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The gamma-ray-radiation -induced damage to silicon single -mode fiber is reported. The immediate radiation-induced attenuation of the 10m fiber under total dose 10 4 rad is 8.98dB/km, which was tolerable. Some disastrous attenuation was found a half-hour later, which rapidly increased to 642.53dB/km. No obvious spectral variation after radiation was found, except for the decreases of the spectrum...
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