ore than 18 months after a magnitude 9.0 earthquake, 40-foot tsunami and nuclear power plant woes that struck Japan starting March 11, 2011, levels of radioactive cesium 134 and cesium 137 originating from the crippled Fukushima-Daiichi plant remain elevated in some fish and seafood in nearby waters.
That suggests that radiation from the plant is still being released into the ocean, wrote Ken Buesseler, a marine of the Woods Hole Oceanographic Institution in Woods Hole, Mass., in a perspective article in Friday’s edition of the journal Nature.
The news was not all dire. The “vast majority” of fish near Fukushima, Buesseler wrote, have radioactive cesium levels below the strict limits for seafood consumption adopted by the Japanese government in April 2012 to assuage consumer fears. And fish that migrate out of the area lose their cesium rapidly.As an example, Buesseler cited the example of bluefin tuna caught off the California coast, which carried minuscule-but-detectable amounts of radioactive cesium all the way across the Pacific.
But to fully understand how much radiation is in fish and seafood near the Fukushima Daiichiplant now and in the future, Buesseler added, studying the marine life caught in the area won’t be enough: Scientists will also need to learn more about where the cesium near the ocean floor is coming from and how it collects and accumulates.
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