{HEAD ~ A cutter assembly} 8, wherein the thoriated tungsten comprises {TAIL ~ about 2% thorium dioxide} 
{ HEAD ~ A cutter assembly } 8 , wherein the thoriated tungsten comprises { TAIL ~ about 2 % thorium dioxide }
HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL