title: Radiation dose due to radon and thoron progeny inhalation in high-level natural radiation areas of Kerala, India.
abstract: In order to evaluate internal exposure to radon and thoron, concentrations for radon, thoron, and thoron progeny were measured for 259 dwellings located in high background radiation areas (HBRAs, outdoor external dose: 3-5 mGy y-1) and low background radiation areas (control areas, outdoor external dose: 1 mGy y-1) in Karunagappally Taluk, Kerala, India. The measurements were conducted using passive-type radon-thoron detectors and thoron progeny detectors over two six-month measurement periods from June 2010 to June 2011. The results showed no major differences in radon and thoron progeny concentrations between the HBRAs and the control areas. The geometric mean of the annual effective dose due to radon and thoron was calculated as 0.10 and 0.44 mSv, respectively. The doses were small, but not negligible compared with the external dose in the two areas.
authors.affiliation: Research Center for Radiation Protection, National Institute of Radiological Sciences, 4-9-1 Anagawa, Inage-ku, Chiba 263-8555, Japan. Current address: Department of Radiation Physics and Chemistry, Fukushima Medical University, 1 Hikarigaoka, Fukushima 960-1295, Japan.
authors.forename: Yasutaka
authors.initials: Y
authors.lastname: Omori
authors.forename: Shinji
authors.initials: S
authors.lastname: Tokonami
authors.forename: Sarata Kumar
authors.initials: SK
authors.lastname: Sahoo
authors.forename: Tetsuo
authors.initials: T
authors.lastname: Ishikawa
authors.forename: Atsuyuki
authors.initials: A
authors.lastname: Sorimachi
authors.forename: Masahiro
authors.initials: M
authors.lastname: Hosoda
authors.forename: Hiromi
authors.initials: H
authors.lastname: Kudo
authors.forename: Chanis
authors.initials: C
authors.lastname: Pornnumpa
authors.forename: Raghu Ram K
authors.initials: RR
authors.lastname: Nair
authors.forename: Padmavaty Amma
authors.initials: PA
authors.lastname: Jayalekshmi
authors.forename: Paul
authors.initials: P
authors.lastname: Sebastian
authors.forename: Suminori
authors.initials: S
authors.lastname: Akiba
mesh_terms: D000396:Air Pollutants, Radioactive / Q000032:analysis*; D016902:Air Pollution, Indoor / Q000032:analysis*; D001417:Background Radiation; D002274:Carcinogens, Environmental / Q000032:analysis*; D004781:Environmental Exposure / Q000032:analysis*; D006798:Housing; D006801:Humans; D007194:India; D011834:Radiation Monitoring / Q000379:methods*; D011886:Radon / Q000032:analysis*; D017687:Radon Daughters / Q000032:analysis*
chemical_list: D000396:Air Pollutants, Radioactive; D002274:Carcinogens, Environmental; D017687:Radon Daughters; D011886:Radon