"L.A. dry run shows urban nuke attack 'a survivable event'"

http://content.usatoday.net/dist/custom/...=41773400.story

There is this great animation show shrinking fallout zone:

http://www.usatoday.com/video/index.html#/Fallout+from+an+improvised+nuclear+device/712474766001

"The government would be preoccupied with so many tasks — identifying the culprit; tracking the effects of the blast; securing government buildings; ushering critical personnel to safe locations; amassing drugs and supplies — that federal help won't arrive for 24 to 72 hours, the White House guidance says."