How long would it take for radiation to clear after a nuclear war?

How long would it take for radiation to clear after a nuclear war? For the survivors of a nuclear war, this lingering radiation hazard could represent a grave threat for as long as 1 to 5 years after the attack.

For the survivors of a nuclear war, this lingering radiation hazard could represent a grave threat for as long as 1 to 5 years after the attack.
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