Abstract
Lithium Calcium borate (LiCaBO 3) polycrystalline thermoluminescence (TL) phosphor doped with rare earth (RE 3+) elements has been synthesized by high temperature solid state diffusion reaction. The reaction has produced a very stable crystalline LiCaBO 3:RE 3+ phosphors. Among these RE 3+ doped phosphors thulium doped material showed maximum TL sensitivity with favorable glow curve shape. TL glow curve of gamma irradiated LiCaBO 3:Tm 3+ samples had shown two major well-separated glow peaks at 230 and 430 °C. The glow peak at 430 °C is almost thrice the intensity of the glow peak at 230 °C. The TL sensitivity of the phosphor to gamma radiation was about eight times that of TLD-100 (LiF). Photoluminescence and TL emission spectra showed the characteristic Tm 3+ peaks. TL response to gamma radiation dose was linear up to 10 3 Gy. Post-irradiation TL fading on storage in room temperature and elevated temperatures was studied in LiCaBO 3:Tm 3+ phosphor.
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