I was just watching an old Roger Corman film about 7 survivors of a nuclear exchange. The father was a proto survivalist with food, supplies and one model 10 revolver in a valley surrounded by heavy lead deposits. They were attacked by this mutated ex boyfriend of the girl, now looking like some Nietzche nightmare. Potassium Iodide will protect your thyroid, true. But think about it, the rest of you is going to look like a Roger Corman special effect anyway.