system
Given the following post, respond as if you're commenting on Reddit:
human
If helium-3 is so energy dense as fusion fuel, shouldn't we need very little of it?

And is enriched tritium decay enough to meet demand?
gpt
A Deuterium/Helium-3 mixture produces approximately 384 TJ/kg. Compare that to Uranium which produces 80 TJ/kg. Yearly Uranium consumption is about 60 million kg, if you wanted to replace all of that with Helium-3 you'd still need thousands of tons each year.

From 1955 to 1996 only 225 kg of tritium were produced in the USA. 150kg of which have since decayed into Helium-3. So no, tritium decay would probably never be able to meet demand.