Tritium is a colorless gas and is the only naturally occurring radioisotope of hydrogen. The name Tritium originates from the Greek word meaning ‘tritos’ and refers to the three components of the atom (3H).
‘Tritium has been used for decades in a variety of applications where constant, independent, and long-lasting light sources are essential. On the dials of military watches, you will often find a red, circular symbol with the notation ‘3H’ that refers to the use of tritium. In ‘civil’ watches, the abbreviation ‘T25’ denotes the same thing. In the past, luminous tritium was applied directly to the dial. Today’s watchmakers are more careful and fill the gas into fine tubes made from borosilicate glass, a highly resilient and ISO-certified glass used in chemical engineering. These Gaseous Tritium Light Sources (or GTLS) are not only exceptionally safe, but they also guarantee the watch wearer at least ten years’ constant luminance – without any external energy source. For more information about watches that offer this feature:
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