🚀 go-pugleaf

Baby powder (boric acid) seems to work, too.
Mike J

> > > Could someone be so kind as to suggest what materials are the
cheapest
> > > and most effective for neutron shielding if one is NOT interested in
> breeding
> > > any other fuel?
> >
> > Water, wood, paraffin, and concrete.
> 
> If you have access to a chem lab you can make a material which is pretty
> effective as a neutron shield. You will need paraffin wax, heavy water
(D2O), a
> trace of base (NaOH) and a bomb (a steel pressure reaction vessel).
> 
> In the bomb place a quantity of paraffin wax, an excess of heavy water
> sufficient to fill the bomb, and a trace of base. Observing safety
precautions,
> heat the bomb to above the critical temperature of heavy water, 371 C.
Cook
> overnight. The extent of deuterium exchange can be measured using
deuterium NMR.