Tritium

Tritium is a gaseous radioactive isotope of hydrogen. When tritium-emitted electrons interact with a phosphor material, fluorescent light is created. This process is called radioluminiscence.

Because tritium light does not need of any electric power, it has been used for a long time in different fields, mainly emergency exit signs or wristwatches, but its field of applications can still be expanded.

Tritium2 Tritium

Sources:

http://en.wikipedia.org/wiki/Tritium_illumination

https://www.usfa.fema.gov/downloads/pdf/techtalk/techtalk_v1n1_0709.pdf

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