Abstract
Assessing the behavior of borosilicate glass used for nuclear waste immobilization under irradiation is essential for determining the long-term behavior of the high-level waste. In this work, the γ irradiation induced structural properties of the borosilicate glass have been studied via ultraviolet–visible (UV–Vis) spectroscopy and electron paramagnetic resonance (EPR) spectroscopy. The optical band gap (Eg) and the Urbach energy (Eu) deduced from the UV–Vis spectra of borosilicate glasses. The Eg decreased and the Eu increased with the increase of absorbed dose, which indicated the increase of non-bridging oxygen and disorder in the glass network. The EPR results revealed that there formed the following paramagnetic defects: hole center associated with boron (BOHC), hole centers near alkaline ions (HC1 center), E′ centers (Si), peroxy radical (Oxy defect), non-bridging oxygen hole centers (NBOHC), BO3− center, Si − BOHC (BOSi) and B–O–B–iso center (HOHOBOH-O·-BOHOH).
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