IRSL dating of K-feldspar at elevated temperatures and infrared bleaching of TL

Abstract

Infrared stimulated luminescence (IRSL) is mostly measured at room temperature, but IRSL intensity can be increased while measured at elevated temperatures. Here, IRSL obtained at temperatures ranging from 30 to 200°C is tested, and the effect on the resulting equivalent doses (ED) is described. A change in ED is found for temperatures above 100°C, though no obvious dependence on temperature can be seen. A second experiment investigates the effect of infrared stimulation at varying temperatures on TL from K-feldspar. It shows that only a small, fixed amount of TL is bleachable by infrared, independent of bleaching temperature or time. At the same time, elevated temperatures increase the total amount of IRSL from a sample.