The thermoluminescence behaviour of CaF2-Dy (TLD-200) for low up to high doses

The behaviour of the thermoluminescence (TL) of CaF2-Dy (TLD-200) has been investigated for doses up to 1.5*107 rad. Five major glow peaks have been studied. The response of these peaks with doses was followed. Three peaks (at 124, 140 and 340 degrees C) show a supralinear response, while the two other (188 and 234 degrees C) do not. The total TL light exhibits supralinearity in the region between 103 and 105 rad and levels out at about 106 rad. The thermoluminescent parameters (E,S, tau ) of the glow peaks where found by the initial rise method. The results are discussed and possible explanations for the supralinearity are proposed.