1990 Fiscal Year Final Research Report Summary
Studies on Radiation Response of Optical Fibers
| Project/Area Number |
01580228
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| Research Category |
Grant-in-Aid for General Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Research Field |
Nuclear engineering
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| Research Institution | Osaka University |
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Principal Investigator |
IIDA Toshiyuki Osaka University, Faculty of Engineering, Research Associate, 工学部, 助手 (60115988)
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| Project Period (FY) |
1989 – 1990
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| Keywords | Radiation resistant optical fiber / Radiation response / Induced-loss / Pure silica core optical fiber / Charge trap level / Dose / Color center / Damage mechanism |
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| Research Abstract |
Various radiation-resistant optical fibers were irradiated with 14-MeV neutrons, thermal neutrons ^<60>Co gamma-rays. The induced loss in light transmission was measured in-situ during irradiation. The radiation response of optical fibers was approximately explained by using an equation for the density of color centers related to charge trap levels in optical fibers under irradiation. Also experimental results showed there was not large difference in effects between 14-MeV neutron and ^<60>Co gamma-ray irradiations. This means that radiation response of optical fibers is influenced predominately by ionization effects closely related with dose, rather than by structural changes due to neutron displacement effects. However, response of B-doped optical fibers to thermal neutrons was different from that to other radiations. There was also large difference in the induced loss rate between thermal neutron and other irradiations. The ^<10>B (n, alpha) ^7Li reaction affects light transmission in not whole but specialized region of the optical fibers. The difference may be explained by the microscopic examination of the damage mechanism of optical fibers. This is not discussed in the present study but is an important subject in the future.
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