The R12699 PMT reaches ~0.08 mBq/PMT 60Co and ~0.06 mBq/PMT 238U late chain radioactivity, 15-fold lower than PandaX-4T's R11410, with cryogenic gain of 4.23e6 and 2.5 Hz dark count rate.
Qian, et al., Low radioactive material screening and background control for the PandaX-4T experiment, JHEP 06 (2022) 147
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A Novel Low-Background Photomultiplier Tube Developed for Xenon Based Detectors
The R12699 PMT reaches ~0.08 mBq/PMT 60Co and ~0.06 mBq/PMT 238U late chain radioactivity, 15-fold lower than PandaX-4T's R11410, with cryogenic gain of 4.23e6 and 2.5 Hz dark count rate.