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Age-dependent inhalation doses to members of the public from indoor short-lived radon progeny.

Radiat. Environ. Biophys. 53, 535-549 (2014)
Postprint DOI
Open Access Green
The main contribution of radiation dose to the human lungs from natural exposure originates from short-lived radon progeny. In the present work, the inhalation doses from indoor short-lived radon progeny, i.e., (218)Po, (214)Pb, (214)Bi, and (214)Po, to different age groups of members of the public were calculated. In the calculations, the age-dependent systemic biokinetic models of polonium, bismuth, and lead published by the International Commission on Radiological Protection (ICRP) were adopted. In addition, the ICRP human respiratory tract and gastrointestinal tract models were applied to determine the deposition fractions in different regions of the lungs during inhalation and exhalation, and the absorption fractions of radon progeny in the alimentary tract. Based on the calculated contribution of each progeny to equivalent dose and effective dose, the dose conversion factor was estimated, taking into account the unattached fraction of aerosols, attached aerosols in the nucleation, accumulation and coarse modes, and the potential alpha energy concentration fraction in indoor air. It turned out that for each progeny, the equivalent doses to extrathoracic airways and the lungs are greater than those to other organs. The contribution of (214)Po to effective dose is much smaller compared to that of the other short-lived radon progeny and can thus be neglected in the dose assessment. In fact, 90 % of the effective dose from short-lived radon progeny arises from (214)Pb and (214)Bi, while the rest is from (218)Po. The dose conversion factors obtained in the present study are 17 and 18 mSv per working level month (WLM) for adult female and male, respectively. This compares to values ranging from 6 to 20 mSv WLM(-1) calculated by other investigators. The dose coefficients of each radon progeny calculated in the present study can be used to estimate the radiation doses for the population, especially for small children and women, in specific regions of the world exposed to radon progeny by measuring their concentrations, aerosol sizes, and unattached fractions.
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Publication type Article: Journal article
Document type Scientific Article
Keywords Biokinetic Model ; Dose Coefficient ; Dose Conversion Factor ; Internal Dosimetry ; Members Of The Public ; Short-lived Radon Progeny; Lung-cancer; Residential Radon; Uncertainty Analysis; Decay Products; Unit Exposure; Conversion Coefficients; Collaborative Analysis; Comparative Dosimetry; Sensitivity-analysis; Biokinetic Model
ISSN (print) / ISBN 0301-634X
e-ISSN 1432-2099
Quellenangaben Volume: 53, Issue: 3, Pages: 535-549 Article Number: , Supplement: ,
Publisher Springer
Publishing Place New York
Reviewing status Peer reviewed