| in a gamma ray spectrum, peaks due to: 1) pair production in the detector and escape, from the detector, of one or two photons of 511 keV resulting from annihilation 2) photoelectric effect in the detector and escape from the detector, of the X-ray photon emitted as a result of the photoelectric effect (X-ray escape peak)
Note 1 to entry: This entry was numbered 394-39-26 in IEC 60050-394:2007.
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