Abstract
The electrical conductivity change caused by γ-ray irradiation in the temperature range from 450 to 1050°C was studied by measurements using a two-terminal ac method in pure and 1 mol% Cr2O3-doped single crystal Al2O3. The conductivity in pure Al2O3 was gradually increased by γ-ray irradiation between 650 and 750°C by about 10% of the conductivity in the unirradiated sample at a dose of 5×104 Gy. A conductivity decrease was observed during irradiation at 850°C. Little conductivity change was found during irradiation above 950°C, After irradiation, the increased and decreased conductivity by γ-ray irradiation was recovered by annealing within several hours at the temperatures. In the Cr2O3-doped Al2O3, little conductivity change was observed during γ-ray irradiation above 850°C, while slight conductivity decrease was found during 750°C irradiation.
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