Uranium is the main fuel used, but in some countries a mixture of uranium and plutonium is also used (MOX fuel)
Plutonium can be used in nuclear reactors for nuclear propulsion of ships and submarines.
There may be Radium, Thorium, Uranium or even Plutonium which can be used in nuclear reactors.
Nuclear Weapons Nuclear Reactors Nuclear Batteries
We usually find that uranium is used as fuel in nuclear reactors (though some use plutonium).
Uranium and plutonium are both actinides that are used in nuclear reactors.
Uranium (U) Or Plutonium (Pu)
Usually Uranium 235 but sometimes Plutonium 239
radioactive element like uranium, plutonium......etc depends which type of nuclear reactor.
You probably are thinking of plutonium
Nuclear reactors and nuclear weapons
Plutonium can be used in nuclear reactors for nuclear propulsion of ships and submarines.
Uranium and plutonium can be used as nuclear fuels for nuclear reactors.
Plutonium is used as nuclear fuel for nuclear reactors. Plutonium isotopes (239, 241) are fissionable with thermal neutrons releasing an extremely great quantity of energy.
Plutonium is used as nuclear fuel for nuclear reactors to produce electric energy. Also plutonium is indispensable for nuclear weapons.
There may be Radium, Thorium, Uranium or even Plutonium which can be used in nuclear reactors.
Uranium and/or Plutonium fuel
Plutonium (as a metal or oxide , mixed oxide, carbide) can be used as nuclear fuel in nuclear reactors.