Cherenkov radiation is probably the best real life Hollywood-like radiation glow. I think a good way to think about this is to remember that for our eyes to see something “glowing” it has to be emitting by definition visible light. But why would radioactive material emit viable light or trigger the emission of visible light when again by definition it’s emitting “radiation” , meaning either neutrons, gamma rays, electrons, or other high energy particles? None of those radiated particles are visible. However , there is a phenomenon called “phosphene” where radiation triggers the perception of light, or where the radiation causes Cherenkov light to be released within the eye itself. Radium for example, while not making girls actually glow, does appear to glow faintly blue in the dark. This is from high energy electrons striking nitrogen in the air. Maybe you could use that .