A Review of Studies on Thyroid Dose Estimation After the Fukushima Accident

Ishikawa, Tetsuo

doi:10.1016/b978-0-12-812768-1.00013-7

Cited by 1 publication

(2 citation statements)

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“…Thyroid doses and effective doses estimated by different methodologies are compared in table 1 (Ishikawa 2017b). Thyroid doses estimated by thyroid counting or WBC were generally lower than those estimated from environmental monitoring data.…”

Section: Ishikawa 2017amentioning

confidence: 99%

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Internal doses from radionuclides and their health effects following the Fukushima accident

Ishikawa

Matsumoto²,

Sato

et al. 2018

J. Radiol. Prot.

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This paper presents an overview of current internal dose estimates from the Fukushima accident, potential population specific uncertainties in these estimates are investigated, along with the relative effects of internal and external exposures. Thyroid doses were largely due to I, but variations in thyroid weight and fractional uptake and retention times ofI in the thyroid contribute to uncertainties in thyroid dose estimates. Lower values for these parameters in the Japanese population, as compared to international reference assumptions, would lead to underestimation of doses on the basis of reference thyroid weights and overestimation of doses using reference thyroid uptake and retention times. Any overall bias in thyroidal doses due to population specific factors is the net result of the balance between these effects. Internal doses to other organs are largely due to Cs andCs and their whole body distribution, population specific differences in these dose estimates are driven by average body mass, due to the inverse relationship between this and retention times. Potential differences in dose estimates and any inferred risks, due to local population specific factors, may be less than a factor of two for children and male adults, but the potential difference may be slightly underestimated for female adults. Recent micro-dosimetric studies have confirmed the existing perception that risk from internal exposures to Cs,Cs, and I should be nearly equivalent to that from external exposure to gamma rays at the same absorbed dose. Epidemiological studies provide comparisons between external and internal exposures toI in children and suggest that effects of internal exposure are similar to those of external exposure. Effective dose has been formulated to harmonise internal and external exposure risks for radiation protection purposes. On the basis of this review, the use of effective dose in this context does not seem to be unreasonable.

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Section: Ishikawa 2017amentioning

confidence: 99%

“…First, the UNSCEAR report states that doses may be overestimated due to the conservative assumptions used. Recent publications from Japan generally support this statement, as summarised in two reviews (Ishikawa 2017a(Ishikawa , 2017b. Second, the estimated doses are uncertain.…”

Section: Introductionmentioning

confidence: 99%