UNSCEAR 2020/2021 Report (4/8): Estimation of Public Exposure Doses for Each of the Four Groups

Public exposure radiation due to the accident differs by location, and evacuees changed their locations over time. Therefore, in the UNSCEAR 2020/2021 Report, areas were classified into four groups for assessing public exposure doses, and the targets were further narrowed down depending on the exposure pathways.

For ease of comparison with the UNSCEAR 2013 Report, the classification is basically the same. However, the neighboring prefectures in Group 3 were changed from six (Iwate, Miyagi, Ibaraki, Tochigi, Gunma, and Chiba Prefectures) for the UNSCEAR 2013 Report to four (Miyagi, Yamagata, Ibaraki, and Tochigi Prefectures). This is due to differences in the spatial coverage of the most recent radionuclide deposition density information used in the dose assessment.

[Relevant parts in the Report]

• UNSCEAR 2020/2021 Report (prepared based on Table 7 in paragraph 129 on pages 49 to 50, ANNEX B)

• Included in this reference material on March 31, 2023