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Journal Articles

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

Limnology, 23(1), p.1 - 7, 2022/01

https://doi.org/10.1007/s10201-021-00674-y
 Times Cited Count：1 Percentile：7.45(Limnology)

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.

Journal Articles

Numerical study of transport pathways of $$^{137}$$Cs from forests to freshwater fish living in mountain streams in Fukushima, Japan

Kurikami, Hiroshi; Sakuma, Kazuyuki; Malins, A.; Sasaki, Yoshito; Niizato, Tadafumi

Journal of Environmental Radioactivity, 208-209, p.106005_1 - 106005_11, 2019/11

AA2018-0485.pdf:1.87MB

https://doi.org/10.1016/j.jenvrad.2019.106005
 Times Cited Count：17 Percentile：58.6(Environmental Sciences)

To assess the uptake of Cs-137 ($$^{137}$$Cs) by freshwater fish, we developed a compartment model for the migration of $$^{137}$$Cs on the catchment scale from forests to river water. We modelled a generic forest catchment with Fukushima-like parameters to ascertain the importance of export pathways of $$^{137}$$Cs from forests to river water for the uptake of $$^{137}$$Cs by freshwater fish. The results suggest that the decreasing trend of $$^{137}$$Cs in river water and freshwater fish was due to combination of the decreasing trend in the forest leaves/needles and litter compartments, and the increasing trend in soil. The $$^{137}$$Cs concentrations within these forest compartments plateau at around ten years after the fallout due to $$^{137}$$Cs circulation in forests reaching an equilibrium state.

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