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This invention relates to the field of high-sensitivity radiation detection technology, specifically disclosing a method for preparing silver-doped boron phosphate glass sheets and their applications. The invention involves mixing, degassing, and melting the component raw material powders, pouring the molten glass into a preheated graphite mold, and then annealing, grinding, polishing, and cutting to obtain silver-doped boron phosphate glass sheets. By precisely controlling the P:B ratio and annealing process, this invention introduces B-O-P bridging and B-O-B structures at the glass network structure level, significantly improving the structural and environmental stability of the glass and overcoming the technical defects of existing silver-doped phosphate glasses, such as easy hydrolysis and fragility. The prepared glass sheets exhibit excellent photoluminescence properties, with a good linear relationship between luminescence intensity and radiation dose in the 0-50 Gy dose range, and possess neutron detection potential. They can be applied in fields such as radiation monitoring, high spatial resolution X-ray imaging, non-destructive testing, biomedical imaging, and encryption and anti-counterfeiting technologies.