{HEAD ~ An accelerating electrode field} is set up in the chamber by one or more electrodes, and {TAIL ~ 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 
{ HEAD ~ An accelerating electrode field } is set up in the chamber by one or more electrodes , and { TAIL ~ 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
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