Sm-, Gd-codoping effect on the structural modifications of beta-irradiated aluminoborosilicate glasses has been studied by electron paramagnetic resonance (EPR) and Raman spectroscopy. The EPR spectra showed that the relative amount of Gd³⁺ ions occupying network former positions (Gd_[n.f.]³⁺) follows a non-linear behaviour as a function of the Sm/Gd ratio. This suggests that codoping favors occupation by Gd³⁺ ions of the network former rather than modifier positions in aluminoborosilicate glasses. We have observed the appearance of a superhyperfine structure of EPR lines attributed to boron oxygen hole centers (BOHC) with increasing Sm/Gd ratio. This suggests that Gd³⁺ ions are diluted in the vicinity of the BOHC defects. The concentration of the defects created by irradiation reveals a non-linear dependence on Sm, Gd-codoping for the lowest irradiation dose (10⁵ Gy). Therefore, codoping also affects the defect creation processes at least at the lowest irradiation dose. Raman spectroscopy measurements suggest that the irradiation-induced structural changes depend in a non-linear way on the Sm/Gd ratio. In fact, the shift of the Si-O-Si bending vibration modes reveals a clear minimum for the samples containing equal amounts of Sm and Gd (1 : 1) in the investigated glasses. PACS: 61.43.Fs, 76.30.-v, 78.30.Ly

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