Distribution of local ¹³⁷Cs anomalies on the seafloor near the Fukushima Dai-ichi Nuclear Power Plant

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• 作者：Blair Thornton ; Seiki Ohnishi ; Tamaki Ura ; Naoteru Odano ; Shun Sasaki ; Tsuneo Fujita ; Tomowo Watanabe ; Kaoru Nakata ; Tsuneo Ono ; Daisuke Ambe
• 关键词：Fukushima Dai-ichi Nuclear Power Plant ; Radioactive cesium ; Marine sediment ; Terrain features ; Towed gamma ray spectrometer
• 刊名：Marine Pollution Bulletin
• 出版年：2013
• 出版时间：15 September, 2013
• 年：2013
• 卷：74
• 期：1
• 页码：344-350
• 全文大小：1990 K

文摘

An estimated 3.5 ¡À 0.7 ¡Á 10¹⁵ Bq of ¹³⁷Cs is thought to have been discharged into the ocean following the melt down at Fukushima Dai-ichi Nuclear Power Plant (F1NPP). While efforts have been made to monitor seafloor radiation levels, the sampling techniques used cannot capture the continuous distribution of radionuclides. In this work, we apply in situ measurement techniques using a towed gamma ray spectrometer to map the continuous distribution of ¹³⁷Cs on the seafloor within 20 km of the F1NPP. The results reveal the existence of local ¹³⁷Cs anomalies, with levels of ¹³⁷Cs an order of magnitude higher than the surrounding seafloors. The sizes of the anomalies mapped in this work range from a few meters to a few hundreds of meters in length, and it is demonstrated that the distribution of these anomalies is strongly influenced by meter scale features of the terrain.