this strikes me as the sort of thing that ends up as an engineering enhancement to an RTG that’s like “hybrid radio fusion heat engine” and uses a radioactive s

this strikes me as the sort of thing that ends up as an engineering enhancement to an RTG that’s like “hybrid radio fusion heat engine” and uses a radioactive source together with this lattice confinement fusion material and end up with something like a 20% efficiency instead of the current 7.5%, but is otherwise never used outside of space probes.