Transistorized Radiation Monitors

The advantages of transistors over vacuum tubes in radiation instruments have long been realized but a somewhat different approach to circuit design must be followed in developing transistor instruments, as compared with that used in vacuum tube circuits, and this seems to have discouraged many from developing such circuits. The purpose of this paper is to describe in some detail the design principles included in some instruments developed at Chalk River in the past two years. Transistor high-voltage supplies, ratemeters, and pulse amplifiers are discussed and two instruments tusing these elements are described.