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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.
The bomb was dropped on Hiroshima on August 6, 1945 at a height of 31,000 ft (9,400 m). The time was 8:15 (JST). The actual detonation occurred at 1,900 ft (580 m). The bomb exploded with a force equal to 15 to 18 kilotons of TNT (about 54 to 75 t).