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.
en.wikipedia.org/wiki/Tritium_illumination
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.
These give off about 1 micro-Sievert of radiation per hour. This is roughly the same amount of radiation you could get by eating 10 bananas.
A banana gives off roughly 0.1 micro-Sieverts. This amount is known as a Banana Equivalent Dose, or BED. Yes, this is a literal "banana for scale" reference:
en.wikipedia.org/wiki/Banana_equivalent_dose
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Vial Source for Makers:
www.mixglo.com/
Jewelry Sources:
www.etsy.com/shop/steelhipdesign
www.shapeways.com/designer/Tofty
www.shapeways.com/designer/CreativeMinds
www.etsy.com/shop/InnovoDesign
www.etsy.com/shop/MerkavaGlowrings
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