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 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. |