CPC Subgroup
G01T 1/18 with counting-tube arrangements, e.g. with Geiger counters (tubes H01J47/08; )
Full Title
Measuring X-radiation, gamma radiation, corpuscular radiation, or cosmic radiation (G01T3/00, G01T5/00 take precedence) > Measuring radiation intensity (G01T1/29 takes precedence ) > with counting-tube arrangements, e.g. with Geiger counters (tubes H01J47/08; )