Abstract
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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