ESTRO 2024 - Abstract Book

S309

Brachytherapy - Head & neck, skin, eye

ESTRO 2024

Figure 1: Setup equipment. (1) Sylvac S246 micrometer screw, (2) attachment for the detector, (3) marble used for reproducible positioning of the detector, (4) attachment for the plaque and (5) cylindrical PMMA phantom, which is filled with water during measurements.

Results:

The absorbed dose rates to water measured with the diodes and alanine detectors fell within the vendor's expanded measurement uncertainty, 11% (k=2), but the results were lower than the vendor's values. For the CCB applicators at the 2 mm distance reference point, the absorbed dose rates measured with the diode detectors were on average 9% lower, while the absorbed dose rates measured with alanine detectors were 7.4% lower. For the CCA applicator, the absorbed dose rate was 7% and 4.6% lower for diode- and alanine detectors, respectively. Detailed preliminary results are shown in Figure 2.