The physics of the detectors described by samzenpus is a bit wonky. Electron/positron pair production has nothing to do with the photoelectric effect. The first is a result of a high energy gamma ray photon interacting with an atomic nucleus, the second is a photon interacting with an atom's electrons.
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The physics of the detectors described by samzenpus is a bit wonky. Electron/positron pair production has nothing to do with the photoelectric effect. The first is a result of a high energy gamma ray photon interacting with an atomic nucleus, the second is a photon interacting with an atom's electrons.