SYMPOSIA PAPER Published: 01 January 1992
STP17910S

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

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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.

Author Information

Shikama, T
Institute for Materials Research, Tohoku University, Oarai Ibaraki Ken, Japan
Narui, M
Institute for Materials Research, Tohoku University, Oarai Ibaraki Ken, Japan
Ochiai, A
Institute for Materials Research, Tohoku University, Oarai Ibaraki Ken, Japan
Kayano, H
Institute for Materials Research, Tohoku University, Oarai Ibaraki Ken, Japan
Endo, Y
Oarai Researchment Establishment, Japan Atomic Research Institute, Oarai Ibaraki Ken, Japan
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Details
Developed by Committee: E10
Pages: 776–784
DOI: 10.1520/STP17910S
ISBN-EB: 978-0-8031-5187-1
ISBN-13: 978-0-8031-1477-7