> That's part of why thermonuclear weapons have such a disturbingly high "bang for the buck." The enriched uranium or plutonium primary is really expensive. So

> That's part of why thermonuclear weapons have such a disturbingly high "bang for the buck." The enriched uranium or plutonium primary is really expensive. So is the rocket that gets it where it's going. But the lithium deuteride that makes up the fusion fuel is comparatively dirt cheap. No idea what the cost of enriched U, Pu, or lithium deuteride is, but I'll note that A) current day thermonuclear warheads deliver an estimated 50% of the total output through fission of enriched U (casing) and Pu (primary) B) the lithium in lithium deuteride, as well as the deuterium, need to be enriched, so probably not quite dirt cheap (depends on your definition of dirt cheap I guess)?