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BOOKLET to Provide Basic Information Regarding Health Effects of Radiation (3rd edition)
Chapter 5 Assessments by International Organizations 5.1 WHO Reports and UNSCEAR 2013 Report

WHO Reports and UNSCEAR 2013 Report (2/3)
Comparison of Assessments (2/2): Assessment of Public Exposure Doses and Major Uncertainties

WHO Reports and UNSCEAR 2013 Report (2/3) Comparison of Assessments (2/2): Assessment of Public Exposure Doses and Major Uncertainties_Figure

For effective dose estimation, the WHO divided Japan into three zones, (i) Fukushima Prefecture, (ii) neighboring prefectures (Chiba, Gunma, Ibaraki, Miyagi and Tochigi Prefectures), and (iii) the rest of Japan, while the UNSCEAR divided Fukushima Prefecture into three zones, and the other prefectures into (iv) neighboring prefectures (Miyagi, Gunma, Tochigi, Ibaraki, Chiba and Iwate Prefectures) and (v) the rest of Japan.

Both the WHO Reports and the UNSCEAR Report state that their assessments of internal and external exposure doses contain certain uncertainties due to uncertainties inherent to basic data. Sources of such uncertainties explained in these Reports are mostly the same despite some differences in expressions. The assessment by the WHO is generally overestimated than that by the UNSCEAR.

(Related to p.191 of Vol. 1, "WHO Reports (2/4) Effective Dose Estimation Method," p.193 of Vol. 1, "WHO Reports (4/4) Evaluation of Uncertainties," p.197 of Vol. 1, "UNSCEAR 2013 Report (4/9) Estimation of Public Exposure Doses for Each of the Four Groups," p.199 of Vol. 1, "UNSCEAR 2013 Report (6/9) Assessment of Public Exposure Doses: Results," and p.201 of Vol. 1, "UNSCEAR 2013 Report (8/9) Assessment of Public Exposure Doses: Uncertainties")

 

[Relevant parts in the reports]

Results of effective dose estimation:

  • WHO Report on preliminary dose estimation (prepared based on pages 40 to 45 (3. Results))
  • UNSCEAR Report (prepared based on paragraphs 209 to 214 on pages 56 to 57, Annex A (Japanese-language version)) (Original English version: paragraphs 209 to 214 on pages 86 to 87)
    Uncertainties in dose assessments:
  • WHO Report on preliminary dose estimation (prepared based on sections 4.7.1 to 4.7.7 of 4.7 on pages 60 to 62)
  • UNSCEAR Report (prepared based on paragraphs 110 to 115 on pages 35 to 36, Annex A (Japanese-language version)) (Original English version: paragraphs 110 to 115 on pages 60 to 61)
  • Included in this reference material on March 31, 2015
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