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Kensuke Otsuka
Low Dose Radiat. Res. Center, Cetrl. Res. Inst. Electric Power Industry
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Hiroshi Tauchi
Department of Environmental Sciences, Faculty of Sciece, Ibaraki University
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Kazuo Sakai
Research Center for Radiation Protection, National Institute of Radiological Sciences
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Takao Koana
Low Dose Radiat. Res. Center, Cetrl. Res. Inst. Electric Power Industry