The article provides estimates and measurements of the levels of induced radioactivity from the technological units of the accelerator-recuperator of Novosibirsk powerful FEL. FEL operates in three modes when the kinetic energy of electrons reaches 12, 20, and 40 MeV. In the range of these energies lies a giant dipole resonance. For control, copper and stainless steel samples were irradiated. Measurements and calculations allow us to estimate the levels of induced radioactivity and the times of degradation of materials (products) under the influence of radiation.