Comparison of Reports (Assessment Results)

The estimated effective doses to the public for the first year after the accident in Reports of the UNSCEAR and the WHO are as shown in the table above. The ranges of doses here show those of average values for prefectures, municipalities in the targeted areas, or evacuation scenarios for targeted groups.

The results of dose assessment in the UNSCEAR 2020/2021 Report are lower or at the same level compared with those presented in the UNSCEAR 2013 Report (p.194 of Vol. 1, “UNSCEAR 2020/2021 Report (3/8) Update from the UNSCEAR 2013 Report upon Assessing Public Exposure Doses”). The UNSCEAR 2020/2021 Report also assesses the uncertainties in dose assessment.

The WHO Reports and the UNSCEAR 2013 Report state that their assessments of exposure doses contain certain uncertainties due to uncertainties inherent to basic data. However, in the UNSCEAR 2020/2021 Report, dose estimation with less uncertainties became possible as a broader range of knowledge was made available.

[Relevant parts in the Reports]

• WHO's Preliminary dose assessment (prepared based on pages 40 to 45 (3. Results))
• UNSCEAR 2013 Report (prepared based on paragraphs 209 to 214 on pages 86 to 87, Annex A)
• UNSCEAR 2020/2021 Report (prepared based on paragraphs 166 to 169 on pages 64 to 66, ANNEX B)

• Included in this reference material on March 31, 2023