Journal
SCIENTIFIC REPORTS
Volume 3, Issue -, Pages -Publisher
NATURE PUBLISHING GROUP
DOI: 10.1038/srep02283
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Funding
- Ministry of Education, Culture, Sports, Science and Technology, Japan
- Grants-in-Aid for Scientific Research [25740026] Funding Source: KAKEN
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Radionuclide concentrations in environmental samples such as surface soils, plants and water were evaluated by high purity germanium detector measurements. The contribution rate of short half-life radionuclides such as I-132 to the exposure dose to residents was discussed from the measured values. The highest values of the I-131/Cs-137 activity ratio ranged from 49 to 70 in the environmental samples collected at Iwaki City which is located to the south of the F1-NPS. On the other hand, the I-132/I-131 activity ratio in the same environmental samples had the lowest values, ranging from 0.01 to 0.02. By assuming that the I-132/I-131 activity ratio in the atmosphere was equal to the ratio in the environmental samples, the percent contribution to the thyroid equivalent dose by I-132 was estimated to be less than 2%. Moreover, the contribution to the thyroid exposure by I-132 might be negligible if I-132 contamination was restricted to Iwaki City.
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