SEDL / STP / STP956-EB / STP25680S

Photobleaching Effects on Radiation-Induced Loss for Silica Glass Image Fiber

Hayashi, S
General manager and senior engineer, Power Reactor and Nuclear Fuel Development Corporation, Naka-Gun, Ibaraki-Ken,

Wada, Y
General manager and senior engineer, Power Reactor and Nuclear Fuel Development Corporation, Naka-Gun, Ibaraki-Ken,

Chigusa, Y
Engineer, engineer, chief research associate, senior engineer, and engineer, Sumitomo Electric Industries, Ltd., Totsika-Ku, Yokohama,

Fujiwara, K
Engineer, engineer, chief research associate, senior engineer, and engineer, Sumitomo Electric Industries, Ltd., Totsika-Ku, Yokohama,

Hattori, Y
Engineer, engineer, chief research associate, senior engineer, and engineer, Sumitomo Electric Industries, Ltd., Totsika-Ku, Yokohama,

Matsuda, Y
Engineer, engineer, chief research associate, senior engineer, and engineer, Sumitomo Electric Industries, Ltd., Totsika-Ku, Yokohama,

Pages: 7    Published: Jan 1987

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Abstract

The photobleaching effect (annealing effect on light absorption by light energy) on silica glass image fiber was investigated. We evaluated photobleaching characteristics using He-Cd laser, a xenon lamp, and a D² lamp as photobleaching light sources. Fibers were irradiated at two levels of dosage, 300 rad/h and 10⁴ rad/h. The thermal effect on photobleaching was also evaluated by comparing the effect at 28°C and that at 70°C. The investigations demonstrated the superiority of the xenon lamp and thermal dependency of photobleaching. Furthermore through xenon lamp bleaching, we have succeeded in elongating the usable life span of image fiber in a 300-rad/h gammaray environment to more than five times that for nonbleached fiber.