| http://www.w3.org/ns/prov#value | - The problem is mainly residual Plutonium, Americium and other elements, with half-lives of several thousand or tens of thousands of years, which require hundreds of thousands of years to decay to such levels. (Because of the very damaging high energy alpha decay, rather than lower energy and much less damaging beta and gamma decays.) On the one hand non-fissle transuranic elements capture neutrons
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