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Demon core - Wikipedia, the free encyclopedia
The demon core was a 6.2-kilogram (14 lb; 1 st), 3.5-inch-diameter (89 mm) subcritical mass of plutonium which went briefly critical in two separate accidents at the Los Alamos laboratory in 1945 and 1946. Each incident resulted in the acute radiation poisoning and subsequent death of a scientist. After these incidents the spherical plutonium pit was referred to as the "demon core."
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