Major actinides is a term used in thenuclear power industry that refers to the isotopes ofplutonium (239 Pu)uranium (235 U, 238 U) andthorium (232 Th) present innuclear fuel, as opposed to theminor actinidesneptunium,americium,curium,berkelium, andcalifornium, including other isotopes of uranium and plutonium and other actinides.[1]
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