Tritium

Tritium is a radioactive isotope of hydrogen acquired by breeding Lithium. It is very similar to Deuterium on color, only darker.

Uses
Its primary use is fuel (see also Tritium-Deuterium Cake) for the Fusion Reactor along with Deuterium.

It has a use for a plasma grenade.

Although it is used to make thermonuclear weapons, most if not all of them will just use lithium and create tritium on the spot.

It can be used in the Custom Nuke. It contributes 30 to its hydrogen/thermonuclear stage.

Trivia

 * In its rod form, tritium glows a greenish color, while cells and other tanks glow a dark blue-purpleish color.
 * IRL, tritium radioactivity is negligible due to it being unable to pass through skin effectively. It only is dangerous when consumed or otherwise ingested.