This study leverages the ability of polytetrafluoroethylene (PTFE) to generate stable free radicals under ionizing radiation to develop a solid PTFE dosimeter sheet. Experimental results indicate a strong positive correlation between free radical response and absorbed dose over a broad range (1-180 kGy). The performance of the dosimeter was minimally influenced by dose rate and energy dependence,while the effects of irradiation temperature and post-irradiation storage time on free-radical decay exhibited clear and consistent patterns. Unlike conventional dosimeters used in the industry,the PTFE dosimeter is suitable for high-dose measurements and calibrations,covering a range of 1-180 kGy with a total uncertainty of less than 5.02%,demonstrating high metrological reliability. This study provides valuable insights into precise dose control and calibration in the irradiation processing of polymers and other functional materials.