Temperature Effect on Radiation‐Induced Attenuation for Radiophotoluminescent FD‐7 Glass Dosimeters at High X‐Ray Doses

Commercial radiophotoluminescent (RPL) FD‐7 glasses are used as passive dosimeters for personal and medical applications, to measure doses up to 100 Gy. However, a dedicated setup and calibration can extend their operation range allowing their operation in high‐radiation environments, such as the ones produced by particle accelerators, where doses ranging up to the MGy level can be measured. At such doses, the dosimeters progressively darken with dose and so radiation‐induced attenuation (RIA) becomes relevant for the readout process. This work focuses on the online RIA dependence on irradiation temperature, whose variation between room temperature and 120°C during irradiation is studied. Dose rates of 1.77 and 0.18 Gy s −1 are used to reach a target dose of 7 kGy using X‐ray tubes operated at 100 kV. RIA is found to depend on temperature, dose rates, and wavelengths. The results show a clear decrease in dose readout of dosimeters irradiated at temperature higher than room temperature, leading up to 60% of dose underestimation for RPL irradiated at 120°C. This is due to the complex combined effects of temperature and radiation on the defects responsible for signal readout.