They're not hot enough to harm you, but some tuna still carry radioactive caesium from the leak at Japan's Fukushima Daiichi plant last March. This creates an opportunity to track some elusive marine animals.rnDaniel Madigan of Stanford University in California found detectable levels of a radioactive caesium isotope in 15 Pacific bluefin tuna (Thunnus orientalis) off the coast of San Diego, California, in August 2011. The fish, which migrate across the Pacific Ocean, can pick up caesium from the water they swim in and the food they eat. The isotope was not detected in fish that were caught before 2011.
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