[en] Experimental data on the output of proton photoproduction with kinetic energy of 80-290 MeV at irradiation of ¹²C, ⁶³Cu, ²⁰⁸Pb, by breakage γ-quantum with maximum energy of 4.5 GeV are considered. Inclusive reaction γ-A → p+A' was investigated on the G-3 beam of electron synchrotrone. The mass spectra from the target ¹²C with the registration angle of 90 deg and various thicknesses and combinations of retarding substance are presented. Invariant sections are presented in the table and graphically, depending on the registration angle for energy values of 80, 100, 136, 180, 208, 290 MeV protons. The character of angular dependences is the same for a wider change interval of atom nuclear number of the target 12 (<=) A (<=) 208 in the region of angles (>=) 140 deg (a tendency for saturation is observed)