That's actually what we do, in this case: nuclear reactor-derived tritium is the *sole* source of helium-3. https://en.wikipedia.org/wiki/Helium-3#Human_produc

That's actually what we do, in this case: nuclear reactor-derived tritium is the *sole* source of helium-3. https://en.wikipedia.org/wiki/Helium-3#Human_production https://en.wikipedia.org/wiki/Helium-3#Human_production It's *ten* times more expensive than gold! (If I remember correctly, medical ³He MRI's are done on a closed rebreather -- they literally want to recycle your lung air, it's that valuable).