Electron immigration from shallow traps to deep traps by tunnel mechanism on Seydişehir aluminas

In this study, the fading mechanism of Seydişehir alumina in Turkey, which is considered to be used for radiation dosimetric purposes, was investigated. The materials were first exposed to beta radiation and then stored in dark and dry ambient conditions at room temperature (RT) at previously desired storage periods. It was observed that the glow curve of Seydişehir alumina consists of four glow peaks between RT and 400 °C. The glow peaks (peaks 1, 2 and 3) between room temperature and 250 °C possessed very high levels of anomalous fading. However, the intensity of new glow peak at around 378 °C is highly increased with time. As a result of the experimental studies, it was concluded that the reason behind anomalous fading can be explained by means of tunneling (quantum tunneling) mechanism.