Japan A-bomb: Hiroshima by the numbers

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Updated: August 6, 2015 2:55:18 PM

Thursday marked the 70th anniversary of the U.S. atomic bombing of Hiroshima on Aug. 6, 1945. A second atomic bomb was dropped on Nagasaki three days later.

Thursday marked the 70th anniversary of the U.S. atomic bombing of Hiroshima on Aug. 6, 1945. A second atomic bomb was dropped on Nagasaki three days later. The U.S. has said the bombings hastened Japan’s surrender and eliminated the need for a U.S. invasion that would have cost many more lives. The toll on the two Japanese cities was heavy. Here’s a look, by the numbers, at that day 70 years ago:

350,000: Population of Hiroshima before the bombing, of which 40,000 were military personnel.

140,000: Estimated death toll, including those who died from radiation-related injuries and illness through Dec. 31, 1945.

300,000: Total death toll to date, including those who have died from radiation-related cancers.

1.2 million: Population of Hiroshima today.

31,500: Height in feet (9,600 meters) from which the B-29 Enola Gay dropped the ”Little Boy” bomb.

2,000: Height in feet (600 meters) at which the bomb exploded 43 seconds after it was dropped.

3,000-4,000: The estimated temperature in Celsius (5,400-7,200 Fahrenheit) at ground zero seconds after the detonation.

8,900: Approximate weight of the ”Little Boy” bomb in pounds (about 4 metric tons).

1,600: Radius in feet (500 meters) from ground zero in which the entire population died that day.

90: Percent of Hiroshima that was destroyed.

45: Minutes after the 8:15 a.m. blast that a ”black rain” of highly radioactive particles started falling.

3-6: Weeks after the bombing during which most of the victims with severe radiation symptoms died.

10 million: Folded paper (“origami”) cranes that decorate the Children’s Peace Monument in Hiroshima each year.

Sources: Hiroshima city government; Japan Ministry of Health, Labor and Welfare; Japan Foreign Ministry.

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