Thermoluminescence of α-Al 2O 3 by neutron irradiation at low temperature

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.