Tritium Jewelry
Tritium tubes are simply gas-filled, thin glass vials with inner surfaces coated with a phosphor.
The gaseous tritium in these light sources undergoes beta decay, releasing electrons that cause the phosphor layer to fluoresce.
Tritium presents no external radiation threat via beta radiation when encapsulated in non-hydrogen-permeable containers due to its low penetration depth, which is insufficient to penetrate intact human skin.
These light sources can glow up to ten years without needing any kind of charging. Tritium presents no external radiation threat via beta radiation when encapsulated in non-hydrogen-permeable containers due to its low penetration depth, which is insufficient to penetrate intact human skin. However, these devices do emit low levels of X-rays.
ok, this looks pretty cool