Depending on the radiation released, your current location may be best. Assuming you have a roof over your head that can deflect radioactive rain. The fallout from Fukushima went everywhere and there was no escape, except perhaps underground with access to deep wells. Everyone else gets irradiated so the question then becomes how badly.
Staying out of the rain is kind of critical.
If it's large doses of gamma fallout with a half life of 100,000 years, then we, and almost all surface life here, are pretty much done. Some ocean life may survive even that. Assuming we can keep the water if the plankton die. Life will return later on, but we will be extinct long before then.
Most bombs will airburst and are highly efficient. Airburst typically will have minimal fallout. Im not even sure fallout will be the main issue in a modern nuclear war. Obviously the places directly hit will be irradiated but there may not be much affect on everything else. The first bombs they dropped on japan were pretty shitty and only a fraction of the uranium actually detonated. Modern bombs are likely to detonate 99% of the fissile material.
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