Escape Peak

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Peak, which appears in the spectrum at a position which is 511 keV (single escape) or 1022 keV (double escape) lower as the real photon energy. Escape peaks appear mostly at high photon energies (>1.5 MeV) and small detectors. They are caused by positron annihilation photons leaving the detector when a photon was absorbed by a pair production process.

Source: Dr. Joerg Brutscher, Identify manual

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