1. Comparison between fast neutron and gamma irradiation of optical fibres
- Author
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B. Glessner, O. Kohn, H. Henschel, J. Rosenkranz, S. Metzger, B.R.L. Siebert, Hans Ulrich Schmidt, W. Lennartz, and Publica
- Subjects
Nuclear and High Energy Physics ,Optical fiber ,Materials science ,optical fibers ,business.industry ,gamma radiation ,Gamma ray ,Analytical chemistry ,Fluence ,radiation induced loss ,law.invention ,radiation ,Recoil ,Optics ,Nuclear Energy and Engineering ,law ,Neutron ,fast neutrons ,Irradiation ,Electrical and Electronic Engineering ,Neutron irradiation ,business ,Gamma irradiation - Abstract
A variety of undoped multimode step-index fibres and Ge-doped single mode and graded index fibres is irradiated by 14 MeV neutrons and /sup 60/Co gamma rays up to the same total dose. Radiation-induced loss and breaking stress are measured. The loss induced during gamma irradiation of Ge-doped fibres is about 2.5 times higher than during neutron irradiation with the same dose rate, up to a fluence of about 3/spl times/10/sup 12/ cm/sup -2/ (14 MeV). This loss ratio decreases to /spl les/2.0 after about 10/sup 13/ cm/sup -2/ (14 MeV). Monte Carlo calculations of the dose enhancement as caused by fast recoil protons out of the H-containing acrylate coating are confirmed experimentally. 14 MeV neutron irradiation up to /spl les/10/sup 13/ cm/sup -2/ seems to decrease fibre breaking stress by 3-4%, whereas /sup 60/Co gamma irradiation up to the same total dose has no effect.
- Published
- 1998