Optical and infrared absorption spectra of undoped ternary
silicate and CoO doped glasses were measured before and after successive gamma
ray irradiation. The results obtained revealed the existence of cobalt ions
mainly in tetrahedral coordination in such host glasses. The radiation-induced
defects created by gamma irradiation are related to intrinsic effect of the
glass constituents and extrinsic effect due to the cobalt ions. The response of
the glass to irradiation and the growth rate of colour center formation are
related to the equilibrium between the formation and annihilation processes of
induced colour centers and the saturation or equilibrium state reached by
successive irradiation.
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