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Specific properties of a model of thoron and its decay products in indoor atmospheres.
Nukleonika 55, 463-469 (2010)
Publ. Version/Full Text
Whereas several models of indoor concentrations of radon and its decay products exist, models for the occurrence and spatial distribution of thoron (Rn-220) and its decay products are lacking. This study highlights the specific properties of the thoron decay chain and presents their consequences for a thoron model. The short half-life of thoron results in an inhomogeneous spatial distribution, which is determined by diffusive and advective transport. The long half-life of the decay product Pb-212 accounts for a strong influence of air exchange on its overall concentration as well as on its unattached fraction. It could further be predicted that also the unattached part of Pb-212 is distributed inhomogeneously. The theoretical structure of a thoron model, which can neglect the most short-lived decay products but must account for the influence of air exchange in a stronger way than it is the case for radon, results from these considerations.
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Publication type
Article: Journal article
Document type
Scientific Article
Keywords
thoron; Rn-220; radon; indoor model; decay products; air exchange; spatial distribution
ISSN (print) / ISBN
0029-5922
e-ISSN
1508-5791
Journal
Nukleonika
Quellenangaben
Volume: 55,
Issue: 4,
Pages: 463-469
Publisher
Institute of Nuclear Chemistry and Technology (INCT)
Non-patent literature
Publications
Reviewing status
Peer reviewed
Institute(s)
Institute of Radiation Protection (ISS)