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An interferometric method is discussed which enables changes in refractive index of irradiated optical fibers to be determined. The method was used to determine the changes of step-index fibers irradiated with 1 krad of gamma rays from a (60)Co source. In one case, relative changes in the core and cladding radii of 3.9% and 1.8%, respectively, and in the core and cladding refractive indices of 2.8% and 2.26%, respectively, have been determined.
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Bertolotti et al. (1980) studied this question.
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