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Report No.

Radiocesium transfer into freshwater planktonic ${it Chlamydomonas}$ spp. microalgae in a pond near the Fukushima Dai-ichi Nuclear Power Plant

Sasaki, Yoshito ; Funaki, Hironori ; Fujiwara, Kenso 

We investigated the transfer behavior of radiocesium in living cells and remains of a bloom of microalgae (${it Chlamydomonas}$ sp.) in a pond located about 5 km from the Fukushima Dai-ichi Nuclear Power Plant. As a positive correlation was detected between the cell number of microalgae and the radiocesium concentration (Bq/L) in the $$>$$ 0.45-$$mu$$m fraction, microalgae were the controlling factor for the radiocesium concentration of the $$>$$ 0.45-$$mu$$m fraction. The transfer factor of water-to-algae [($$^{137}$$Cs concentration Bq/kg $$>$$ 0.45-$$mu$$m fraction) $$times$$ ($$^{137}$$Cs concentration Bq/L water)$$^{-1}$$] was 1.6 $$times$$ 10$$^{3}$$. The radiocesium concentration of microalgae remains was the same as that in intact cells.



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