EDC Tritium Vials - the original Swiss made Trigalight Tritium capsules as used in many high-end Swiss made watches. The electric energy in the tritium vial is generated by the tritium gas, a low radiation beta emitter. When decaying the tritium looses electrons. When such an electron hits the powder layer it is captured and transformed into light. Ideal for use in Tec Accessories Glow-Fobs and Isotope Fobs or for DIY Tritium Projects.