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

Abstract

In this study, the fading mechanism of Seydisehir 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 (RI) at previously desired storage periods. It was observed that the glow curve of Seydisehir alumina consists of four glow peaks between RI and 400 degrees C. The glow peaks (peaks 1, 2 and 3) between room temperature and 250 degrees C possessed very high levels of anomalous fading. However, the intensity of new glow peak at around 378 degrees 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. (C) 2011 Elsevier B.V. All rights reserved.