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Geochemical Journal
Geochemical Journal An open access journal for geochemistry
Published for geochemistry community from Geochemical Society of Japan.

A record of 241Am, 236U, 238U, 239Pu, 240Pu, 134Cs and 137Cs in surface seawater and 241Am in aerosols shortly after the FDNPP incident occurred

Geochemical Journal, Vol. 55, No. , P. 33-38, 2021


We obtained the rare data on low activity concentration of 241Am in the surface seawater collected at about 210 km northeast of Fukushima Daiichi Nuclear Power Plant (FDNPP) on 29 April 2011. The concentration of 236U, 238U, 239Pu, 240Pu, 134Cs and 137Cs in that seawater was also determined and the atomic ratio 236U/238U and 240Pu/239Pu was calculated. The activity concentration of 137Cs compared to that before the incident and the equal activity ratio of 134Cs/137Cs clearly indicate that the seawater was contaminated by the radioactive Cs discharged from the FDNPP, while the activity concentration of 241Am as well as 236U, 239Pu and 240Pu was in the range of the values reported before the incident. 241Am in the aerosols collected at about 120 km from the FDNPP, in which FDNPP derived 236U and Pu isotopes were found, was analyzed. However, no significant larger amount compared to 236U and 239+240Pu was found.


241Am, actinides, surface seawater, aerosol, Fukushima

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