[en] A study has been made of the X-ray luminescence patterns of Ce³⁺ and Tb³⁺ ions in model glasses with the composition (mole %) 22Na₂O·3CaO·75SiO₂ synthesized under different redox conditions. It was established that the intensity of this luminescence and its dose and concentration function were strongly affected by radiation-stimulated overcharging of these dopants and electron capture by the precursors of electron color centers stable at the temperature employed. An especially large part was played by such impurity electron acceptors as Fe³⁺ and Ce⁴⁺ ions, which reduced the efficiency of Tb³⁺ and Ce³⁺ X-ray luminescence by a factor of 2 or more in comparison with that for glasses having the minimum possible Fe³⁺ or Ce⁴⁺ concentration. As the dose increased, the Ce⁴⁺ or Fe³⁺ concentration in glasses containing these ions fell as a result of radiation-induced reduction, and a greater role was played by recombination of the electrons newly generated in the glass matrix with the accumulated overcharged (Ce³⁺)⁺ or (Tb³⁺)⁺ activator centers. This led to a rise in Ce³⁺ or Tb³⁺ X-ray luminescence intensity during irradiation; the increment could be several times the initial intensity. This paper discusses possible mechanisms for transfer of excitation energy from the matrix to dopant ions and the role in this transmission of charge carriers formed in the glass matrix under the action of X-rays