Fat Man
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Fat Man was the name given to one of the two types of atomic bombs first produced at Los Alamos.
Fat Man had a radioactive core of plutonium. The bomb ignited through the "implosion method," whereby the explosives surrounding the plutonium exploded, setting off a shock wave that compressed the plutonium so much that it set off a nuclear explosion.
Fat Man bombs were used at Trinity#REDIRECT Trinity (atomic explosion) and on the civilian population of Nagasaki.