If the radium-painted portions are exposed to contact, as in you can touch them, you might want to consider coating them in some clear coat to seal the area and to reduce flaking. By now, the phosphorus is severely decayed by the radium and will flake easily, you do not want to eat or inhale these particles, hence why I say coat the painted surfaces. Just to be safe, I'd always wash hands after using this radio, and consider relegating it to storage for use in ww3.