Tritium (or Hydrogen 3) is a real substance. It's produced by stars, and over time it would accumulate on airless bodies. For example, there are proposals here in the real world to mine Tritium from the surface of the moon (where it's been building up for 4 billion years) to use in fusion reactors.
There are asteroid belts in ED, but we currently have no reason to go to them. There are too few asteroids, and there are no hotspots.
Tritium shouldn't be yet another ring hotspot. It should be in asteroid belts. And it should be there in sufficiently high concentrations so that mining it isn't laborious. For explorers, this would make refueling your FC easier because all you have to do is jump into a system and you instantly know if there's an asteroid belt. You don't have to find a gas giant and fly out to it to scan its rings.
The is the perfect opportunity to make use of something that's already in the game, but currently without a purpose.
