Abstract

Pure -Silica -Core Optical FibersB. L. Pruett, R. T. Peterson, and D. E. SmithLawrence Livermore National Laboratory, University of CaliforniaP.O. Box 808, Livermore, California 94550L. D. Looney and R. N. Shelton, Jr.Los Alamos National Laboratory, Los Alamos, New Mexico 87545AbstractWe have determined experimentally the absolute gamma -ray to Cerenkov -light conversion efficiency for pure -silica -core opticalfibers in the vicinity of metallic Compton- converter slabs. To measure the energy dependence of this process, we used 60Co and 24Naradiation sources. The results show how the conversion efficiency varies with Compton- converter material, thickness, angle of thefiber, and fiber -converter distance. We also performed computer calculations of conversion efficiency. This method employs anelectron -photon transport code named SANDYL together with analytical calculations of Cerenkov -light generation. We compare theresults of these calculations with experimental results.IntroductionPure -silica -core optical fibers are used by the Lawrence Livermore National Laboratory (LLNL) and the Los Alamos NationalLaboratory (LANL) in high- bandwidth analog diagnostic systems for gamma rays, in the Nuclear Testing Program at the Nevada Test

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