Progress on Photomultipliers and Image Intensifiers at EMI Electronics Ltd.

This paper reviews recent work at E.M.I. on photomultiplier tubes. Dark current measurements by various techniques are presented, including data on tubes with high quantum efficiency and minimum thermionic emission suitable for low energy scintillation counting. Mention is made of a new fast tube, a small tube, and modified ion detectors. Two four-stage image intensifiers are described.