Lateral variation of ¹³⁴Cs and ¹³⁷Cs concentrations in surface seawater in and around the Japan Sea after the Fukushima Dai-ichi Nuclear Power Plant accident

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• 作者：M. Inoue^a ; ^{mutsuo@llrl.ku-unet.ocn.ne.jp} ; H. Kofuji^b ; S. Nagao^a ; M. Yamamoto^a ; Y. Hamajima^a ; K. Yoshida^a ; K. Fujimoto^c ; T. Takada^a ; Y. Isoda^d
• 关键词：134Cs ; 137Cs ; Surface seawater ; Fukushima Dai-ichi Nuclear Power Plant accident ; Japan Sea
• 刊名：Journal of Environmental Radioactivity
• 出版年：2012
• 期刊代码：45_0265931x
• 类别：env
• 出版时间：July, 2012
• 卷：109
• 期：Complete
• 页码：45-51
• 文件大小：520 K

摘要

A total of 82 surface seawater samples was collected in the Japan Sea and the southwestern Okhotsk Sea before and after the Fukushima Dai-ichi Nuclear Power Plant (FDNPP) accident. Analysis of ¹³⁴Cs and ¹³⁷Cs concentrations using low-background 纬-spectrometry revealed that the ¹³⁷Cs concentration of the samples collected in June 2011 was 1.5-2.8 mBq/L, which is approximately 1-2 times higher than the pre-accident ¹³⁷Cs level, while the ¹³⁴Cs concentration was less than detectable to 1 mBq/L. In addition to ¹³⁴Cs being clearly detected (鈭? mBq/L), ¹³⁷Cs concentration in water samples from the northeastern Japan Sea (2-2.8 mBq/L) was also higher than that from the coast in the southwestern Japan Sea (鈭?.5 mBq/L). These higher concentrations in the northeastern Japan Sea could be ascribed to the atmospheric transport of nuclides from the FDNPP as aerosols and subsequent transport and dilution after delivery to the sea surface.