Measurement of Resolving Times with the Fast RCA C-70045 Photomultipliers

This work deals with tests of the RCA C-70045 photomultipliers in a delayed coincidence apparatus. Illuminating the photocathode of the photomultiplier with constant height light pulses, resolving time measurements are performed. Prompt resolution curves are then measured using two photomultipliers of this type associated with two plastic scintillators. A time resolution of 1.85×1O-10s (f.w. h.m.) was obtained with Co60.