- Nuclear material was Uranium 235.
- Energy released was equivalent to 12.5 kilotons of TNT dynamite.
- Maximum temperature at burst point was several million degrees centigrade.
- A fireball of 30 meters diameter formed in 0.1 millisecond, with a temperature of 300,000 degrees centigrade and expanded to its maximum size in one second.
- The top of the atomic cloud reached an altitude of 17,000 meters.
- Radioactive debris was deposited by "black rain" that fell heavily for an hour over a wide area.
- Maximum wind pressure of the blast: 35 tons per square meter.
- Maximum wind velocity: 440 meters per second.
- Wooden houses within 2.3 kilometers of ground zero collapsed.
- Concrete buildings near ground zero hit by the blast from above had ceilings crushed and windows and doors blown off.
- Many people were trapped under fallen structures and burned to death.
- People exposed within 500 meters of ground zero were killed by the radiation.
- People exposed at distances of 3 to 5 kilometers later showed radiation symptoms, including radiation-induced cancers.
- More than 100,000 people died in the atomic explosions at Hiroshima and Nagasaki.
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