Absorption spectra of gamma-irradiation TM-doped cabal glasses

The UV–visible absorption spectra of nominally pure and transition metals-doped (Ti → Cu 0.1%) cabal glasses were measured from 200 to 1000 nm before and after successive gamma irradiation. The absorption spectra of the undoped glass exhibit charge transfer bands due to iron trace impurities which eventually affect the induced absorption due to some transition metals and that due to the host base glass in the UV region. The intensity of the radiation-induced bands depends on the number of intrinsic defects and the rate of formation of the different induced color centers. Also, the possible photochemical processes due to the effect of radiation on the transition metal ions are observed to affect the overall induced spectra. The growth behavior of the repetitive induced bands in the undoped and TM-doped glasses reveals a fast increase at first dose and the growth rate decreases or approaches saturation afterwards and different possible assumptions are given to interpret this behavior.