Feasibility Studies of EU+LI Co-Doped GD2O3 as a Thermo Luminescence Detector for UV Emission

We have already studied the possibility to apply some sintered crystals such as ZrO2 doped with Er and Li as appropriate detectors for ultra-violet (UV) light. The detection of the (UV) irradiation exploits the thermoluminescence (TL) emission of some crystals (phosphors) after being exposed to W irradiation with wavelength in the interval of 280nm 360nm. It turned out that such crystals are easy to create and their TL glow cuvres possess well-shaped peaks with sufficient statistical data. In this article we present the results of our research toward the creation of netu sintered crystals, sensible to the W emission. Analysis of the thermoluminescence properties of Gd,O3, doped with Eu and Li has been conducted. Different quantities of lithium co-dopant have been added as Li2CO3 to a mixture of Gd2O3 with 10 wt% Eu2O3. Pellets sintered at a temperature of 1000 0C have been prepared and the kinetic parameters of the phosphors have been studied after irradiation with W light from a XBO lamp. It has been shown that the addition of 16 wt% Li2CO3of to the mixture of Gd2O3 with 10% Eu2O3 yields a maximum intensity of the peaks at 87 0C and at 145 0C . Spectral emission and spectral sensitivity of the phosphors have been studied. The analysis applied to TL glow curves, obtained from the UV irradiated phosphors and kept after the irradiation at different times in a dark storage, revealed that the peaks have and relatively long fading. Analysis of the thermoluminescence properties of the phosphors obtained from Gd2O3, doped with Eu and Li, shows that the possess a good sensitivity to the UV emission and could be used for quantitative measurements of UV light.