![I got a keychain that uses the radioactive decay of Tritium (the radioactive isotope of hydrogen) to emit light. : r/mildlyinteresting I got a keychain that uses the radioactive decay of Tritium (the radioactive isotope of hydrogen) to emit light. : r/mildlyinteresting](https://i.redd.it/w8aszm9jxzi41.jpg)
I got a keychain that uses the radioactive decay of Tritium (the radioactive isotope of hydrogen) to emit light. : r/mildlyinteresting
![Tritium Light Stainless Steel Tritium Key Chain Including Tritium Vials 3mm*22.5mm Tritium Tube Automatic Light 25 Years-green - Hasps - AliExpress Tritium Light Stainless Steel Tritium Key Chain Including Tritium Vials 3mm*22.5mm Tritium Tube Automatic Light 25 Years-green - Hasps - AliExpress](https://ae01.alicdn.com/kf/HTB1esfFeSzqK1RjSZPxq6A4tVXaG/tritium-light-stainless-steel-tritium-key-chain-including-tritium-vials-3mm-22-5mm-tritium-tube-Automatic.jpg_.webp)
Tritium Light Stainless Steel Tritium Key Chain Including Tritium Vials 3mm*22.5mm Tritium Tube Automatic Light 25 Years-green - Hasps - AliExpress
![Isotope Triode Fob - Tritium Vial Housing Keychain - 3mm x 23mm or 3mm by 11mm - Camping Accessories - Gifts for Men Isotope Triode Fob - Tritium Vial Housing Keychain - 3mm x 23mm or 3mm by 11mm - Camping Accessories - Gifts for Men](https://m.media-amazon.com/images/W/IMAGERENDERING_521856-T1/images/I/71WwQ39urRL._AC_UY350_.jpg)