> I don't think nuclei emit any light except when they're either fusing or breaking apart. There's always exceptions, thorium has a low-energy isomer that deca

> I don't think nuclei emit any light except when they're either fusing or breaking apart. There's always exceptions, thorium has a low-energy isomer that decays via gamma rays that are in the UV range. https://en.wikipedia.org/wiki/Isotopes_of_thorium#Thorium-229m https://en.wikipedia.org/wiki/Isotopes_of_thorium#Thorium-22...