In another embodiment of the invention, {TAIL ~ the material} of {HEAD ~ the carrier} is thoriated tungsten, which comprises thorium dioxide with the balance tungsten metal 
In another embodiment of the invention , { TAIL ~ the material } of { HEAD ~ the carrier } is thoriated tungsten , which comprises thorium dioxide with the balance tungsten metal
OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH