Abstract
The physics of true coincidence production by the Cs-137 source is elaborated. When the single-photon emitting Cs-137 source is sandwiched between two detectors of a coincidence system, the scattering of 662 keV gamma-rays between the detectors (“cross-talk”) will result in true coincidence events. The results of Ermis et al. (2014) on that issue are critically analyzed. Our Geant-4 simulations did not support most of the results of this work.Thus, the possibility of coincidence time resolution improvement by the Cs-137 source is challenged.
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