Yeah I believe it was tritium too which is somewhat naturally occurring.
(If they aren't lying that is!!!)
Tritium typically has a half-life of about 10 or so years.
Tritium is used to make watches glow I think.
Oh this did make me remember the story about the "Radium Girls" painting clock dials. Do a DDG search for articles & joo tube to watch some videos. Poor broads got fucked up and over by that shit. I think their is also a movie about it called... Radium Girls. Another somewhat related story to the girls is "The Radioactive Boy Scout". Again, some quick interwebs searching will tell you that story, hekken wild shit.
You will occasionally see tritium in a watch but more often a luminescent paint is used. It has to be "charged" by direct light for it to glow and except for the really high end stuff (Omega, Rolex) doesn't last super long. Tritium simply glows all by itself ,from my understanding, and is in a liquid form. You get it to stay I one spot by trapping it in some kind of container. Take a look at night sites from trijicon or meprolite for a good example.
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