Assessment of individual radionuclide distributions from the Fukushima nuclear accident covering central-east Japan
Assessment of individual radionuclide distributions from the Fukushima nuclear accident covering central-east Japan
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DOI：
10.1073/pnas.1111724108
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发表时间：
2011-12-06
影响因子：
11.1
通讯作者：
Yamagata, Takeyasu
中科院分区：
文献类型：
--
作者：
Kinoshita, Norikazu;Sueki, Keisuke;Yamagata, Takeyasu
2011年3月，福岛第一核电站的核反应堆冷却系统受损，大量放射性物质被排放。福岛及其邻近的县都受到了事故裂变产物的污染。在这里，我们显示了地理分布的放射性碘，碲，铯在日本中东部的表层土壤中的伽马射线光谱测定。特别是在福岛县，我们测量到的所有放射性核素的污染区域都分布在饭立和中通周围。放射性核素的分布受每种核素的物理状态以及地理特征的影响。考虑到气象条件，得出的结论是，3月15日运输的放射性物质是福岛县污染的主要贡献者，而3月21日运输的放射性物质是茨木县、栃木县、琦玉县、千叶县和东京的主要来源。
A tremendous amount of radioactivity was discharged because of the damage to cooling systems of nuclear reactors in the Fukushima No. 1 nuclear power plant in March 2011. Fukushima and its adjacent prefectures were contaminated with fission products from the accident. Here, we show a geographical distribution of radioactive iodine, tellurium, and cesium in the surface soils of central-east Japan as determined by gamma-ray spectrometry. Especially in Fukushima prefecture, contaminated area spreads around Iitate and Naka-Dori for all the radionuclides we measured. Distributions of the radionuclides were affected by the physical state of each nuclide as well as geographical features. Considering meteorological conditions, it is concluded that the radioactive material transported on March 15 was the major contributor to contamination in Fukushima prefecture, whereas the radioactive material transported on March 21 was the major source in Ibaraki, Tochigi, Saitama, and Chiba prefectures and in Tokyo.