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 8000 spectrometer hardware, spectra are on the photos. 

Want to build a gamma spectrometer? This is your chance! 

Actual PMTs may slightly differ from photos.

Check out my other lots, I hope you will find something interesting!

Fell free to ask questions.