Nuclear fallout

Residual radioactive material following a nuclear blast .mw-parser-output .hatnote{font-style:italic}.mw-parser-output div.hatnote{padding-left:1.6em;margin-bottom:0.5em}.mw-parser-output .hatnote i{font-style:normal}.mw-parser-output .hatnote+.mw-empty-elt+.hatnote{margin-top:-0.5em}@media print{body.ns-0 .mw-parser-output .hatnote{display:none!important}}"Fallout" redirects here. For other uses, see Fallout (disambiguation). Two possible fallout patterns that could occur during a nuclear attack on the United States (mapped by the Federal Emergency Management Agency on the basis of 1988 data). Atmospheric nuclear weapon tests almost doubled the concentration of radioactive 14C in the Northern Hemisphere called the bomb pulse, before levels slowly declined following the Partial Test Ban Treaty. .mw-parser-output .hlist dl,.mw-parser-output .hlist ol,.mw-parser-output .hlist ul{margin:0;padding:0}.mw-parser-output .hlist dd,.mw-parser-output .hlist dt,.mw-parser-output .hlist li{margin:0;display:inline}.mw-parser-output .hlist.inline,.mw-parser-output .hlist.inline dl,.mw-parser-output .hlist.inline ol,.mw-parser-output .hlist.inline ul,.mw-parser-output .hlist dl dl,.mw-parser-outp