Radiation is not as scary as you've been led to believe. The main long-term dangers from a really bad nuclear accident are Cs 137 and Sr 90. Both of these have half lives of about 30 years. We past the first half life of the Chernobyl fallout.

The arctic and antarctic regions are literal ninth-circle hellscapes (the ninth circle of hell is the one that is frozen over). Significantly worse than the areas around Chernobyl which is apparently well on the way to becoming a national park.

I'm not sure that there is a 'risk' that the human brain can't process. Risk of what, exactly? Huge cost to the generation that has to move, massive risk if it hits farmland, sure. But even assuming that the 'millions of years' figure is factual - which I doubt - we are certainly going to run out of human race before we run out of land. The risks are all fairly short-term things.

The term national park is a euphemism, considering that all life forms in this exclusion zone suffer from genetic diseases.

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[0] https://en.wikipedia.org/wiki/Effects_of_the_Chernobyl_disas...