How do you propose sourcing Helium? Barring a few atoms here and there from fusion experiments and H-bombs I don't know of a good source without leaving the planet.
If the natural production of Helium via radioactive decay in the Earth isn't enough, we can use create it from Boron and Lithium after using copious amounts of energy to accelerate protons into them, or for just Lithium, Deuterium.