Evaluation of Radioactive Contamination Caused by Each Plant of Fukushima Daiichi Nuclear Power Station Using 134Cs/137Cs Activity Ratio as an Index
Evaluation of Radioactive Contamination Caused by Each Plant of Fukushima Daiichi Nuclear Power Station Using 134Cs/137Cs Activity Ratio as an Index
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DOI：
10.2116/bunsekikagaku.62.475
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发表时间：
2013-06-01
期刊：
影响因子：
0.2
通讯作者：
Matsuo, Motoyuki
中科院分区：
文献类型：
--
作者：
Komori, Masashi;Shozugawa, Atsumi;Matsuo, Motoyuki
我们以铯 - 134/铯 - 137活度比为指标，估算了福岛第一核电站1号至3号反应堆机组的放射性污染程度。尽管据报道此次事故排放的铯 - 134/铯 - 137活度比约为1∶1，但由于每个核反应堆的该比值略有不同，环境样本中的活度比出现了差异。因此，该比值被认为可作为评估各反应堆机组污染的一个有用指标。我们在日本东部采集了土壤和植物碎片，测量了伽马射线，并计算了铯 - 134/铯 - 137活度比。我们还计算了各反应堆厂房（R/B）和汽轮机厂房（T/B）内积聚的污染水中的铯 - 134/铯 - 137活度比，并与环境样本的比值进行了比较。铯 - 134和铯 - 137活度浓度的数据由东京电力公司提供。结果表明，牡鹿半岛一个样本的比值约为0.91，低于其他样本，且与福岛第一核电站1号反应堆机组的比值相似。这表明牡鹿半岛主要受1号反应堆机组污染。我们还评估了其他地点各反应堆机组的放射性污染程度。
We estimated the extent of radioactive contamination from each reactor unit (1 to 3) of Fukushima Daiichi Nuclear Power Station by using the Cs-134/Cs-137 activity ratio as an index. Although the activity ratio of Cs-134/Cs-137 emitted by the accident has been reported to be about 1 : 1, variations in the activity ratio has arisen in environmental samples, since the ratio differs slightly for every nuclear reactor. Therefore, it is considered that the ratio is useful for a index for evaluating the contamination from each reactor unit. We collected soils and plant pieces in eastern Japan, measured gamma rays and calculated the Cs-134/Cs-137 activity ratio. We also calculated the Cs-134/Cs-137 activity ratio in contaminated water accumulated in each reactor building (R/B) and turbine building (T/B), and compared it with the ratio of environmental samples. The data of the Cs-134 and Cs-137 activity concentration are presented by Tokyo Electric Power Company. As a result, it turned out that the ratio of a sample in Oshika Peninsula was about 0.91, which was lower than that of other samples, and similar to the ratio of reactor unit 1 of Fukushima Daiichi Nuclear Power Station. It is suggested that Oshika Peninsula is contaminated mainly from reactor unit 1. We also evaluated the extent of activity contamination from each reactor unit at other points.