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