The Development of Photomultipliers for Scintillation Counting

The structures and characteristics of the new line of photomuliptliers made by CBS Laboratories will be described. Some recent results on the investigation of pulse-height shift are also presented. The development of photomultiplier tubes for the detection of low-level radioactivity is discussed. This involves using tube materials with a minimum of radioactive contamination for such applications as whole-body counting. For low-energy nuclear radiation detection (e.g., detection of tritium) a tube has been developed which eliminates thermionic emission from the unused portions of the cathode which have been deposited on the sidewalls of the tube.