{TAIL ~ An accelerating electrode field} is set up in the chamber by {HEAD ~ one or more electrodes}, and the chamber is sealed by an electronically conductive barrier so as to prevent gas leaking into the chamber, whilst being sufficiently thin to enable charged particles to travel across the barrier and thereby be detected by the detector 
{ TAIL ~ An accelerating electrode field } is set up in the chamber by { HEAD ~ one or more electrodes } , and the chamber is sealed by an electronically conductive barrier so as to prevent gas leaking into the chamber , whilst being sufficiently thin to enable charged particles to travel across the barrier and thereby be detected by the detector
TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH