2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/48081I consider the problem of the evaluation of the orthopositronium decay rate, including second order radiative corrections. I present a brief theoretical discussion of this problem and a review of the results available in literature, and, then, I analyze some $O(α^2)$ annihilation-type contributions, recently computed.Extended version of the talk given at the International Workshop "HADRONIC ATOMS AND POSITRONIUM IN THE STANDARD MODEL", DUBNA, 26-31 MAY 1998 11 pages, latex, 4 figuresHigh Energy Physics - PhenomenologyHigh Energy Physics - ExperimentAtomic Physicstext