Electron-multiplication process within the photomultiplier. Figure 2 offers a visual representation of these six steps. Electron produced in scintillator . Light travels through light pipe, to the photocathode. Secondary electrons produced within photocathode.
Secondary electrons go to the photo-multiplier tube.
The output of a detector is called a pulse-height spectrum. Figures 3 and 4 offers a comparison of sprectra from two different detectors with the same source. Both spectra represent the collection of 1.37 and 2.75 MeV gamma rays emitted from Sodium-24. Several peaks that have been labeled in Figures 3 and 4. Introduction to the Concept of Resolution Resolution is defined both mathematically and pictorially.