What radioactive substance is often used for nuclear power

(Uranium Atoms)
Uranium is the fuel most widely used in nuclear reactors at power plants. Nuclear energy is created when uranium atoms are split in a process called fission. Uranium is also mildly radioactive.

not sure if this helps! :)

This is what i found “nuclear fuel is material used in nuclear power stations to produce heat to power turbines. heat is created when nuclear fuel undergoes nuclear fission. most nuclear fuels contain heavy fissile actinide elements that are capable of undergoing and sustaining nuclear fission.” i hope this you for what your looking for. can you plz mark me brainliest?