Evaluation of new photonis XP1472 nine-channel photomultiplier

The performance of a new Photonis XP1472 nine-channel photomultiplier (PMT) was studied with the main emphasis to the photoelectron numbers and photoelectron collection efficiency, as measured with a 10 mm diameter NaI(Tl) crystal coupled to the separate channels. Simultaneously, energy resolution and crosstalk were measured for all channels with a /sup 137/Cs source. Time jitter and time resolution for an LSO crystal coupled to the different channels were measured for 511keV annihilation quanta and compared to those measured earlier with XP2020Q PMTs. The studies confirmed high photoelectron collection efficiency in the PMT due to a new design of the input focalization system.