期刊
JOURNAL OF ENVIRONMENTAL RADIOACTIVITY
卷 111, 期 -, 页码 18-27出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.jenvrad.2011.11.006
关键词
Fukushima Dai-ichi nuclear power plant; Nuclear accident; Radioactivity; Dose rate; Cumulative dose
资金
- Grants-in-Aid for Scientific Research [21249041, 21404005] Funding Source: KAKEN
Soil sampling was carried out at an early stage of the Fukushima Dai-ichi Nuclear Power Plant (FDNPP) accident. Samples were taken from areas around FDNPP, at four locations northwest of FDNPP, at four schools and in four cities, including Fukushima City. Radioactive contaminants in soil samples were identified and measured by using a Ge detector and included Te-129m, Te-129, I-131, Te-132, I-132, Cs-134, Cs-136, (CS)-C-137, Ba-14 and La-140. The highest soil depositions were measured to the northwest of FDNPP. From this soil deposition data, variations in dose rates over time and the cumulative external doses at the locations for 3 months and 1 y after deposition were estimated. At locations northwest of FDNPP, the external dose rate at 3 months after deposition was 4.8-98 mu Sv/h and the cumulative dose for 1 y was 51 to 1.0 x 10(3) mSv; the highest values were at Futaba Yamada. At the four schools, which were used as evacuation shelters, and in the four urban cities, the external dose rate at 3 months after deposition ranged from 0.03 to 3.8 mu Sv/h and the cumulative doses for 1 y ranged from 3 to 40 mSv. The cumulative dose at Fukushima Niihama Park was estimated as the highest in the four cities. The estimated external dose rates and cumulative doses show that careful countermeasures and remediation will be needed as a result of the accident, and detailed measurements of radionuclide deposition densities in soil will be important input data to conduct these activities. (C) 2011 Elsevier Ltd. All rights reserved.
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