High Z: Metal Foams Shield X-Rays, Gamma Rays and Neutron Radiation (2015)

Multilayered mirrors are another approach. https://inis.iaea.org/collection/NCLCollectionStore/_Public/...

Would High-Z Metal Foams -- make good shielding for future human spacecraft?

At this point in time, I don't know... but it seems possible...

(One can only ponder and speculate...)