SU-E-T-157: Reproducibility of CVD Diamond Detectors for Radiotherapy Dosimetry

Medical Physics
G T BetzelJ Meyer

Abstract

Three diamond x-ray detectors fabricated in-house using films from the same batch of commercially-available chemical vapor deposition (CVD) diamond were investigated for performance inter-comparability under clinically relevant conditions. Detectors were based on single-crystal CVD diamond films (0.5 × 3 × 3 mm̂3) with 0.4 mm^3 sensitive volumes, which were encapsulated with PMMA. Detectors were placed in a (30 × 30 × 30 cm̂3) PTW water phantom. Six-MV photons from an Elekta Synergy linac were measured using an SSD of 90 cm and 10 cm phantom depth with a 10 × 10 cm̂2 field size in the central axis of the beam. Data acquisition was performed using a PTW UNIDOS E electrometer. Leakage current, priming dose, response dynamics, dose linearity, dependence on dose rate and angular dependence were used to evaluate differences between diamond detectors. Differences were seen in leakage currents before (< 1.5 pA) and after (< 12 pA) irradiation. A priming dose of ∼7 Gy and rise and fall times of 2 s were found for all three detectors. Sensitivities differed by up to 10%. Dependence on dose rate was similar (Fowler fitting parameter, delta = 0.92-0.94). Angular dependence was minimal (97-102% average). Differences in detector performance...Continue Reading

Citations

Jun 21, 2018·Physics in Medicine and Biology·Benjamin E W ScarletRobert J W Louwe

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