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- Title
Evaluating the Performance of Various Detectors in the Small Field Size by 6 MV Linac.
- Authors
Al Atawneh, Saed J.
- Abstract
Introduction: We present a comprehensive evaluation of three different dosimeters in 6 MV flattening filterfree beam (FFF) under charged particle dis-equilibrium conditions. Material and Methods: Diamond detector, Gafchromic film, and Un-shielded diode detector were used in this study. The total scatters factor of Jaw-shaped fields was measured starting from (10x10 cm2) down to (0.5x0.5 cm²) using True Beam Linear Accelerator (Varian) and solid water phantom. Results: The diamond detector presented more accurate results at an ultra-small field size (0.5x0.5 cm²) with a 14.1% deviation of the diode results. On the other hand, all the measurements ranged within 5% for large field sizes "i.e. Larger than 4.0x4.0 cm²". The relative output factor (ROF) was introduced as a total scatter factor measured by a given dosimeter (x) to total scatter factor measured by diamond detector (OFx/OFdiamond), the relative output factor values were 0.859 and 0.104 for both Diode/Diamond (ROFdiodediamond) and Film/Diamond(ROFfilmdiamond), combinations, respectively. Conclusion: We found that the diamond detector is the most appropriate detector for the small field dosimetry with high accuracy.
- Subjects
DETECTORS; LINEAR accelerators; DOSIMETERS; DIODES; RADIATION dosimetry
- Publication
Iranian Journal of Medical Physics / Majallah-I Fīzīk-I Pizishkī-i Īrān, 2023, Vol 20, Issue 1, p1
- ISSN
1735-160X
- Publication type
Article
- DOI
10.22038/IJMP.2022.63725.2088