The "Demon Core" refers to a subcritical mass of plutonium that was involved in two criticality accidents at Los Alamos National Laboratory in the early 1940s. The core was part of an early atomic bomb project during World War II. The Demon Core was a 14-pound (6.2 kg) sphere of plutonium-gallium alloy that was originally designed to be part of a third nuclear device for use against Japan.
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