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at high gamma-ray energies, escape of annihilation radiation following pair production within the detector is very significant

pair production process consists of creating an electron-positron pair at the site of the original gamma-ray interaction

kinetic energy of both particles is expended in creating charge carriers, but the positron near the end of its track will annihilate and create two 0.511 MeV annihilation photons

in germanium detectors there is a high probability that one or both of these photons will escape

Gamma-Ray Spectroscopy with Germanium Detectors - Response Function

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