Of course the idea that the levels of Plutonium contamination of the Fukushima site by the IAEA could not be distinguished between the level of Plutonium fallout from the use of above ground testing from the 1940s to 1960s ... is the b*lls*it statement.
Edano announced on TV that the plutonium likely came from one of the reactors. However, the amounts found weren't that high--0.18 and 0.54 Bq/kg of soil in the two samples that found plutonium-238, so that's only a few times above background. And plutonium-238 doesn't have to come from the MOX fuel in number 3. It is fission by-product in all of the reactors so at this point, I don't think anyone really knows exactly which reactor it came from since any or all four of them might have had some sort of breach of containment.
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