title: The time variation of dose rate artificially increased by the Fukushima nuclear crisis.
abstract: A car-borne survey for dose rate in air was carried out in March and April 2011 along an expressway passing northwest of the Fukushima Dai-ichi Nuclear Power Station which released radionuclides starting after the Great East Japan Earthquake on March 11, 2011, and in an area closer to the Fukushima NPS which is known to have been strongly affected. Dose rates along the expressway, i.e. relatively far from the power station were higher after than before March 11, in some places by several orders of magnitude, implying that there were some additional releases from Fukushima NPS. The maximum dose rate in air within the high level contamination area was 36 μGy h⁻¹, and the estimated maximum cumulative external dose for evacuees who came from Namie Town to evacuation sites (e.g. Fukushima, Koriyama and Nihonmatsu Cities) was 68 mSv. The evacuation is justified from the viewpoint of radiation protection.
authors.affiliation: Hirosaki University, Graduate School of Health Sciences, 66-1 Hon-cho, Hirosaki, Aomori 036-8564, Japan.
authors.forename: Masahiro
authors.initials: M
authors.lastname: Hosoda
authors.forename: Shinji
authors.initials: S
authors.lastname: Tokonami
authors.forename: Atsuyuki
authors.initials: A
authors.lastname: Sorimachi
authors.forename: Satoru
authors.initials: S
authors.lastname: Monzen
authors.forename: Minoru
authors.initials: M
authors.lastname: Osanai
authors.forename: Masatoshi
authors.initials: M
authors.lastname: Yamada
authors.forename: Ikuo
authors.initials: I
authors.lastname: Kashiwakura
authors.forename: Suminori
authors.initials: S
authors.lastname: Akiba
mesh_terms: D000396:Air Pollutants, Radioactive / Q000032:analysis*; D062406:Fukushima Nuclear Accident; D007564:Japan; D011829:Radiation Dosage
chemical_list: D000396:Air Pollutants, Radioactive