Computerised analysis of LiF GR-200 TL signals: application to dose measurements in the μGy range

The features of a simple program for the computerised analysis of the LiF GR-200 glow curve are described. The adverse influence of the high residual signals characteristic of this material has been effectively eliminated for doses in the range 0.5-300 μGy. This program for TL evaluation, together with some improvements in the reader temperature measurement and control, permit one to obtain very good dose results in this dose range employing only reader anneal. The good dosimetric performance achieved under these simple working conditions has been shown in a detailed experiment whose results are also presented here. Very reproducible ambient dose results have been obtained in real working conditions exposing GR-200 dosemeters for times ranging between five hours and three months. (author)