An evaluation of thoron (and radon) equilibrium factorclose towalls based on long-term measurements in dwellings

Mishra, Rosaline and Zunic, Zora S. and Venoso, Gennaro and Bochicchio, Francesco and Stojanovska, Zdenka and Carpentieri, Carmela and Prajith, R. and Sapra, B.K. and Mayya, Y.S. and Ishikawa, T. and Omori, Y. and Veselinovic, Nenad and Tollefsen, Tore and Ujic, P. and Bossew, Peter (2014) An evaluation of thoron (and radon) equilibrium factorclose towalls based on long-term measurements in dwellings. Radiation Protection Dosimetry. pp. 1-5. ISSN 0144-8420

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Abstract

Thoron gas and its progeny behave quite differently in room environments, owing to the difference in their half-lives; therefore, it is important to measure simultaneously gas and progeny concentrations to estimate the time-integrated equilibrium factor. Furthermore, thoron concentration strongly depends on the distance from the source, i.e. generally walls in indoor environments. In the present work, therefore, the measurements of both thoron and radon gas and their progeny concentrations were consistently carried out close to the walls, in 43 dwellings located in the Sokobanja municipality, Serbia. Three different types of instruments have been used in the present survey to measure the time-integrated thoron and radon gas and their progeny concentrations simultaneously. The equilibrium factor for thoron measured ‘close to the wall’, FW Tn, ranged from 0.001 to 0.077 with a geometric mean (GM) [geometric standard deviation (GSD)] of 0.006 (2.2), whereas the equilibrium factor for radon, FRn, ranged from 0.06 to 0.95 with a GM (GSD) of 0.23 (2.0).

Item Type: Article
Subjects: Natural sciences > Physical sciences
Divisions: Faculty of Medical Science
Depositing User: Zdenka Stojanovska
Date Deposited: 11 Jun 2014 11:19
Last Modified: 30 Oct 2014 10:25
URI: http://eprints.ugd.edu.mk/id/eprint/10047

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