This implementation demonstrates three-photon decay in Geant4, improving positronium imaging in PET and materials science. It enhances radiation transport modeling and event generation accuracy.
We present a complete implementation of ortho-positronium (o-Ps) three-photon decay within Geant4's modular architecture. Unlike previous limited approaches, our PositroniumDecayAction class provides full event generation following the Ore-Powell distribution with exact energy-momentum conservation. Validation with 105 events yields ⟨x1⟩ = 0.660 ± 0.243 and ⟨x2⟩ = 0.598 ± 0.258, matching quantum electrodynamics predictions. This implementation enables realistic simulation of positronium lifetime imaging (PLI) in PET scanners and positron annihilation lifetime spectroscopy (PALS) for nanomaterials characterization, addressing critical gaps in radiation transport modeling.
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Frederico R. Baptista (2025) studied this question.
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