you seem to be positing a particular kind of so-called revolution. maybe you could be more explicit about it? people move radioactive materials now, so if people moved it later, why wouldn't they use the same safety measures?
unless structurally those safety measures were no longer available/possible, which would only happen under certain conditions. are you assuming a rupture, during which all current power options stop? or a plague, in which all current experienced and/or knowledgeable people die? or both? or something else?
in either of those cases there are many many causes of extreme toxicity that will happen. just the decomposition of so many bodies in one place will be overwhelming on whatever local level (consider the toxicity of new orleans as a beginning).
it's true that nuclear waste lasts longer than other kinds, but consider what happened in chernobyl, which is now, bizarrely enough, a wildlife refuge (not necessarily a healthy one, but...), because humans are afraid to develop there.
at any rate, these "post-revolutionary" questions need a bit more fleshing out to be approached at all usefully.