Iranian Journal of Physics Research (May 2017)
Study of the effect of thermal treatment on the Emission Spectrum from LiF:Mg,Cu,P compared to LiF:P
Abstract
Thermoluminescence material LiF:Mg,Cu,P was produced using standard GR200 dopant concentrations and its emission and absorption spectrums was measured after beta irradiation. The alterations resulting from various thermal treatments, excessing the recommended temperatures namely 240ºC on the emission and absorption spectrums has been investigated. The main peak of absorption spectrum, which is relevant to F centers, don’t exhibits any difference to the absorption spectrum of LiF:Mg,Ti, which in turn demonstrates the dominant function of F centers in formation of trap centers in both TL materials. The TL Material LiF:Mg,Cu,P is sensitive to the temperatures higher than 240ºC and the results show that main peak of absorption spectrum shifts to lower wavelength with increasing the temperature to 400ºC. Furthermore the investigation of TL sensitivity from LiF:P at temperatures above 240ºC confirms the role of P impurity in sensitivity reduction from LiF:Mg,Cu,P at temperatures higher than 240ºC.
