2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/40195The bremsstrahlung of an electron and $e^{-}e^{+}$-pair creation by a photon in a medium is considered in high-energy region, where influence of the multiple scattering on the processes (the Landau-Pomeranchuk-Migdal (LPM) effect) becomes essential. The integral characteristics: the radiation length and the total probability of radiation and pair photoproduction are analyzed under influence of the LPM effect.Talk given at the Quantum Aspects of Beam Physics 2000 Workshop, Capri, Italy, Oct.2000, 10 pages, 2 figuresHigh Energy Physics - Phenomenologytext