Cerenkov radiation is generated as an unwanted background when optical fibers carrying signals pass through radiation fields. The angular dependence of the intensity of Cerenkov radiation transmitted in silica-core fibers was measured using 6 and 12 MeV electron beams from a Varian Clinac accelerator. These confirmed theoretical predictions that the angular variation of Cerenkov radiation transmitted along optical fibers depends only on the refractive index difference (DELTA)n between the core and the cladding, and that the peak intensity is proportional to the cube of the fiber core radius.
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