It's based on scintillation crystals which generate a photon when it's atom is hit with gamma energy. Photomultiplyer tube then detects and amplifies single photon and converts to electrical signal.
I found some plans how to make one (need a scintillation crystal and photomultiplier) and already ordered Ludlum Model 3 analog ratemeter, but eventually I want to add digital output to log data... So if anyone had any experience with these, and tips or advise will be appreciated!
