The facts and figures of the 1945 disaster.
The Hiroshima Bomb - Code name: "Little Boy".
Size: length - 3 meters
diameter - 0.7 meters.
Weight: 4 tons.
Nuclear material: Uranium 235.
Energy released: equivalent to 12.5 kilotons of TNT.
The Initial Conditions
There was a maximum temperature at burst point of around several million degrees centigrade. A fireball of 15-meters radius formed in 0.1 milliseconds, with a temperature of 300,000 degrees centigrade, and it then expanded to its huge maximum size in one second. The top of the atomic cloud reached an altitude of 17,000 meters.
Hiroshima Figures
Population - The estimated pre-bomb population was 300,000 to 400,000. Because official documents were burned, the exact population is uncertain.
Deaths - With an uncertain population figure, the death toll could only be estimated. The death count reached 140,000 (plus or minus 10,000) by the end of December, 1945.
