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