Authors: Mitra Kiani , Laleh Rafat Motavali , Seyyed Hashem Miri Hakimabad ,

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Abstract

In this paper, the dose assessment for the iodine inhalation exposure in 19 aerosol sizes and three gas/vapor forms at three levels of thyroid uptake, was performed. Two different modes of work (light vs. heavy) and breathing (nose vs. mouth) for aerosol inhalation were investigated. In order to calculate the cumulated activities per unit of inhaled activity, a combined model which included the latest models of both human respiratory and alimentary tract was developed. The S values for 131I were computed based on the ICRP adult male and female reference voxel phantoms by the Monte Carlo method. Then, the committed equivalent and committed effective dose coefficients were obtained (The data are available at http://www.um.ac.ir/∼mirihakim). In general, for the nonzero thyroid uptakes, the maximum cumulated activity was found in the thyroid. When the thyroid is blocked, however, the maximum depends on the work and breathing mode and radioisotope form. Overall, the maximum CED coefficient was evaluated for the inhalation of elemental iodine at thyroid uptake of ∼27% (2.8 × 10−8 Sv/Bq). As for the particle inhalation per se, mouth breathing of 0.6 nm and 0.2 μm AMTD particles showed to have the maximum (2.8 × 10−8 Sv/Bq) and minimum (6.4 × 10−9 Sv/Bq) CED coefficients, respectively. Compared to the reference CED coefficients, the authors found an increase of about 58% for inhalation of the aerosols with AMAD of 1 μm and 70% for 5 μm.

Keywords

, Inhalation, Dose coefficient, 131I, Aerosol size, Gas, Nose/mouth, Biokinetic model, Voxel phantoms
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@article{paperid:1067094,
author = {Kiani, Mitra and Rafat Motavali, Laleh and Miri Hakimabad, Seyyed Hashem},
title = {Internal dosimetry of inhaled iodine-131},
journal = {Journal of Environmental Radioactivity},
year = {2018},
number = {181},
month = {January},
issn = {0265-931X},
pages = {62--69},
numpages = {7},
keywords = {Inhalation; Dose coefficient; 131I; Aerosol size; Gas; Nose/mouth; Biokinetic model; Voxel phantoms},
}

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%0 Journal Article
%T Internal dosimetry of inhaled iodine-131
%A Kiani, Mitra
%A Rafat Motavali, Laleh
%A Miri Hakimabad, Seyyed Hashem
%J Journal of Environmental Radioactivity
%@ 0265-931X
%D 2018

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