Depends on where the radiation is/was. Fallout in exposed areas that are well drained would be washed away by the rain over time (of course the fallout would just be deposited somewhere else). Metal objects that were exposed to hard radiation during the blasts would themselves stay radioactive for decades or even centuries. Off the coast of my state, Western Australia, there were nuclear tests at the Monte Bello Islands and it is forbidden for visitors there to pick up any bits of metal they find because they are radioactive.
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 "It is better to be feared than loved" - Nicolo Machiavelli
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