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An estimated 40,000 people were killed outright by the bombing at Nagasaki, and about 25,000 were injured. Many thousands more would die later from related injuries, and radiation sickness chow yun fat from nuclear fallout. "Fat Man" was an implosion type weapon using plutonium. A subcritical sphere of plutonium was placed in the center of a hollow sphere of high explosive. Numerous detonators located on the surface of the high explosive were chow yun fat fired simultaneously to produce a powerful inward pressure on the core, squeezing it and increasing its density, resulting in chow yun fat a supercritical condition and a nuclear explosion. Illustration of the implosion concept. At first it was thought that two pieces of sub-critical plutonium (Pu-239) could simply be shot into one another to create a nuclear explosion, and a plutonium gun-type design of this sort (known as the "Thin Man" bomb) was worked on for some time during the Manhattan Project. However it was discovered that plutonium created for the bomb in the nuclear reactors at Hanford, Washington, even though it was super-grade weapon plutonium containing only about 0.9%
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