Also it's not radiation itself that burns outside the immediate no survival zone, that gets transformed into superheated gasses that travel behind the initial shockwaves. Superheated gasses don't cause radiation burns, they create burns comparable to fire/combustibles, and it doesn't take much to deflect them or shield from, certainly a concrete wall would be best but a desk or even a newspaper could help.
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I suppose a newspaper would do something for alpha particles as well.