Geiger-Muller SBM-20, size:11h11h108mm Geiger-Muller SBM-20 (SBM20, GMS 20, cbm-20, cbm20, cbm 20) Geiger-Muller SBM-20 is designed to measure ... Technical characteristics of the devices Geiger-Muller SBM-20: The source of radiation - Cs; Sensitivity to gamma radiation:MED - 4.0 ... ,5 mR -1; Rated operating voltage device Geiger-Muller GMS-20 - 400; Voltage start counting - 260V-320V; Slowness of the ...