Scientists have raised concern over the rate of radioactive contamination of the Pacific, due to the Fukushima nuclear accident. Expert : Plutonium-241 from Fukushima nearly 70,000 times more than atomic bomb fallout in Japan. Officials : Molten fuel now ‘particle-like’, contains ‘special’ nuclear materials. Gov’t Labs : Large areas of oceans contaminated by plutonium from events such as Fukushima; Build-up …