Uranium is pretty cheap, they don't need enriched uranium (although I'd be interested to know if using the fusion as a neutron source could trigger a decent amount of fission in the hohlraum), they just need a very dense metal.

You should take a look at the LLNL's page on targets.

https://lasers.llnl.gov/about/keys-to-success/targets

https://www.lanl.gov/conferences/tfm/presentations/08-21-12-...