Tritium is use mostly for watch markers, which you can see at night.
This is a replaced idea that during the early part of the last century
after the original way was found to kill those who applied it. If you
have an old watch with the old type glow, you can't get it repainted,
they don't like to have that dust in the air. Okay sorry this isn't
newton but hey since I was a watch repair person I figured I would share.
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