LYSO Crystal Stack with PMT XP3312

[DL8BCN]

Hello, I have been experimenting for some time with a LYSO stack 5x5 made of 4mm rods that I have connected to a PMT XP3312. Unfortunately I can't get any usable impulses, only the background radiation from the crystals. Tomorrow I will send more information on the topic. Greetings, Rainer

[Madmax]

LYSO have intrinsic activity around 50-100 cps per one cubic cm of crystal, it's ~10 times higher than average background. LYSO cannot be used for work at near-background levels.