The distributions of 134Cs, 137Cs and 90Sr in the northwest Pacific seawater in the winter of 2012

Deng, Fangfang; Lin, Feng; Yu, Wen; He, Jianhua; Wang, Fengfeng; Chen, Zhaohui

The distributions of 134Cs, 137Cs and 90Sr in the northwest Pacific seawater in the winter of 2012

2020

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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