Emission of spherical cesium-bearing particles from an early stage of the Fukushima nuclear accident.
Emission of spherical cesium-bearing particles from an early stage of the Fukushima nuclear accident.
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DOI：
10.1038/srep02554
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发表时间：
2013
影响因子：
4.6
通讯作者：
Igarashi, Yasuhito
中科院分区：
文献类型：
--
作者：
Adachi, Kouji;Kajino, Mizuo;Zaizen, Yuji;Igarashi, Yasuhito
2011年3月的福岛核事故将放射性物质释放到整个北方的环境中，日本政府正在花费大量资金清理受污染的居民区和农田。然而，我们仍然不知道放射性物质的确切物理和化学性质。这项研究直接观察到球形铯轴承粒子在事故的相对早期阶段（3月14日至15日）排放。与目前假设的含铯放射性物质相比，这些粒子更大，含有Fe，Zn和Cs，并且不溶于水。我们的模拟结果表明，球形铯轴承颗粒主要落在地面上的干沉积。球形铯粒子的发现将是理解事故过程、准确评估健康影响和环境中停留时间的关键。
The Fukushima nuclear accident released radioactive materials into the environment over the entire Northern Hemisphere in March 2011, and the Japanese government is spending large amounts of money to clean up the contaminated residential areas and agricultural fields. However, we still do not know the exact physical and chemical properties of the radioactive materials. This study directly observed spherical Cs-bearing particles emitted during a relatively early stage (March 14–15) of the accident. In contrast to the Cs-bearing radioactive materials that are currently assumed, these particles are larger, contain Fe, Zn, and Cs, and are water insoluble. Our simulation indicates that the spherical Cs-bearing particles mainly fell onto the ground by dry deposition. The finding of the spherical Cs particles will be a key to understand the processes of the accident and to accurately evaluate the health impacts and the residence time in the environment.
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