Optical properties in fibers during irradiation in a fission reactor

• Published in: Journal of nuclear materials Vol. 225; no. 1-3; pp. 324 - 327
• Main Authors: Shikama, T., Kakuta, T., Narui, M., Sagawa, T., Kayano, H.
• Format: Journal Article Conference Proceeding
• Language: English
• Published: Amsterdam Elsevier B.V 01.08.1995; Elsevier
• Subjects: Applied sciences; Energy; Energy. Thermal use of fuels; Exact sciences and technology; Fission nuclear power plants; Installations for energy generation and conversion: thermal and electrical energy; Optical fibers; Optical signal; Radiation effects; Optical properties; Fast neutron; Nuclear reactors; Radiation damage; Fission reactions
• ISSN: 0022-3115; 1873-4820
• DOI: 10.1016/0022-3115(94)00688-1

The effects of irradiation on the performance of optical fibers with silica core were examined during irradiation in a fission reactor, JMTR. The fibers performed well in terms of their radiation characteristics up to the fast neutron fluence of 1.06 × 10 20 n/cm 2 and the gamma ray dose rate of 4.3 × 10 9 Gy at 460 K. Three kinds of optical radiation induced by the reactor irradiation were observed during irradiation. Origins of these optical radiations were studied. Broad optical radiations centered at 0.45 and 0.73 μm are thought to be Cherenkov radiation. The sharp optical radiation at 1.27 μm was thought to be generated in the silica core by the gamma-ray irradiations in the reactor.