title: A GIS-based evaluation of the effect of decontamination on effective doses due to long-term external exposures in Fukushima.
abstract: Despite the enormous cost of radiation decontamination, there has been almost no quantitative discussion on how much it would reduce the long-term external radiation exposure in the Evacuation Zone and Planned Evacuation Zone (restricted zone) in Fukushima. The aim of this study is to assess the effectiveness of decontamination and return options and to identify important parameters for estimating the long-term cumulated effective dose (CED) during 15, 30 and 70 year period using data on land-use, population and decontamination in the restricted zone (about 1100 km(2)) in Fukushima. Decontamination of the land is assumed to have a certain efficacy in terms of the reduction of CED. The EeCC (external exposure conversion coefficient) is the parameter having the greatest effect on the percentage of area having CED during the 30 years above 100 m Sv after decontamination, ranging from 13% (EeCC=0.2) to 55% (EeCC=0.6). Therefore, we recommend a detailed investigation of the EeCC in Japan.
authors.affiliation: National Institute of Advanced Industrial Science and Technology, 1-1-1, Higashi, Tsukuba, Ibaraki 305-8567, Japan. Electronic address: t.yasutaka@aist.go.jp.
authors.forename: Tetsuo
authors.initials: T
authors.lastname: Yasutaka
authors.forename: Yumi
authors.initials: Y
authors.lastname: Iwasaki
authors.forename: Shizuka
authors.initials: S
authors.lastname: Hashimoto
authors.forename: Wataru
authors.initials: W
authors.lastname: Naito
authors.forename: Kyoko
authors.initials: K
authors.lastname: Ono
authors.forename: Atsuo
authors.initials: A
authors.lastname: Kishimoto
authors.forename: Kikuo
authors.initials: K
authors.lastname: Yoshida
authors.forename: Michio
authors.initials: M
authors.lastname: Murakami
authors.forename: Isao
authors.initials: I
authors.lastname: Kawaguchi
authors.forename: Toshihiro
authors.initials: T
authors.lastname: Oka
authors.forename: Junko
authors.initials: J
authors.lastname: Nakanishi
mesh_terms: D003666:Decontamination; D062406:Fukushima Nuclear Accident; D040362:Geographic Information Systems; D006801:Humans; D007564:Japan; D055848:Nuclear Power Plants; D011829:Radiation Dosage; D011834:Radiation Monitoring; D011848:Radioactive Pollutants / Q000032:analysis*
chemical_list: D011848:Radioactive Pollutants
keywords: Evaluation zone; External exposure conversion coefficient; Fukushima-Daiichi nuclear Power Plant; Occupancy factor; Radio-cesium contamination