Abstract
We propose, and verify in the case of a Ge-doped-silica-core optical fiber, a general explanation for the power-law dependencies on dose frequently observed for the concentrations of radiation-induced defect centers in insulating glasses. This insight permits detailed prediction of the postirradiation recovery curves, given just the empirical exponent of the power law, 0<f<1, and the experimental irradiation time, t irrad . The time constant of the recovery is given by t irrad /(1-f), independent of the order of the kinetics. We establish a microscopic model (radiolytic oxygen molecules) for the γ-ray-induced absorption at 1-3 μm in our test fibers and infer a diffusion-limited bimolecular recombination process
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