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Radiation Protection Dosimetry Advance Access originally published online on July 20, 2004
Radiation Protection Dosimetry 2004 111(2):221-228; doi:10.1093/rpd/nch329
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Radiation Protection Dosimetry Vol. 111, No. 2 © Oxford University Press 2004; all rights reserved

Evaluation of indoor gamma radiation dose in dwellings

Marcelo Francis Máduar and Goro Hiromoto

Instituto de Pesquisas Energéticas e Nucleares, Av. Prof. Lineu Prestes, 2242–Cidade Universitária, 05508-000 São Paulo, SP, Brazil

* Corresponding author: mmaduar{at}iper.br

The use of materials containing naturally occurring radionuclides for house construction may enhance the natural radiation background to which some population groups are exposed. External exposure results from gamma emitter radionuclides existing in the walls, floor and ceiling. Mathematical models can be used to predict external dose rates inside a room, provided the compartment geometry and the radionuclide concentration activities are known. This paper presents a methodology and a computer code for theoretical evaluation of indoor external gamma doses in the air. The room was modelled as three pairs of rectangular slabs of finite thickness. Doses were evaluated by applying a photon transport model, taking into account self-absorption and radiation build-up. Calculations were performed for 40K, 226Ra and 232Th, considering concrete walls. The results obtained show good agreement with those reported in the literature. Dose conversion factors are presented in a practical manner, ready to use for radiological impact screening.


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