Hamamatsu R1847-17 2" (50.8 mm)Photomultiplier tube with Voltage divider, carefully pulled from working environment and professianally tested using LaBr3(Ce) and NaI(Tl) scintillation crystals and Cs137 radioactive source. Test performed using GS-MAX 14 spectrometer hardware, spectra are on the photos. Built-in LED for self-check.

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