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A subcritical sphere of plutonium was placed in the center of a hollow sphere of high explosive. Numerous detonators located on u235 the surface of the high explosive were fired simultaneously to produce a powerful inward pressure on the core, squeezing it and increasing its density, resulting in a supercritical condition and a nuclear explosion. At first u235 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 u235 for some time during the Manhattan Project.[3] 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% Pu-240, was not as pure as the initial samples of plutonium developed at the cyclotrons at Ernest O.
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