Glasses of the following composition 45Na<sub>2</sub>O•(55 - x)P<sub>2</sub>O<sub>5</sub>•xNb<sub>2</sub>O<sub>5</sub> and 50Na<sub>2</sub>O•(50 - x)P<sub>2</sub>O<sub>5</sub>•xNb<sub>2</sub>O<sub>5</sub> are studied. It is found that under the influence of γ-radiation the glass color changes. Optical absorption spectra, photoluminescence spectra, Rayleigh and Mandel'shtam - Brillouin scattering (RMBS) spectra are investigated in dependence of glass composition, europium concentration, thermal treatment duration and radiation dose. Effect of secondary thermal
treatment is studied on the base of 45Na<sub>2</sub>O•25P<sub>2</sub>O<sub>5</sub>•30Nb<sub>2</sub>O<sub>5</sub> doped with 1 mol.% Eu<sub>2</sub>O<sub>3</sub>. It is found that intensity of
photoluminescence gives rise and decay time as well under thermal treatment at the temperature exceeding transition
temperature by 50 degrees. RMBS spectra of glasses after thermal treatment demonstrate decrease of scattering intensity
while Eu<sub>2</sub>O<sub>3</sub> being doped. Effects obtained are accounted for europium ion local symmetry changes.
The structural microinhomogeneity of EuF<sub>3</sub> doped fluorophosphate glasses is studied to elucidate the influence of the Eu<sup>3+</sup> ion environment on Rayleigh scattering. The measurements of Rayleigh and Mandelstam-Brillouin scattering, small-angle x-ray scattering, y-ray induced optical absorption, and fluorescence are used. It is shown that the introduction of Eu<sup>3+</sup> ions into fluorophosphate glass with a small amount of phosphate decreases the Landau-Placzek ratio. Based on the analysis of the optical absorption and x-ray scattering spectra, the grouping of the Eu<sup>3+</sup> ions with the phosphate groups is demonstrated. Applying the capture volume model, the maximum concentration of the Eu<sup>3+</sup> ions in the phosphate environment is estimated to be 1.05x10<sup>18</sup>cm<sup>-3</sup>. It is found that the capture volumes of the Eu<sup>3+</sup> located in the phosphate and mixed environment differ by two orders of magnitude, which approves the discussion in terms of the doped ion segregation.