title: Absorbed dose rate in air in metropolitan Tokyo before the Fukushima Daiichi Nuclear Power Plant accident.
abstract: The monitoring of absorbed dose rate in air has been carried out continually at various locations in metropolitan Tokyo after the accident of the Fukushima Daiichi Nuclear Power Plant. While the data obtained before the accident are needed to more accurately assess the effects of radionuclide contamination from the accident, detailed data for metropolitan Tokyo obtained before the accident have not been reported. A car-borne survey of the absorbed dose rate in air in metropolitan Tokyo was carried out during August to September 2003. The average absorbed dose rate in air in metropolitan Tokyo was 49±6 nGy h(-1). The absorbed dose rate in air in western Tokyo was higher compared with that in central Tokyo. Here, if the absorbed dose rate indoors in Tokyo is equivalent to that outdoors, the annual effective dose would be calculated as 0.32 mSv y(-1).
authors.affiliation: Department of Radiological Sciences, Tokyo Metropolitan University, 7-2-10 Higashiogu, Arakawa-ku, Tokyo 116-8551, Japan.
authors.forename: K
authors.initials: K
authors.lastname: Inoue
authors.affiliation: Hirosaki University Graduate School of Health Sciences, 66-1 Hon-cho, Hirosaki, Aomori 036-8564, Japan m_hosoda@hirosaki-u.ac.jp.
authors.forename: M
authors.initials: M
authors.lastname: Hosoda
authors.affiliation: Department of Radiological Sciences, Tokyo Metropolitan University, 7-2-10 Higashiogu, Arakawa-ku, Tokyo 116-8551, Japan.
authors.forename: M
authors.initials: M
authors.lastname: Fukushi
authors.affiliation: Graduate School of Engineering and Science, University of the Ryukyus, 1 Senbaru, Nishihara, Okinawa 903-0213, Japan.
authors.forename: M
authors.initials: M
authors.lastname: Furukawa
authors.affiliation: Institute of Radiation Emergency Medicine, Hirosaki University, 66-1 Hon-cho, Hirosaki, Aomori 036-8564, Japan.
authors.forename: S
authors.initials: S
authors.lastname: Tokonami
mesh_terms: D065638:Absorption, Radiation; D000396:Air Pollutants, Radioactive / Q000032:analysis*; D062406:Fukushima Nuclear Accident; D011829:Radiation Dosage; D000069079:Radiation Exposure / Q000032:analysis*; D011834:Radiation Monitoring / Q000379:methods*; D011847:Radioactive Fallout / Q000032:analysis*; D014041:Tokyo
chemical_list: D000396:Air Pollutants, Radioactive; D011847:Radioactive Fallout