Hey everyone, I need to be able to be able to explain how a gamma spectrometer (NaI scintillator) can determine the energy of a given gamma ray (or more particularly, determines the effective dose rate, but that shouldn't be to hard once I figure out how to get the energy). The problem, as far as I can see is that 3 processes govern the device: photoelectric effect, compton effect, and pair production. Only in the photoelectric effect is (close to) the full amount of energy transfered from the gamma ray into the electron. In the compton effect, some particles wont even be measured at all. Any thoughts? Thanks!