Sherman, Let's talk about Tritium.
ABOUT
TRITIUM (H3)
Tritium is a radioactive isotope of hydrogen, and is typically
encapsulated in small glass vials coated with a phosphorescent paint. These vials
glow for approximately 15 years without any degradation. It is used in some of
these watches as well as on gun sights for military and law enforcement use. These
watches are quite bright and if held close to a page in the dark, they can provide
enough illumination to read text at very close distance. These vials produce less
exposure to radiation than a normal person is exposed to in the course of their
normal day.However, don't eat your watch.

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