A superpower to generate, amplify, absorb or project radioactive energy, as well as control alpha particles, beta particles, gamma rays and neutron particles. Also, it allows to solidify and create constructs out of radiation, such as weapons, armories, buildings, organisms etc.
Let's add to that radiation sickness, necrosis and various types of cancers, emitting electromagnetic impulses, nullifying morphine, emitting large amounts of heat, causing mutations, disintegrating DNA, nullifying regeneration, flying, as well as good old radioactive energy attacks.
So much potential, how will you utilize it?