Abstract
Lithium aluminate doped with Samarium has been investigated for radiation dosimetric applications. The material was prepared by solid state sintering technique by heating up to 1000 °C. The synthesized material was characterized for its morphology, phase formation, luminescence and dosimetric properties. Sm3+ doped LiAlO2 samples show enhanced sensitivity for thermo-luminescence as well as optically stimulated luminescence as compared to pure LiAlO2 samples. For different concentration of Sm3+ doping, 0.5 mol% Sm doped LiAlO2 samples show the maximum sensitivity. Dose linearity in the TL and OSL mode is studied along with fading and reusability for the 0.5 mol% Sm doped LiAlO2. The MDD for this material was found to be 0.17 mGy in OSL mode and 1.5 mGy in TL mode making it useful for personal dosimetric applications. Further studies revealed that this phosphor is sensitive to both gamma and neutron radiation thus can be used for mixed field applications.
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