The distributions of 134Cs, 137Cs and 90Sr in the northwest Pacific seawater in the winter of 2012
2020
Deng, Fangfang | Lin, Feng | Yu, Wen | He, Jianhua | Wang, Fengfeng | Chen, Zhaohui
To understand the status of the radionuclides released during the Fukushima Dai-ichi Nuclear Power Plant accident, the ¹³⁴Cs, ¹³⁷Cs and ⁹⁰Sr in the seawater in the public area of the northwest Pacific Ocean were analyzed in November–December 2012. The radioactivity of ¹³⁴Cs, ¹³⁷Cs and ⁹⁰Sr decreased sharply from June 2011 to November–December 2012. The highest average values of ¹³⁴Cs and ¹³⁷Cs were found at a depth of 500 m, suggesting that ¹³⁴Cs and ¹³⁷Cs had been transported to a depth of 500 m or deeper by the end of 2012. Total inventories of 0.80 ± 0.20 pBq for ¹³⁷Cs from the surface to a depth of 500 m and 0.07 ± 0.02 pBq for ⁹⁰Sr from the surface to a depth of 100 m were obtained in the waters southeast of Fukushima. ¹³⁴Cs was detectable in the Chinese exclusive economic zone, and the seawater quality was much lower than the target level for China.
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