THE INFLUENCE OF THE HEATING-SYSTEM ON THE HYPERSENSITIVE THERMOLUMINESCENT MATERIAL LIF-MG,CU,P (GR-200)

Considerable efforts have been made to optimise and standardise the th ermal handling procedures for the use of LiF:Mg,Cu,P (GR-200A) detecto rs at the CIEMAT Environmental TLD Monitoring System. Two different TL D readers (planchet, hot gas) and more than 500 single detectors were employed and more than 10,000 individual readouts were performed for t hese tests. The detectors were annealed and irradiated to 80 mu Gy, wh ich is the usual environmental monthly dose. This scheme was repeated for up to fifty readouts with each one of the studied readout cycles w ith both heating systems in order to analyse and compare the main char acteristics of the material; sensitivity, stability, permanence of gro w curve shape and residual dose. Some heating parameters are suggested but, considering the differences between heating techniques, heating adjustment studies in situ are strongly recommended.