An X ray generator includes a cathode having an emitter made of carbon nanotubes which emits {TAIL ~ electrons} by field emission and thus becomes {HEAD ~ a cold cathode electron emission source} 
An X ray generator includes a cathode having an emitter made of carbon nanotubes which emits { TAIL ~ electrons } by field emission and thus becomes { HEAD ~ a cold cathode electron emission source }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD