| − | Fat man had a radioactive core of plutonium. The bomb ignited through the "implosion method," whereby the exposives surrounding the plutonium exploded, setting of 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 exposives surrounding the plutonium exploded, setting of a shock wave that compressed the plutonium so much that it set off a nuclear explosion. |