DetectorGM tube type GM125 with 1" end window thickness 1.5 - 2 mg/cm2. End cap is to be removed for Beta Contamination measurement and is retained for Gamma radiation measurement.
This is used as a detector probe for Beta-Gamma contamination monitors manufactured by NUCLEONIX SYSTEMS. It is used in both bench model Contamination Monitor CM712 and Portable Model Digital Contamination Monitor