title: Development of prediction models for radioactive caesium distribution within the 80-km radius of the Fukushima Daiichi nuclear power plant.
abstract: Preliminary prediction models have been studied for the radioactive caesium distribution within the 80-km radius of the Fukushima Daiichi nuclear power plant. The models were represented by exponential functions using ecological half-life of radioactive caesium in the environment. The ecological half-lives were derived from the changes in ambient dose equivalent rates through vehicle-borne surveys. It was found that the ecological half-lives of radioactive caesium were not constant within the 80-km radius of the Fukushima Daiichi nuclear power plant. The ecological half-life of radioactive caesium in forest areas was found to be much larger than that in urban and water areas.
authors.affiliation: Japan Atomic Energy Agency, 2-4 Shirakata-Shirane, Tokai-mura, Ibaraki 319-1195, Japan kinase.sakae@jaea.go.jp.
authors.forename: Sakae
authors.initials: S
authors.lastname: Kinase
authors.affiliation: Kyoto University, 2-1010 Asashiro-nishi, Kumatori-cho, Osaka 590-0494, Japan.
authors.forename: Tomoyuki
authors.initials: T
authors.lastname: Takahashi
authors.affiliation: Japan Atomic Energy Agency, 2-4 Shirakata-Shirane, Tokai-mura, Ibaraki 319-1195, Japan.
authors.forename: Satoshi
authors.initials: S
authors.lastname: Sato
authors.affiliation: Institute of Radiation Measurements, 2-4 Shirakata-Shirane, Tokai-mura, Ibaraki 319-1106, Japan.
authors.forename: Ryuichi
authors.initials: R
authors.lastname: Sakamoto
authors.affiliation: Japan Atomic Energy Agency, 2-4 Shirakata-Shirane, Tokai-mura, Ibaraki 319-1195, Japan.
authors.forename: Kimiaki
authors.initials: K
authors.lastname: Saito
mesh_terms: D000396:Air Pollutants, Radioactive / Q000032:analysis*; D002588:Cesium Radioisotopes / Q000032:analysis*; D062406:Fukushima Nuclear Accident; D006801:Humans; D008962:Models, Theoretical; D011829:Radiation Dosage; D011834:Radiation Monitoring
chemical_list: D000396:Air Pollutants, Radioactive; D002588:Cesium Radioisotopes