title: Internal thyroid doses to Fukushima residents-estimation and issues remaining.
abstract: Enormous quantities of radionuclides were released into the environment following the disastrous accident at the Fukushima Daiichi Nuclear Power Plant (FDNPP) in March 2011. It is of great importance to determine the exposure doses received by the populations living in the radiologically affected areas; however, there has been significant difficulty in estimating the internal thyroid dose received through the intake of short-lived radionuclides (mainly, (131)I), because of the lack of early measurements on people. An estimation by the National Institute of Radiological Sciences for 1 April 2012 to 31 March 2013 was thus performed using a combination of the following three sources: thyroid measurement data ((131)I) for 1080 children examined in the screening campaign, whole-body counter measurement data ((134)Cs, (137)Cs) for 3000 adults, and atmospheric transport dispersion model simulations. In this study, the residents of Futaba town, Iitate village and Iwaki city were shown to have the highest thyroid equivalent dose, and their doses were estimated to be mostly below 30 mSv. However, this result involved a lot of uncertainties and provided only representative values for the residents. The present paper outlines a more recent dose estimation and preliminary analyses of personal behavior data used in the new method.
authors.affiliation: Research Center for Radiation Emergency Medicine, National Institute of Radiological Sciences, 4-9-1 Anagawa Inage-ku, Chiba city, Chiba 263-8555, Japan.
authors.forename: Eunjoo
authors.initials: E
authors.lastname: Kim
authors.affiliation: Research Center for Radiation Emergency Medicine, National Institute of Radiological Sciences, 4-9-1 Anagawa Inage-ku, Chiba city, Chiba 263-8555, Japan osakuri@nirs.go.jp.
authors.forename: Osamu
authors.initials: O
authors.lastname: Kurihara
authors.affiliation: REMAT, National Institute of Radiological Sciences, 4-9-1 Anagawa Inage-ku, Chiba city, Chiba 263-8555, Japan.
authors.forename: Naoaki
authors.initials: N
authors.lastname: Kunishima
authors.affiliation: Nuclear Fuel Cycle Engineering Laboratories, Japan Atomic Energy Agency, 4-33 Muramatsu Tokai-mura, Naka-gun, Ibaraki 319-1112, Japan.
authors.forename: Takumaro
authors.initials: T
authors.lastname: Momose
authors.affiliation: Fukushima Medical University, 1-Hikariga-oka Fukushima city, Fukushima 960-1295, Japan.
authors.forename: Tetsuo
authors.initials: T
authors.lastname: Ishikawa
authors.affiliation: REMAT, National Institute of Radiological Sciences, 4-9-1 Anagawa Inage-ku, Chiba city, Chiba 263-8555, Japan.
authors.forename: Makoto
authors.initials: M
authors.lastname: Akashi
mesh_terms: D000328:Adult; D002138:Calibration; D002588:Cesium Radioisotopes; D004307:Dose-Response Relationship, Radiation; D062406:Fukushima Nuclear Accident; D006801:Humans; D007223:Infant; D007564:Japan; D011834:Radiation Monitoring; D013961:Thyroid Gland / Q000528:radiation effects*; D014915:Whole-Body Counting
chemical_list: D002588:Cesium Radioisotopes
keywords: Fukushima Daiichi Nuclear Power Plant; accident; behavior data; internal exposure; radioiodine; thyroid dose