ESTRO 2024 - Abstract Book

S310

Brachytherapy - Head & neck, skin, eye

ESTRO 2024

Figure 2: Absorbed dose rate to water values at different depths determined from three different institutes with three different methods all with independent metrological traceability: Alanine detectors, vendor certificate and diode detectors. In each figure the ratio of alanine/vendor and diode/vendor is shown on the right Y axis The dashed orange lines represent the combined expanded uncertainty on the ratio alanine/vendor (i.e. 13% (k=2), 7% for alanine and 11% for vendor).

Conclusion:

Our study showcases an efficient vendor independent measurement protocol for verifying 106Ru eye-plaque absorbed dose-rates. The dose rates measured by diode and alanine detectors both show lower dose rates compared to what the vendor specifies, but they are still within the vendor's expanded measurement uncertainty. The discrepancy is to be further investigated. The dedicated setup equipment provided high repeatability, which is crucial for reliably measuring the sharp dose gradients from 106Ru. Diode detectors calibrated in 60Co/6MeV