An early survey of the radioactive contamination of soil due to the Fukushima Dai-ichi Nuclear Power Plant accident, with emphasis on plutonium analysis
An early survey of the radioactive contamination of soil due to the Fukushima Dai-ichi Nuclear Power Plant accident, with emphasis on plutonium analysis
复制标题
DOI：
10.2343/geochemj.2.0215
复制
发表时间：
2012-01-01
影响因子：
0.8
通讯作者：
Kimura, S.
中科院分区：
文献类型：
--
作者：
Yamamoto, M.;Takada, T.;Kimura, S.
福岛第一核电站事故发生后不久，就进行了实地考察。从20公里隔离区外的重污染地区以及核电站附近的大沼镇采集的一系列土壤样品中，测量了伽马射线释放的放射性核素和钚同位素。放射性核素I-131、Cs-134和Cs-137对释放的放射性有很大贡献。这些核素在西北部地区的沉积量较高--包括距离核电站25-45公里的大沼镇和利塔特村。所获得的结果与日本-美国联合调查(朝日新闻公司，2011年)后来估计的水平和分布是一致的。来自事故的痕量钚同位素主要在利特村的土壤样本和大沼镇的有限土壤样本中被检测到。事故中检测到的钚-239.240污染水平被认为不到Cs-137污染水平的百万分之一。
A field survey was carried out soon after the Fukushima Dai-ichi Nuclear Power Plant accident. Gamma-ray emitting radionuclides and plutonium isotopes in a series of soil samples collected from the heavily contaminated areas outside the 20-km exclusion zone, as well as from Okuma Town adjacent to the plant, were measured.Volatile radionuclides such as I-131, Cs-134, and Cs-137 contributed largely to the released radioactivity. Higher depositions of these nuclides were observed in areas to the northwestern-including Okuma Town and litate Village, which is at a distance of 25-45 km from the plant. The results obtained were consistent with the levels and distributions estimated later by the Japan-USA joint-survey (Asahi Shimbun Company, 2011). Trace amounts of plutonium isotopes originating from the accident were detected mainly in soil samples from litate Village and in limited soil samples from Okuma Town. The detected levels of Pu-239.240 contamination due to the accident were considered to be less than a millionth those of the Cs-137 contamination.