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In Situ Dose Measurements in Brachytherapy Using Scintillation Detectors Based on the Al2O3:C, Al2O3:C,Mg, and
Sandra Witkiewicz-Lukaszek1, Janusz Winiecki2,3, Bogna Sobiech2
1Faculty of Physics, Kazimierz Wielki University in Bydgoszcz, Powstańców Wielkopolskich Street 2, 85-090 Bydgoszcz, Poland.
Fiber-optic dosimeters using Al2O3:C and GAGG:Ce crystals show linear dose response for real-time brachytherapy monitoring. These dosimeters enable accurate in situ dose measurements during cancer treatments.
Area of Science:
- Medical Physics
- Materials Science
- Radiotherapy
Background:
- Fiber-optic dosimeters offer real-time dosimetry for brachytherapy using scintillation crystals.
- Al2O3:C, Al2O3:C,Mg, and GAGG:Ce crystals are evaluated for their dosimetric properties.
Purpose of the Study:
- To assess the applicability of fiber-optic dosimeters for in situ dose measurements in brachytherapy.
- To evaluate the dose-response linearity of Al2O3:C, Al2O3:C,Mg, and GAGG:Ce crystals.
Main Methods:
- Scintillation crystals (Al2O3:C, Al2O3:C,Mg, GAGG:Ce) connected via optical fibers to luminescence spectrometers.
- Measurements performed in a phantom under clinical brachytherapy conditions using an 192Ir source.
- Dose range evaluated: 0.5-8 Gy.
Main Results:
- A clear linear relationship was observed between delivered radiation dose and scintillation output.
- The GAGG:Ce crystal detector demonstrated excellent linearity.
- Al2O3:C and Al2O3:C,Mg crystal detectors showed a nearly linear dose-response.
Conclusions:
- Fiber-optic dosimeters are suitable for real-time in situ dose monitoring during brachytherapy.
- Al2O3:C, Al2O3:C,Mg, and GAGG:Ce crystals provide reliable dosimetry for brachytherapy applications.
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