![]() ![]() ![]() The demon core was a spherical 6.2-kilogram (14 lb) subcritical mass of plutonium 89 millimetres (3.5 in) in diameter, manufactured during World War II by the United States nuclear weapon development effort, the Manhattan Project, as a fissile core for an early atomic bomb. ![]() The sphere of plutonium is surrounded by neutron-reflecting tungsten carbide blocks. A re-creation of the experiment involved in the 1945 incident. ![]()
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