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The bomb exploded about 500 m. (1,625 ft.) above the ground and directly beneath it (the hypocentre) was a suburb of schools, factories, and private houses. The radius of destruction for reinforced concrete buildings was 750 m. (2,437 ft.), greater than at Hiroshima where the blast caused by the bomb was more vertical.
Hiroshima, Japanese city, situated some 8M km. (500 mi.) from Tokyo, on which the first operational atomic bomb was dropped at 0815 on 6 August 1945. Nicknamed 'Little Boyââa reference to Rooseveltâthe bomb was 3 m. (9 ft. 9 in.) long, used uranium 235, had the power of 12.5 kilotons of TNT, and weighed 3,600 kg. (nearly 8,000 lb.).