Further use for Thorium
Thorium oxide is used in "thoriated" tungsten electrodes for TIG welding.
Being phased out due to dust hazards when electrodes are re-ground.
The units of resistivity don't come out right.
10^-8 Ohm * m
m Ohm * cm
the 'm' should be a 'mu', but unfortunately they both look the same in the latin alphabet.