Plutonium

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Plutonium was first produced in 1941, and its most widespread isotope is Plutonium-239. Pu-239 is used in nuclear reactors of ships and stations, as well as in nuclear weapons till present day. In the recent hundreds of years, more effective fissile materials were discovered and isolated, but Plutonium is still considered to be cheaper and faster to produce than most of its substitutes.