Optical fibers have been demonstrated as a potential contestant for radiation dose sensor due to its high resolution, acceptable sensitivity, and linear response over wide range of dose in compare with the commercial dosimeter sensors. A high sensitive dosimeter in radiation therapy could be very helpful, for measuring accurate dose delivered to the tumor which results in a better treatment by higher controlling the tumors and lower post radiation therapy complications [3]. Many different types of materials and elements have been doped in silica fiber optics and glasses to develop the radiation dose sensitivity. Among them germanium, lithium and barium, aluminium, manganese calcium tetra-borate doped (CaByO7:Mn) nanocrystal, zirconium oxide, titanium oxide doped in lithium potassium borate glass and magnesium oxide could be named. In such studies, besides looking for a high sensitive material and/or optimum concentration for radiation dose detection; new methods that can gain sensitivity of an optical fiber were discussed [4,5].
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