Preliminary study for dose evaluation depending on dose range with optically stimulated luminescence dosimeter...

Area of Science:

• Medical Physics
• Radiation Dosimetry

Background:

• Optically stimulated luminescence dosimeters (OSLDs) are widely used for radiation dose measurement.
• Accurate dose evaluation is crucial in various applications, including radiation therapy and environmental monitoring.
• Extending the reliable dose range of OSLDs, especially to high doses, is an ongoing area of research.

Purpose of the Study:

• To investigate the dose evaluation capabilities of OSLDs across different dose ranges.
• To assess the feasibility of using OSLDs for high-dose measurements.
• To develop and validate fitting functions for accurate dose determination.

Main Methods:

• Commercial OSLDs were irradiated using a Co-60 gamma source at doses ranging from 0.5 to 40 Gy.
• Dose-response curves were established using reference OSLDs and fitted with linear, quadratic, and cubic functions.
• Test OSLDs were evaluated using the derived fitting functions, and their measurements were compared to the applied doses.

Main Results:

• Linear, quadratic, and cubic functions accurately described the OSLD response in the ranges of 0.5-3 Gy, up to 15 Gy, and up to 40 Gy, respectively (r² > 0.998).
• Measurements using test OSLDs showed an average difference of 0.86 ± 0.27% compared to the applied doses.
• The largest difference was observed at 30 Gy, with an average difference of 2.24 ± 0.24%.

Conclusions:

• OSLDs are capable of accurate dose evaluation across a wide range of radiation doses, including high doses.
• The application of tailored fitting functions and in-house software with a correction process enhances the reliability of OSLD measurements.
• This study confirms the potential of OSLDs for precise dosimetry in scenarios involving high radiation exposures.