Fukushima-derived radiocesium in the waters of the Northwest Pacific Ocean in the winter of 2011
2022
Wang, Fenfen | Men, Wu | Huang, Jiang | Yu, Tao | He, Jianhua | Yu, Wen | Li, Yiliang
To understand the transport of Fukushima Dai-ichi Nuclear Power Plant Accident (FDNPPA)-derived nuclear contaminated water, which will be discharged into the Pacific Ocean in the future, the distributions of ¹³⁴Cs and ¹³⁷Cs in seawater in the public areas east of Japan in winter 2011 were reported in this study. The ranges of ¹³⁴Cs and ¹³⁷Cs activities were <MDA (Minimum Detectable Activity) -68.9 Bq/m³ and 1.3–85.9 Bq/m³, respectively. The average decay corrected FDNPPA-derived ¹³⁴Cs/¹³⁷Cs activity ratio was 0.97. The FDNPPA-derived radiocesium existed in the seawater at a relatively high level at most stations. The ¹³⁴Cs and ¹³⁷Cs activities were comparable throughout the upper 50 m at each station. The FDNPPA-derived radiocesium was mainly distributed north of 36.5°N due to the boundary formed by the Kuroshio Extension. The temporal variations of FDNPPA-derived ¹³⁴Cs and ¹³⁷Cs suggested that their environmental half-lives in the study area were 61 d and 63 d in the period of June 2011 to June 2012, respectively.
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