Spatial variations of low levels of ¹³⁴Cs and ¹³⁷Cs in seawaters within the Sea of Japan after the Fukushima Dai-ichi Nuclear Power Plant accident

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• 作者：Mutsuo Inoue ; Hisaki Kofuji ; Shinji Oikawa ; Takuma Murakami ; Masayoshi Yamamoto ; Seiya Nagao ; Yasunori Hamajima ; Jun Misonoo
• 关键词：Radiocesium ; Fukushima Dai-ichi Nuclear Power Plant accident ; Deposition ; Water circulation ; Riverine discharge
• 刊名：Applied Radiation and Isotopes
• 出版年：2013
• 出版时间：November, 2013
• 年：2013
• 卷：81
• 期：Complete
• 页码：340-343
• 全文大小：649 K

文摘

Our method based on low background ¦Ã-spectrometry enabled the measurement of low radiocesium concentrations in only 20 L of seawater. In May 2011 after deposition of radiocesium, ¹³⁴Cs concentration in surface water within the Sea of Japan was confirmed to be significantly small (<0.1-1 mBq/L) by the method. The concentration was not detected (<0.1 mBq/L) below 50 m depth. The Fukushima-derived radiocesium migrated from the surface water of the Sea of Japan without advection to below the thermocline.