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Where on earth did you get a tritium glow tube? I went looking for one a while back, and nobody sold them anymore because they were considered radioactive materials.

eBay. <img src="/ubbthreads/images/graemlins/laugh.gif" alt="" /> There's someone that sells them on candlepowerforums too. I bought a glass tritium rod on eBay that's like 4" long. Gotta be careful not to drop it, no plastic coating. I recently saw a tritium exit sign on eBay, some big rods in there.<<

Is/was yours fairly bright? I know they get darker as they get old and the tritium decays.