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Title: Long-term determination of airborne radon progeny concentrations using LR 115 detectors and the effects of thoron
Authors: Choi V.
Ng C.
Lam R.
Janik M.
Sorimachi A.
Kranrod C.
Nikezic, Dragoslav
Shinji T.
YU, Kwan Ngok Peter
Issue Date: 2010
Abstract: The 'proxy equilibrium factor' (Fp) method has been developed for long-term determination of airborne radon progeny concentrations using LR 115 solid-state nuclear track detectors. In this paper, the effects of 220Rn on the Fp method have been studied. The correction to the track density was related to a parameter α which was the ratio of the sum of activity concentrations of alpha-particle emitting radionuclides in the 220Rn decay chain to the activity concentration of 220Rn alone. Under commonly encountered circumstances, α could not be smaller than 2. An attempt was made to verify this using the exposure chamber at the National Institute of Radiological Sciences (NIRS), Chiba, Japan. A most interesting observation of α < 2 for very high 220Rn concentrations and very low equilibrium factors for 220Rn in the exposure chambers was made. A possible explanation was the substantial deposition of 216Po under the extreme conditions inside the exposure chambers. © The Author 2010. Published by Oxford University Press. All rights reserved.
Type: article
DOI: 10.1093/rpd/ncq255
ISSN: 0144-8420
SCOPUS: 2-s2.0-77958579062
Appears in Collections:Faculty of Science, Kragujevac

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