Experimental performance assessment of currently available optical fibers in nuclear reactor radiation environments

The performance of currently available fiber optics under radiation conditions similar to those encountered in nuclear power plants was assessed. The fiber tested were selected to span the types likely to be used in radiation environments. The experimental measurement program spanned the range of fiber types, radiation environments, temperatures, and light powers expected to be used in nuclear power plants. Several conclusions have resulted from this research. First and foremost, optical fibers are currently available which will continue to perform in nuclear reactor environments. Secondly, pure silica core fibers show the least radiation induced damage in both mixed neutron/gamma and gamma only environments. Finally, some fibers fluoresce enough under irradiation to obscure low strength signals.