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