Following the failure of the nuclear power plant in Fukushima Prefecture in March 2011, peer-reviewed publications describing radioactivity levels in organisms inhabiting coastal environments are scarce. This paper reports on elevated levels of Cs-134 and Cs-137 in macroalgae and mussels (up to similar to 800 Bq kg(-1) dry wt.) in June 2011. Cs concentrations in biota sampled in early June 2011 were higher in areas south of Fukushima than sampled in the last third of the month north of Fukushima. Activity concentrations from Cs134+137 in organisms south of Fukushima were comparable to or lower than those from the naturally occurring K-40 in the same samples. While Pb-210 and Po-210 concentrations were generally lower than these other radionuclides, Po-210 as an alpha-emitter is more significant from a radiological viewpoint than gamma-emitters as it can inflict greater biological damage. By applying known bioconcentration factors of Cs in biota, measured biota concentrations of Cs were also used to estimate Cs concentrations in coastal seawater to be in the range of 10(2)-10(3) Bqm(-3). These estimates show that, 3 months after the accident and maximal release of radioactive Cs, levels of Cs persisted in coastal waters, although at levels that were two orders of magnitude lower than at the time of release. These June coastal seawater Cs levels were four orders of magnitude above Cs concentrations off Japan prior to the Fukushima disaster.
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