The First Atomic Weapons
The Atomic Bombing of Hiroshima - The Daily 360 - The New York Timesand for for how to decline a job offer after accepting it
For a detailed timeline of the bombings, please see Hiroshima and Nagasaki Bombing Timeline. On August 6, , the United States dropped an atomic bomb on the city of Hiroshima. The bomb was known as "Little Boy", a uranium gun-type bomb that exploded with about thirteen kilotons of force. At the time of the bombing, Hiroshima was home to ,, civilians as well as 43, soldiers. Between 90, and , people are believed to have died from the bomb in the four-month period following the explosion.
Fat Man, which was dropped on Nagasaki, was the more complex of the two. A bulbous, ft. This would compress the plutonium sphere to a critical density and set off a nuclear chain-reaction. Scientists at Los Alamos were not entirely confident in the in the plutonium bomb design, so they scheduled the Trinity test. The Little Boy type of bomb, which was dropped on Hiroshima, had a much simpler design than the Fat Man model that had been tested at Trinity.
Concurrent with the preparations for the Trinity test, preparations were being made for the delivery of operational atomic weapons to Tinian Island in the Pacific for use against Japan at the earliest possible date. Two weapon designs were available for use - the gun assembly Little Boy bomb that used uranium highly enriched in U, and the implosion assembly Fat Man that used plutonium. It was this weapon that was dropped on Hiroshima. Another Little Boy weapon would not have been ready for months, for this reason only one Little Boy unit was prepared. In contrast many Fat Man bomb assemblies were on hand without plutonium , and the actual "Fat Man bomb" delivered against Japan only existed when assembly of the Fat Man unit with the plutonium core was completed shortly before the mission.
An explosive nuclear chain reaction occurs when a sufficient quantity of nuclear fuel, such as uranium or plutonium, is brought together to form a critical mass. This is the minimum amount of fissionable material needed to start a chain reaction.
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It was the first nuclear weapon used in warfare. Tibbets, Jr. The Hiroshima bombing was the second man-made nuclear explosion in history, after the Trinity test , and the first uranium -based detonation. Like Thin Man, it was a gun-type fission weapon , but it derived its explosive power from the nuclear fission of uranium , whereas Thin Man was based on fission of plutonium Fission was accomplished by shooting a hollow cylinder of enriched uranium the "bullet" onto a solid cylinder of the same material the "target" by means of a charge of nitrocellulose propellant powder. Its components were fabricated at three different plants so that no one would have a copy of the complete design. After the war ended, it was not expected that the inefficient Little Boy design would ever again be required, and many plans and diagrams were destroyed.
August was the first — and only — time that atomic bombs were used in warfare. On Aug. Three days later, the U. The shell of an apartment building 2, feet from ground zero in Hiroshima is all that is left following the dropping of the atom bomb on this Japanese city in The United States called for the unconditional surrender of the Japanese armed forces in the Potsdam Declaration on July 26, A uranium atomic bomb called "Little Boy" was dropped on Hiroshima on Aug.
The Story of Hiroshima
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The bomb was dropped at approximately (JST) 6 August It was less powerful than the Fat Man, which was.
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