Abstract
The effect of gamma-irradiation in the dose range of 5 kGy up to 25 kGy on the optical absorption spectra of 50PbO-50P(2)O(5) glasses is reported. The spectral absorption of these glasses before and after gamma-irradiation was measured in the spectral range of 300-900 nm at room temperature. The radiation induced absorption in this spectral range shown to consist of two bands centered approximately at 545 nm and 730 nm. The fundamental absorption edge shifts generally to lower energies with increasing gamma-irradiation dose up to 25 kGy in this glass sample. The intensity of the induced absorption hands increases linearly with increasing gamma-irradiation dose. The higher energy band (HEB) may be due to a hole in a singly bonded non-bridging oxygen distant from a modifier cation, while the lower energy band (LEB) is also due to a hole in similar oxygen which is interacting with a neighboring cation. (C) 2008 Elsevier B.V. All rights reserved.