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More Info Behind Fallout T-Shirts
Nuclear fallout, or simply fallout, is the residual radioactive material propelled into the upper atmosphere following a nuclear blast, so called because it "falls out" of the sky after the explosion and the shock wave have passed. It commonly refers to the radioactive dust and ash created when a nuclear weapon explodes. Fallout may get entrained with the products of a pyrocumulus cloud and fall as black rain.
This radioactive dust, usually consisting of fission products mixed with standing atoms that are neutron activated by exposure, is a highly dangerous kind of radioactive contamination.