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A stable hydrogel 3D dosimeter was prepared by using Fricke solution, poly (vinyl alcohol) (PVA) and glutaraldehyde (GA). A linear relationship between the dose and the UV absorbency was obtained by determining the color change of the dosimeter in the range of 0–2.5Gy. Dimethyl sulfoxide (DMSO) was used as a free radical scavenger to analyze the thermo-stability and diffusion of FPGX gel dosimeter...