IRSL DATING OF K-FELDSPAR AT ELEVATED-TEMPERATURES AND INFRARED BLEACHING OF TL

Infrared stimulated luminescence (IRSL) is mostly measured at room tem perature, but IRSL intensity can be increased while measured at elevat ed temperatures. Here, IRSL obtained at temperatures ranging from 30 t o 200 degrees C is tested, and the effect on the resulting equivalent doses (ED) is described. A change in ED is found for temperatures abov e 100 degrees C, though no obivous dependence on temperature can be se en. A second experiment investigates the effect of infrared stimulatio n at varying temperatures on TL from K-feldspar. It shows that only a small, fixed amount of TL is bleachable by infrared, independent of bl eaching temperature or time. At the same time, elevated temperatures i ncrease the total amount of IRSL from a sample.