the readout being electrical (H01J47/20 takes precedence)

Full Title

Tubes for determining the presence, intensity, density or energy of radiation or particles ( ; photoelectric discharge tubes not involving the ionisation of a gas H01J40/00 ) > Parallel electrode spark or streamer chambers; Wire spark or streamer chambers > characterised by readout of each individual wire > the readout being electrical (H01J47/20 takes precedence)