Assessment of individual external exposure doses based on environmental radiation in areas affected by the Fukushima Daiichi Nuclear Power Station accident

Sato, Rina; Yoshimura, Kazuya; Sanada, Yukihisa; Mikami, Satoshi; Yamada, Tsutomu*; Nakasone, Takamasa*; Kanaizuka, Seiichi*; Sato, Tetsuro*; Mori, Tsubasa*; Takagi, Marie*

Environment International, 194, p.109148_1 - 109148_8, 2024/12

https://doi.org/10.1016/j.envint.2024.109148

Assessment of individual external doses from ambient dose equivalents is used for predictive and retrospective assessments where personal dosimeters are not applicable. However, it tends to contain more errors than assessment by personal dosimetry due to various parameters. Therefore, in order to accurately assess the individual dose from ambient dose equivalents, a model that estimates effective doses considering life patterns and the shielding effects by buildings and vehicles, were developed in this study. The model parameters were examined using robust datasets of environmental radiation measured in the areas affected by the Fukushima Daiichi Nuclear Power Station accident in 2020 to 2021. The accuracy of the model was validated by comparison with 106 daily personal doses measured in Fukushima Prefecture in 2020. The measured personal dose was well reproduced by the model-estimated effective dose, showing that the model can be used to assess the individual exposure dose, similar to personal dosimetry. Furthermore, this model is an effective tool for radiation protection, as it can estimate the individual dose predictively and retrospectively by using environmental radiation data.

A Knowledge-sharing activity on the environmental radiation monitoring results affected by the Fukushima-Daiichi Nuclear Power Plant Accident at Tokai-Oarai area in Ibaraki Prefecture

Nakano, Masanao; Hosomi, Kenji; Nishimura, Shusaku; Matsubara, Natsumi; Okura, Takehisa; Kuramochi, Akihiko; Kawasaki, Masatsugu; Takeuchi, Erina; Fujii, Yutaka*; Jinno, Tsukasa*; et al.

Hoken Butsuri (Internet), 55(2), p.102 - 109, 2020/06

https://doi.org/10.5453/jhps.55.102

After the Fukushima-Daiichi Nuclear Power Station (1F) Accident in March 2011, the increase was significantly observed in a part of the result of the environmental radiation monitoring in Ibaraki prefecture. "The review meeting of the environmental effect from 1F accident" was established to discuss technically the fluctuation of monitoring data. The review meeting collected the monitoring data from the four nuclear operators, and discussed a fluctuating trend, Cs/Cs activity ratio, and so on. In this report, the results of the dose rate and Cs in fallout, surface soil, flatfish and seabed sediment are introduced. Also the problem solving in the review meeting is introduced.

Modelling the effect of mechanical remediation on dose rates above radiocesium contaminated land

Malins, A.; Kurikami, Hiroshi; Kitamura, Akihiro; Machida, Masahiko

Remediation Measures for Radioactively Contaminated Areas, p.259 - 272, 2019/00

https://doi.org/10.1007/978-3-319-73398-2_12

Challenges for enhancing Fukushima environmental resilience, 1; Status and lessons

Miyahara, Kaname; Ohara, Toshimasa*

Nihon Genshiryoku Gakkai-Shi ATOMO, 59(5), p.282 - 286, 2017/05

This review highlights JAEA and NIES's challenges for enhancing Fukushima environmental resilience based on carrying out multifaceted research working with many public and private sector organizations and academia.

Measurements and evaluations of air dose rates around Fukushima, 3; Characteristics of environmental rays and the exposure doses

Saito, Kimiaki; Endo, Akira

Radioisotopes, 63(12), p.585 - 602, 2014/12

https://doi.org/10.3769/radioisotopes.63.585

The article provides the fundamental information necessary for the appropriate evaluation of exposure doses in the environment. The basic characteristics of environmental rays from typical environmental sources are introduced; then, the dose conversion coeffcients for the public at different ages are summarized which were obtained from the simulation considering the basic characteristics of environmental rays. Further, the variations of environmental exposure doses due to a variety of factors, and the relation of exposure doses to measured air dose rates are discussed.

Radiation safety in fusion facilities, 4; Dose assessment for radioactive materials released into the environment, 4.2, Environmental tritium bahavior and dose assessment

Noguchi, Hiroshi

Purazuma, Kaku Yugo Gakkai-Shi, 74(7), p.712 - 715, 1998/07

http://ci.nii.ac.jp/naid/110003826259

no abstracts in English

Dose delivered by unit amount of tritium released into the environment

Murata, Mikio; Noguchi, Hiroshi

Journal of Nuclear Science and Technology, 34(2), p.176 - 184, 1997/02

https://doi.org/10.3327/jnst.34.176

no abstracts in English

Determination of Spectrum-Dose Conversion Operator for a Pure Germainium Semi-Conductor Detector for Environmental -ray Measurement

; ;

JAERI-M 84-003, 30 Pages, 1984/02

JAERI-M-84-003.pdf:1.19MB

no abstracts in English

New technical approach to monitoring of low-level environmental gamma radiation using NaI (Tl) scintillation instrument

; ;

Journal of Nuclear Science and Technology, 17(9), p.710 - 720, 1980/00

https://doi.org/10.3327/jnst.17.710

no abstracts in English

Survey of Distributions of Population and Agricultural Production and Other Information to Apply for Assessment of Population Doses; Survey Programs of Information Neccssary for Reserch of Environmental Safety

JAERI-M 7757, 97 Pages, 1978/07

JAERI-M-7757.pdf:3.52MB

no abstracts in English

PHITS models for ambient dose equivalent rates in Fukushima's Radiocesium contaminated forests

Malins, A.; Imamura, Naohiro*; Niizato, Tadafumi; Kim, M.; Sakuma, Kazuyuki; Shinomiya, Yoshiki*; Miura, Satoru*; Machida, Masahiko

no journal, ,