For each factor of seven increase in time, the radiation from fallout is reduced by a factor of ten. You can measure the half-life of fallout in hours, not years. Most of the material caught-up in a nuclear blast is not naturally radioactive, so it’s temporary charge is very short lived. ![]() Within 30 days the radiation is essentially gone – except for a few long living isotopes (variations of strontium and iodine) that will continue to show up for years in certain foods (like milk). ![]()
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