What is tritium lamp?

A tritium lamp, also known as a betalight, is a type of self-powered gas-discharge lamp that uses tritium gas to produce light. Tritium is a radioactive isotope of hydrogen that emits beta particles, which cause phosphor to glow. The light emitted from a tritium lamp is produced by the interaction of the beta particles with the phosphor coating inside the lamp.

Tritium lamps are small and lightweight, and have a long service life. They are widely used for military and industrial applications, as well as in watches, keychains, and other personal items that require constant low-level lighting. Unlike other types of gas-discharge lamps, tritium lamps do not require external power sources or batteries, and can operate in extreme environments, including high altitudes, underwater, and in space.

Although tritium is radioactive, the gas used in tritium lamps is contained within a sealed glass tube, and is considered safe for use in consumer products. However, tritium lamps are regulated by various government agencies, and must meet strict safety standards to ensure that they do not pose a risk to the public.