* Pair production with actual angular distribution of electrons and positrons. * Landau-Pomeranchuk-Migdal pair production suppression effect [Lan53, Lan53a, Mig56, Mig57] * Compton effect with Doppler broadening using a fit of the Compton profiles [Rib75, Big75], and account for atomic bonds through use of inelastic Hartree-Fock form factors. * Photoelectric effect with actual photoelectron angular distribution according to the fully relativistic theory of Sauter [Sau31]. Interactions sampled separately for each component element and for each edge. The edge fine structure is taken into account. Parameterisations/tabulations for photoelectric cross sections including all known edges up to Z=100 and down to a few eV. Optional emission of fluorescence photons and approximate treatment of Auger electrons for all K and most L lines. * Rayleigh effect. * Photon polarisation taken into account for Compton, Rayleigh and Photoelectric effects. * Photohadron production: - Vector Meson Dominance Model (Ranft [Ran87b]), modified and improved (Ferrari-Sala) using PEANUT below 770 MeV [Fas95]. - Quasideuteron interactions - Giant Dipole ResonanceNote:the present lowest transport limit for photons is 100 eV. However, fluorescence emission may be underestimated at energies lower than the K-edge in high-Z materials, because of lack of Coster-Kronig effect. The mimimum recommended energy for PRIMARY photons is about 1 keV.
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