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This idea started with the mental juxtaposition of ravers with cyalume lightsticks in their mouths, tooth jewelry (gold stars, diamond studs), and the Meprolight tritium sights on my Glock 19. No, it's probably not what you think.
At any rate, why not make jewelry out of encapsulated tritium?
You could create self-luminous "gemstones" for use in everything from tooth inserts (the original idea, although I'd never wear them) to earrings, to necklace pendants (big, bright things you can read by), and on and on and on...Hmmm...I wonder what the number for the Patent Office is...
Does it come with a health warning?
'Radiological research has found a correlation between tritium and cumulative genetic injury.' [angel, Sep 26 2001, last modified Oct 21 2004]
This pigment remains luminous even when being kept in complete darkness for 2200 minutes [chronic irony, Sep 26 2001, last modified Oct 04 2004]
Take a leak with the lights off
A novelty item to replace that nasty wooden seat [chronic irony, Sep 26 2001, last modified Oct 21 2004]
||bm: if it's sufficiently radioactive, I think Sparki might find a whole queue of suitors bearing it. (Sorry, Sparks)
||Kind of baked. Non radioactive long persistance phosphorescent pigments have been around for a long time. Emergency exit signs and glow in the dark toys typically use zinc sulphide doped with copper to give a green glow which can last for up to 12 hours. New variations based on strontium aluminates doped with europium and dysprosium can persist for 24 hours or longer (see link).
However, why bother with jewelry when you can now take a leak without even turning the light on (see link)