Thermally Induced Fading of Individual Glow Peaks in LiF:Mg,Cu,P at Different Storage Temperatures

The time evolution of individual TL peak intensities in LiF:Mg,Cu:P has been studied for several storage temperatures ranging from -20°C to +50°C and for time periods from 10 min to 3 months. The experiments were carried out using commercially available LiF:Mg,Cu,P phosphors (GR-200 from China, MCP-N from Poland). The glow curves obtained were analysed using the FADA deconvolution program developed at CIEMAT. The influence of initial trap filling was studied by comparing two sets of detectors irradiated before and after the storage period. The results show no major differences between the two LiF:Mg,Cu,P varieties. The data show a good stability (1.00 ± 0.06) of the main dosimetric peak (peak 4) at all temperatures and over all time periods. In contrast, peak 2 and peak 3 show an exponential decrease, the rate of which strongly depends on storage temperature (peak 3 half-life changes from 300 h at room temperature to 20 h at +50°C).