Abstract:
The large core pure quartz fiber with double-clad offers an attractive alternative to transmit light pulse signal in irradiation fields. But fibers can be induced to produce luminescence and absorption by irradiation, and this makes the real signal deteriorated. In order to evaluate these effects, the fibers of core diameters of 0.2, 0.4 and 0.6 mm were researched in
60Co source with irradiation dosage rate of 0.053 6 Gy/s. The experimental results show that the irradiation induced loss decreases with core diameter increasing; the additional loss is not in direct proportion to the amount of total dosage; with total dosage increasing, the additional loss increases slowly and gradually reaches stable value; the amounts of illumination and loss at short wavelength are more than those at long wavelength in 300-600 nm wavelength, and luminous intensity is 10
-13 W•s/(Gy•m). In addition, the recovery of these fibers is observed.
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