Abstract
Constructional details are given of a complete Geiger-Müller counting system consisting of a stabilized high voltage supply, Neher-Harper coupling circuit and vacuum-tube scale-of-eight feeding a Cenco counter stage. The system is entirely a.c. operated. Its resolution time of 6.5×10−6 second allows it to follow the G-M circuit without counting losses. The counting losses in the Cenco counter stage are negligible for random input rates to the system up to 20,000–30,000 counts a minute.

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