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Kara, E. ; Woda, C.

Further characterization of BeO detectors for applications in external and medical dosimetry.

Radiat. Meas. 165:106950 (2023)

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Measuring absorbed doses with high precision and accuracy for clinical applications using Optically Stimulated Luminescence (OSL) dosimeters can help to optimize treatment to patients. Beryllium Oxide (BeO) is a nearly tissue-equivalent material that has the potential to increase the applicability of OSL dosimetry in medical dosimetry, but there has been limited research into its characterization. We present here the characterization of BeO dosimeters in terms of annealing temperature and duration, the effect of preheat treatment on short-term fading, energy and angular dependence, and discuss possible errors in laboratory conditions by using the OSL technique. Shorter readoutof 30 s when using stimulation power of ∼30 mW cm2 is feasible but preheating then becomes necessary. The fading behavior of BeO was found to be dose-dependent in this case. Reproduciblity of an OSL measurement with repositioning of the dosimeter in the reader and for the short reaout times was found to be ∼1%. Energy response was close to the theoretical values, which agrees with some but differs from other published studies, indicating that the OSL efficiency might vary. The angular dependence presented the greatest uncertainty factor. In summary, BeO dosimeters have the potential to be used in clinical applications for dose evaluation. However, care should be taken while handling and applying an optimized measurement procedure is necessary due to the complex luminescence mechanism of the material.

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