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Can small field diode correction factors be applied universally?
Paul Z Y Liu1, Natalka Suchowerska1, David R McKenzie2
1School of Physics, The University of Sydney, Australia; Department of Radiation Oncology, Chris O'Brien Lifehouse, Camperdown, Australia.
Summary
Diode detectors can be reliably corrected for over-response in small radiation fields. Developed correction factors are transportable across various beam qualities and irradiation conditions, improving dosimetry accuracy.
Area of Science:
- Medical Physics
- Radiation Dosimetry
- Detector Technology
Background:
- Diode detectors are widely used for radiation dosimetry.
- Over-response in small radiation fields is a known issue with diode detectors.
- Existing diode correction factors may lack universal applicability.
Purpose of the Study:
- To assess the universal applicability of diode correction factors.
- To determine if correction factors are consistent across different beam qualities.
- To investigate diode detector over-response in small fields.
Main Methods:
- Developed a mathematical model for diode over-response based on field size.
- Utilized previously published experimental data comparing diodes to scintillation dosimeters.
- Compared calculated correction factors with literature values.
Main Results:
- The mathematical relation accurately predicted diode correction factors for field sizes from 5 to 30 mm.
- Average deviation between measured and predicted over-response was 0.32% for specific diode types.
- Diode over-response showed minimal dependence on linac type, collimation, or measurement depth.
Conclusions:
- The developed mathematical relation aligns with published correction factors.
- Diode correction factors demonstrate robustness and transportability across different radiation beams.
- This study validates the universal application of diode correction factors under various conditions.
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