RARE-EARTH-DOPED FLUORIDE LONG-AFTERGLOW PARTICLE, PREPARATION METHOD THEREFOR AND USE THEREOF

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A rare-earth-doped fluoride long-afterglow particle, comprising a fluoride matrix and a rare earth doping ion, i.e. Ln3+, doped in the fluoride matrix. The fluoride matrix is selected from AReF4 or BaF2, wherein A is selected from alkali metals, and Re is selected from one or more of Y, La, Gd and Lu. The rare earth doping ion, Ln3+, is selected from one or more of Pr3+, Sm3+, Dy3+, Ho3+, Er3+, Tb3+, Nd3+ and Tm3+. The afterglow time of the fluoride long-afterglow particle after X-ray irradiation can be up to 150 days.