title: Thoron, radon and air ions spatial distribution in indoor air.
abstract: Spatial distribution of radioactive gasses thoron (Tn) and radon (Rn) in indoor air of 9 houses mostly during winter period of 2013 has been studied. According to properties of alpha decay of both elements, air ionization was also measured. Simultaneous continual measurements using three Rn/Tn and three air-ion active instruments deployed on to three different distances from the wall surface have shown various outcomes. It has turned out that Tn and air ions concentrations decrease with the distance increase, while Rn remained uniformly distributed. Exponential fittings function for Tn variation with distance was used for the diffusion length and constant as well as the exhalation rate determination. The obtained values were similar with experimental data reported in the literature. Concentrations of air ions were found to be in relation with Rn and obvious, but to a lesser extent, with Tn.
authors.affiliation: Institute of Physics, 11080, Belgrade, Serbia. Electronic address: kolarz@ipb.ac.rs.
authors.forename: Predrag
authors.initials: P
authors.lastname: Kolarž
authors.affiliation: Jožef Stefan Institute, 1000, Ljubljana, Slovenia.
authors.forename: Janja
authors.initials: J
authors.lastname: Vaupotič
authors.affiliation: Jožef Stefan Institute, 1000, Ljubljana, Slovenia.
authors.forename: Ivan
authors.initials: I
authors.lastname: Kobal
authors.affiliation: Institute of Nuclear Sciences Vinčа, University of Belgrade, 11000, Belgrade, Serbia.
authors.forename: Predrag
authors.initials: P
authors.lastname: Ujić
authors.affiliation: Faculty of Medical Sciences, Goce Delcev University, 2000, Štip, Macedonia.
authors.forename: Zdenka
authors.initials: Z
authors.lastname: Stojanovska
authors.affiliation: Institute of Nuclear Sciences Vinčа, University of Belgrade, 11000, Belgrade, Serbia.
authors.forename: Zora S
authors.initials: ZS
authors.lastname: Žunić
mesh_terms: D000396:Air Pollutants, Radioactive / Q000032:analysis*; D016902:Air Pollution, Indoor / Q000032:analysis; D006798:Housing; D011834:Radiation Monitoring; D011886:Radon / Q000032:analysis*; D017687:Radon Daughters / Q000032:analysis*
chemical_list: D000396:Air Pollutants, Radioactive; D017687:Radon Daughters; D011886:Radon
keywords: Air ion concentrations; Radon; Thoron; Thoron diffusion constant; Thoron diffusion length