This invention relates to apparatus for detecting charged particles and in particular to {HEAD ~ apparatus} for detecting {TAIL ~ charged particles} in a gaseous environment 
for detecting
This invention relates to apparatus for detecting charged particles and in particular to { HEAD ~ apparatus } for detecting { TAIL ~ charged particles } in a gaseous environment
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH