Kinetics and dosimetric features of secondary thermoluminescence in carbon-doped aluminium oxide

Carbon-doped aluminium oxide has some unstable electron traps whose presence is revealed as luminescence at temperatures close to ambient. Thermoluminescence of such a secondary glow peak at 46 °C has been studied for heating at 1.0 °C s−1. The study showed that the peak follows first order kinetics and has an activation energy of about 0.7 eV independent of irradiation. Its dose response is linear at low dose with a supralinearity index equal to 1 but suffers from fading between irradiation and measurement with a half-life of about 120 s. The luminescence is attributed to the 3P→1S transition at an F-centre.