Analysis of the Thermal Annealing Regeneration Process of RPL Dosimeters for High Dose Levels

This work provides the analysis of two thermal treatments for the annealing regeneration process of radiophotoluminescent dosimeters (RPLDs) used in high-level dose measurements. After regeneration, dosimeter sensitivity was assessed through several irradiation campaigns, with doses reaching up to 500 kGy using 60Co gamma radiation and X-rays with an energy spectrum up to 100 keV. The regenerated dosimeters exhibited good agreement, with deviations less than 10% up to 10 kGy. Fading effects were also monitored, and the proposed thermal treatments had no significant impact on the decay rate of the optical centers. Both annealed and pristine dosimeters have shown negligible fading effects over 300 days, confirming the stability of the optical centers.