Residual radioactive material following a nuclear blast
"Fallout" redirects here. For the video game series, see Fallout (series). For other uses, see Fallout (disambiguation).
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Nuclear 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 has passed.[1] It commonly refers to the radioactive dust and ash created when a nuclear weapon explodes. The amount and spread of fallout is a product of the size of the weapon and the altitude at which it is detonated. Fallout may get entrained with the products of a pyrocumulus cloud and fall as black rain (rain darkened by soot and other particulates, which fell within 30–40 minutes of the atomic bombings of Hiroshima and Nagasaki).[2] This radioactive dust, usually consisting of fission products mixed with bystanding atoms that are neutron-activated by exposure, is a form of radioactive contamination.
^"Radioactive Fallout | Effects of Nuclear Weapons | atomicarchive.com". www.atomicarchive.com. Archived from the original on 18 January 2018. Retrieved 31 December 2016.
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