[dotancohen]

  > But there would be no point, because they would have no way to refine it out

Why not? I'm not a subject manner expert, but from my armchair it seems that refining one element from another is far more straightforward than refining one isotope from another as is done with Uranium.

I would expect that hydrogen and lithium should be able to be refined chemically, as both are very reactive elements. And even if mechanical refining is necessary, we have much industry experience with that: Uranium isotopes have been mechanically refined for almost a century. Furthermore, lithium and hydrogen are far more dissimilar than are U235 and U238 - lithium has six times the atomic weight of standard hydrogen and double the atomic weight of tritium.

[pencilguin]

See, this is how they find pigeons to hand over all their money.

[DennisP]

"Gee that guy made a good point...I don't really have an answer...I know, call him a pigeon!"