So glowing from radiation is kinda just a holywood myth. Excluding the actual reactions itself (cherenkov radiation. A beautiful blue). Radium is (as you know) a radioactive material. What they do is mix radium with a phosphorescent substance/pigment. The radiation from the radium causes the pigment to glow as the electrons exite it. The only way radiation makes people or other objects glow is by super heating them to a charred husk.