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TitleEvaluation of ambient dose equivalent rates influenced by vertical and horizontal distribution of radioactive cesium in soil in Fukushima Prefecture
Alternative title福島における土壌中放射性セシウムの鉛直・水平分布により影響される空間線量率の評価
PublisherElsevier
AuthorMalins, A.
AuthorKurikami, Hiroshi
AuthorNakama, Shigeo
AuthorSaito, Tatsuo
AuthorOkumura, Masahiko
AuthorMachida, Masahiko
AuthorKitamura, Akihiro
Issued date2016-01
Languageeng
Page38p.-49p.
Typereport
DescriptionThe air dose rate in an environment contaminated with 134Cs and 137Cs depends on the amount, depth profile and horizontal distribution of these contaminants within the ground. This paper introduces and verifies a tool that models these variables and calculates ambient dose equivalent rates at 1 m above the ground. Good correlation is found between predicted dose rates and dose rates measured with survey meters in Fukushima Prefecture in areas contaminated with radiocesium from the Fukushima Dai-ichi Nuclear Power Plant accident. Better predictions are obtained by modeling the horizontal distribution of radioactive cesium across an area if multiple soil samples are available, as opposed to assuming a spatially homogeneous contamination distribution. Reductions seen in air dose rates above flat, undisturbed fields in Fukushima Prefecture are consistent with decrement by radioactive decay and downward migration of cesium into soil. Analysis of remediation strategies for farmland soils confirmed that topsoil removal and interchanging a topsoil layer with a subsoil layer result in similar reductions in the air dose rate.
Information sourceJOPSSRelation URLRelation URL
URIhttps://f-archive.jaea.go.jp/dspace/handle/faa/211412