STP1125

    Electrical Conductivity of Single Crystal α-Alumina under Neutron and γ-Ray Irradiation

    Published: Jan 1992


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    Abstract

    Recent advances in nuclear-fusion-reactor development renewed interest in the well-known phenomenon called radiation-induced conductivity (RIC). RIC involves an increase of electrical conductivity of ceramic insulators under exposure to ionizing irradiation. We tried to measure RIC of single crystal a-alumina in the fission reactor JMTR. The a-alumina was encapsulated in a well electrically insulated casing and was exposed to fast neutron irradiation up to 3.4 × 1017 n/m2 s and to γ-ray irradiation up to 1.5 × 104 Gy/s. The measured RIC was 0.6 to 1.5 × 10-5 (ohm m)-1 at the maximum exposure rate. Temperature dependence of the RIC was not observed in the present experiment, and the RIC was found to depend on the 0.75th power of reactor power.

    Keywords:

    ceramic insulator, α-alumina, electrical conductivity, radiation-induced conductivity, reactor irradiation


    Author Information:

    Shikama, T
    Institute for Materials Research, Tohoku University, Oarai Ibaraki Ken,

    Narui, M
    Institute for Materials Research, Tohoku University, Oarai Ibaraki Ken,

    Ochiai, A
    Institute for Materials Research, Tohoku University, Oarai Ibaraki Ken,

    Kayano, H
    Institute for Materials Research, Tohoku University, Oarai Ibaraki Ken,

    Endo, Y
    Oarai Researchment Establishment, Japan Atomic Research Institute, Oarai Ibaraki Ken,


    Paper ID: STP17910S

    Committee/Subcommittee: E10.08

    DOI: 10.1520/STP17910S


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