Equivalent dose determination using single aliquots

Two methods for the determination of equivalent dose using single aliquots of potassium feldspar are described. The non-destructive nature of infrared stimulated luminescence (IRSL) has made it possible to make repeated luminescence measurements on a single aliquot without apparently changing the sensitivity of the material. Such an approach has been made practicable using the IRSL add-on to the Riso automated thermoluminescence (TL) reader (Botter-Jensen et al., Nucl. Tracks 18, 257-263, 1991). The hardware and software that have made this possible are described. The method based upon the regeneration technique does appear to suffer from problems of changes in sensitivity when bleaching between doses. It is hypothesized that this is due to partial emptying of the trapped charge population. In the case of the additive dose technique, no such problem is seen. The precision of both techniques is far superior to normal TL and IRSL techniques. The accuracy appears good for the additive dose technique, but not for regeneration.