Contamination of sea urchin Mesocentrotus nudus by radiocesium released during the Fukushima Daiichi Nuclear Power Plant accident.

The ACF of 137 Cs in the gonads of sea urchins from the Yotsukura and Ena stations showed a decreasing trend, but the ACF was not significantly correlated with the number of days since the accident at either the Yotsukura stations ( r s = −0.24, p = 0.18) or the Ena stations ( r s = −0.10, p = 0.69).

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