In a message dated 12/1/06 8:43:00 AM, samdlugach at mac.com writes: > Radium watch dials, Americium smoke detectors, and Thorium gas mantles > My watch dial is Tritium (Fortis Cosmonaut). I think that's also alpha radiation, probably can't penetrate the sapphire crystal. Tim Sassoon SFD vfx & creative post Santa Monica, CA