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Lutetium oxyorthsilicate(LSO)have two different phases with monoclinic structure.A-type LSO(A-LSO)is a low-temperature phase with monoclinic structure of space group of P21/c,whereas B-type LSO(B-LSO)is a high-temperature phase with monoclinic structure of space group of C2/c.In present work these two different-type LSO nano-powders with Ce-doped concentration of 0.5at.%were synthesized by a modified sol-gel method.