launched a nationwide campaign to protect citizens from the dangers of fallout. At the climax of the Cold War in the 1960s, the U.S. For this reason, fallout can be much deadlier than the fire and heat from the detonation itself. Even brief exposure to fallout radiation may prove fatal. The deadly detritus showers down in a dry and lethal rain for days or even months afterward, with particles so small as to be invisible. Carried by the wind, this cloud of radioactive material may spread far from the location of detonation, sometimes hundreds of miles. It vaporizes millions of tons of solids-earth, buildings, plant and animal life-and propels them into the troposphere, as high as 15 miles skyward. The blast destroys everything in a one to three mile radius. Click the image to watch "Radiological Defense," a 1961 film on fallout protection by the Office of Civil Defense.Ī nuclear bomb detonates.
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