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Optical fibers are being considered for uses where they will be subjected to high radiation fields and elevated temperatures simultaneously. This paper describes a fiber which is aluminum jacketed, and may hence be heated to 550Â°C. When heated to 550Â°C and subjected to 30 Krads of gamma rays from 60Co, the fiber sustained 1/10 the normal room temperature damage. Thermolumnescence testing and spectral absorption studies indicate that even at 550Â°C there are many deep lying traps still present in the silica which serve as signal absorption centers.