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Abstract
Thermoluminescence (TL) mechanisms of neutron-irradiated α-Al2O3 at 20 K is reported. The TL glow curves of neutron-irradiated and γ-ray-irradiated α-Al2O3 were observed. The TL emission bands near 340, 430, 530 and 694 nm were observed in the neutron-irradiated α-Al2O3. The γ-ray-irradiated α-Al2O3 only showed the TL emission line nearly at 694 nm, corresponding to the R lines of α-Al2O3:Cr3+. Therefore, the first three emission bands are related to the atomic displacement defects as F-type centers caused by neutron irradiation.
Acknowledgements
The authors wish to thank the staff of Kyoto University Research Reactor Institute for their technical help. This research is supported by the Ministry of Education, Culture, Sports, Science and Technology (MEXT), Japan.