title: Influence of humidity on radon and thoron exhalation rates from building materials.
abstract: The contributions of radon and thoron from building materials to total radon (thoron) entry rates in dwellings range from almost zero to several percent. It is necessary to measure radon and thoron exhalation rates, among other things, to assess the radiological hazard to human health in a living environment. Brick and granite specimens were used to study the changes of these rates as a function of the relative and absolute humidities. Measurement results showed that radon and thoron exhalation rates change to humidity with the same trends as well as effective dose could be changed by the factor of 2 due to this.
authors.affiliation: Research Center for Radiation Protection, National Institute of Radiological Sciences, 4-9-1 Anagawa, Inage-ku, Chiba 263-8555, Japan. Electronic address: mirek@fml.nirs.go.jp.
authors.forename: M
authors.initials: M
authors.lastname: Janik
authors.affiliation: Department of Radiation Physics and Chemistry, School of Medicine, Fukushima Medical University, 1 Hikarigaoka, Fukushima 960-1295, Japan.
authors.forename: Y
authors.initials: Y
authors.lastname: Omori
authors.affiliation: Research Center for Radiation Protection, National Institute of Radiological Sciences, 4-9-1 Anagawa, Inage-ku, Chiba 263-8555, Japan.
authors.forename: H
authors.initials: H
authors.lastname: Yonehara
keywords: Exhalation rate; Humidity; Radon; Thoron