Abstract
The purpose of this investigation was to provide a high resolution 2D scanning feasibility study for PRESAGE® dosimeters using UV/VIS spectrophotometry. Previously the light absorbance of PRESAGE® has only been made at a single point using UV/VIS spectrophotometry. The CLARIOstar microplate reader can operate as a 2D scanning UV/VIS spectrophotometer measuring the light absorbance at multiple points of a PRESAGE® dosimeter. Water equivalent PRESAGE® dosimeters were fabricated in a rectangular shape and were irradiated with 6 and 18 MV x-ray beams using a medical linear accelerator. The optical density values of the PRESAGE® dosimeters were measured pre and post-irradiation using a CLARIOstar microplate reader. Depth dose curves and beam profiles were validated against ionisation chamber measurements. The agreement between the two dose measuring devices is well within experimental uncertainties. This investigation demonstrated that depth dose curves and beam profiles can be measured with high resolution in 2D for megavoltage x-ray beams with PRESAGE® dosimeters using UV/VIS spectrophotometry. Additionally, one PRESAGE® dosimeter was also fabricated with the inclusion of an inhomogeneity to investigate the effect on the dose distribution beyond the inhomogeneity. There is also the potential to extend this method to obtain 3D dosimetry scanning.
Published Version
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