The application of transistors to the trigger, ratemeter and power-supply circuits of radiation monitors

The paper outlines the general requirements and the conditions of use of radiation monitors employed in ¿- and ß-ray survey in connection with geological prospecting. In such instruments, it has been usual to employ either filament valves or cold-cathode valves in amplifier and trigger circuits, and vibrators, filament-valve oscillators or high-voltage battery stacks in the power supplies. Arguments leading to the transistor as the preferable component in all cases are given, and typical transistor circuits are discussed in some detail. Both point-contact and junction transistors are discussed, and the superiority of the junction-type circuits for this type of application is demonstrated.