Long-Term Analysis of Internal Exposure Dose-Reduction Effects by Food Regulation and Food Item Contribution to Dose after the Fukushima Daiichi Nuclear Power Plant Accident

Over 10 years have passed since the Fukushima Daiichi Nuclear Power Plant accident. This study verifies the efficacy of longitudinal regulation on internal exposure doses and analyzes food group contributions to radiation doses using accumulated monitoring test results. The committed effective doses...

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Bibliographic Details
Published in:Foods 2023-03, Vol.12 (6), p.1305
Main Authors: Osanai, Minoru, Miura, Mayu, Tanaka, Chihiro, Kudo, Kohsei, Hosokawa, Shota, Tsushima, Megumi, Noro, Tomuhiro, Iwaoka, Kazuki, Hosoda, Masahiro, Yamaguchi, Ichiro, Saito, Yoko
Format: Article
Language:English
Subjects:
Cesium
Classification
Drinking water
Environmental aspects
Exposure
Food contamination
Food intake
food regulation
Food safety
Food science
Fruits
Health aspects
Ingestion
internal exposure dose
Mathematical analysis
Nuclear accidents
Nuclear accidents & safety
Nuclear power plants
Nuclear safety
Nutrition
Oils & fats
Radiation
Radiation dosage
Radioactive materials
Radioactivity
risk assessment
standard limits
Vegetables
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Summary:Over 10 years have passed since the Fukushima Daiichi Nuclear Power Plant accident. This study verifies the efficacy of longitudinal regulation on internal exposure doses and analyzes food group contributions to radiation doses using accumulated monitoring test results. The committed effective doses in 10,000 virtual persons from fiscal year (FY) 2012 to 2021, with and without regulation, were estimated as products of radioactivity concentrations randomly sampled from the test results, food intake, and dose coefficient. The distributed values of food intake rather than a mean value in dose estimation were assumed to reflect food intake variations and avoid underestimation of internal exposure doses for high-intake consumers. Furthermore, the ingestion of radioactive cesium from the calculation was analyzed per food group. The 95th percentile of the internal exposure dose (the dose of a "representative person") was less than 1 mSv/year in both FYs. The regulation effect was substantial in FY 2012, and no noticeable difference in radiation doses was found between the regulation and no regulation conditions after FY 2016. Internal exposure doses decreased until approximately FY 2016 and then remained constant. It was also shown that not only radioactivity concentration but also food intake is a major factor affecting cesium intake. In summary, it was confirmed that Japan had ensured food safety regarding radioactive materials.
ISSN:2304-8158
2304-8158
DOI:10.3390/foods12061305