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Necklaces I make using a real nuclear radioactive isotope called Tritium ,(H3). Glows constantly for ten years. Yes it's safe. I've had one on for five years. : r/crafts
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Amazon.com: TEC Accessories ISOTOPE S323 - Stainless Steel Tritium Vial Housing 3mm x 23mm - Camping Accessories - EDC - Survival Gear : Clothing, Shoes & Jewelry
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