what about growing single crystal of quartz with one dopant, and then grafting quartz with another dopant on it

Even if it occurred in significant amounts, at any rate it'd be all hydrolyzed in duodenum in basic conditions releasing alcohol back (where hydrolysis of fats occurs anyway). It works this way, because alcohol partitions into fat phase and is released from there relatively slowly and liver is good at shredding alcohol

ablation provides much higher pressures than direct radiation pressure

also you need to keep your material chemically simple, because when interacting with neutron proton is kicked out of molecule. this leaves water, because all products of that can react back forming water again, same goes for hydrogen. this does not work for oil, for example, that is if you wanted to put oil in nuclear reactor for some reason

liquid hydrogen or liquid methane is great moderator when you need very cold neutrons. remember you can cool down neutrons only down to energy of thermal motion - liquid hydrogen is pretty cold at 20K

or you could make several pieces on solid phase then combine them together. there are many caveats but this can work