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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. The chain reaction starts when neutrons strike the heavy uranium or plutonium nucleus which splits releasing a tremendous amount of energy along with two or more neutrons which, in turn split more nuclei, and so on. In this gun-type device, the critical mass is achieved when a uranium projectile which is sub-critical is fired through a gun barrel at a uranium target which is also sub-critical. The resulting uranium mass comprised of both projectile and target becomes critical and the chain reaction begins.
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Little Boy and Fat Man

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Little Boy and Fat Man | Atomic Heritage Foundation

In essence, the Little Boy design consisted of a gun that fired one mass of uranium at another mass of uranium , thus creating a supercritical mass. A crucial requirement was that the pieces be brought together in a time shorter than the time between spontaneous fissions. Once the two pieces of uranium are brought together, the initiator introduces a burst of neutrons and the chain reaction begins, continuing until the energy released becomes so great that the bomb simply blows itself apart. The initial design for the plutonium bomb was also based on using a simple gun design known as the "Thin Man" like the uranium bomb.
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It was the second of the only two nuclear weapons ever used in warfare, the first being Little Boy , and its detonation marked the third nuclear explosion in history. The name Fat Man refers to the early design of the bomb because it had a wide, round shape; it was also known as the Mark III. Fat Man was an implosion-type nuclear weapon with a solid plutonium core. The first of that type to be detonated was the Gadget in the Trinity nuclear test less than a month earlier on 16 July at the Alamogordo Bombing and Gunnery Range in New Mexico.
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The film is named after " Little Boy " and " Fat Man ", the two bombs dropped on the Japanese cities of Hiroshima and Nagasaki respectively. In September , U. Army Corps of Engineers Colonel Leslie Groves Paul Newman who oversaw construction of the Pentagon is assigned to head the ultra-secret Manhattan Project, to beat the Germans, who have a similar nuclear weapons program.
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