Afterpulse Time Spectrum Measurement of RCA 8850 Photomultiplier

The photomultiplier dark pulse-height, signal induced pulse-height, and afterpulse time spectra have been measured on three RCA 8850 52 mm-diameter photomultipliers. The first dynode of this photomultiplier has a cesium activated, gallium-phosphide secondary emitting surface. Measurement techniques and the measuring systems are described in detail.