Abstract

A simple system is described that allows the study of the nonuniformity of the quantum efficiency of a photomultiplier as a function of the angle of incidence of the light for a variety of wavelengths. Results are presented for the EMI 9956QQB and discussed for both this model and the 9956QB photomultipliers, tubes frequently used in gas proportional scintillation counters. It is shown that the photocathode uniformity is better for shorter wavelengths and for incidence angles which are not too large. >

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