Structure and optical properties of MoO3-doped lead borate glasses which contain high PbO content (6, 7 and 8%) have been studied using Fourier transform infrared (FTIR) and ultraviolet–visible (UV–VIS) spectroscopic tools. FTIR spectra reveal absorption bands which are characteristic for various structural units of borate network, mainly BO3triangles and BO4tetrahedra, in addition to the PbOn(wheren = 3 and/or 4) structural units. UV–VIS optical absorption spectra reveal broad intense charge transfer UV bands due to Pbions in the range 32–385 nm. Within this range, molybdenum ions, preferably Moand Mo, can interfere at about 36–385 nm. Additionally, molybdenum ions give a weak visible band at about 85–86 nm. The optical absorption spectra of the studied glasses show marked resistance to successive gamma irradiation up to 5 Mrad. This shielding behavior can be related to the present high content of the high atomic mass Pbions. Changes in the atomic structure before and after gamma irradiation are described and explained.FTIR and UV–VIS optical absorption spectra of MoO
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