title: Activity concentrations of environmental samples collected in Fukushima Prefecture immediately after the Fukushima nuclear accident.
abstract: Radionuclide concentrations in environmental samples such as surface soils, plants and water were evaluated by high purity germanium detector measurements. The contribution rate of short half-life radionuclides such as (132)I to the exposure dose to residents was discussed from the measured values. The highest values of the (131)I/(137)Cs activity ratio ranged from 49 to 70 in the environmental samples collected at Iwaki City which is located to the south of the F1-NPS. On the other hand, the (132)I/(131)I activity ratio in the same environmental samples had the lowest values, ranging from 0.01 to 0.02. By assuming that the (132)I/(131)I activity ratio in the atmosphere was equal to the ratio in the environmental samples, the percent contribution to the thyroid equivalent dose by (132)I was estimated to be less than 2%. Moreover, the contribution to the thyroid exposure by (132)I might be negligible if (132)I contamination was restricted to Iwaki City.
authors.affiliation: Department of Radiological Life Sciences, 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: Hirofumi
authors.initials: H
authors.lastname: Tazoe
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: Naofumi
authors.initials: N
authors.lastname: Akata
authors.forename: Hideki
authors.initials: H
authors.lastname: Kakiuchi
authors.forename: Yasutaka
authors.initials: Y
authors.lastname: Omori
authors.forename: Tetsuo
authors.initials: T
authors.lastname: Ishikawa
authors.forename: Sarata K
authors.initials: SK
authors.lastname: Sahoo
authors.forename: Tibor
authors.initials: T
authors.lastname: Kovács
authors.forename: Masatoshi
authors.initials: M
authors.lastname: Yamada
authors.forename: Akifumi
authors.initials: A
authors.lastname: Nakata
authors.forename: Mitsuaki
authors.initials: M
authors.lastname: Yoshida
authors.forename: Hironori
authors.initials: H
authors.lastname: Yoshino
authors.forename: Yasushi
authors.initials: Y
authors.lastname: Mariya
authors.forename: Ikuo
authors.initials: I
authors.lastname: Kashiwakura
mesh_terms: D000396:Air Pollutants, Radioactive / Q000032:analysis / Q000737:chemistry; D004784:Environmental Monitoring; D062406:Fukushima Nuclear Accident; D006207:Half-Life; D006801:Humans; D007457:Iodine Radioisotopes / Q000032:analysis / Q000737:chemistry; D007564:Japan; D011834:Radiation Monitoring; D011868:Radioisotopes / Q000032:analysis / Q000737:chemistry; D012990:Soil Pollutants, Radioactive; D014875:Water Pollutants, Radioactive
chemical_list: D000396:Air Pollutants, Radioactive; D007457:Iodine Radioisotopes; D011868:Radioisotopes; D012990:Soil Pollutants, Radioactive; D014875:Water Pollutants, Radioactive