An estimated 30% of immediate fatalities were people who received lethal doses of this direct radiation, but died in the firestorm before their radiation injuries would have become apparent. How big was the little boy blast radius?Īpproximately 1.3 kilometres Its lethal radius was approximately 1.3 kilometres (0.8 mi), covering about half of the firestorm area. Is there still radiation in Hiroshima and Nagasaki? The radiation in Hiroshima and Nagasaki today is on a par with the extremely low levels of background radiation (natural radioactivity) present anywhere on Earth. All Japanese homes were seriously damaged up to 6,500 feet in Hiroshima, and to 8,000 feet in Nagasaki. Severe damage to gas holders occured out to 6,500 feet in both cities. How far did Hiroshima damage?įlash ignition of dry, combustible material was observed as far as 6,400 feet from X in Hiroshima, and in Nagasaki as far as 10,000 feet from X. People up to 53 miles away could also experience temporary blindness. How far is the fallout from a nuclear bomb?Ī 1,000-kiloton nuclear blast might produce third-degree burns up to 5 miles away, second-degree burns up to 6 miles away, and first-degree burns up to 7 miles away, according to one estimate from AsapScience.
Over a third of the 50,000 buildings in the target area of Nagasaki were destroyed or seriously damaged. Total destruction spread over an area of about 3 square miles. How far did the radiation from Hiroshima spread? The atomic explosion almost completely destroyed Hiroshima's identity as a city. In both cities the blast totally destroyed everything within a radius of 1 mile from the center of explosion, except for certain reinforced concrete frames as noted above.
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