An Absorbed Dose to Water Primary Standard for Ir-192 Brachytherapy

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El Gamal, Islam Mohamed Medhat




The goal of this work was to develop an absorbed dose to water primary standard for Ir-192 brachytherapy by using a Fricke dosimeter. The radiation chemical yield (G-value) of the Ferric ions in the Fricke solution was measured at Co-60 and 250 kVp X-ray, yielding 1.610 ± 0.010 μmol J-1 and 1.602 ± 0.009 μmol J-1 respectively. A log-linear interpolation was conducted based on the two standard beam values to realize the radiation chemical yield at Ir-192 energy of 1.605 ± 0.005 μmol J-1. A PMMA holder was developed for irradiations using an Ir-192 brachytherapy source and a final uncertainty on the dose to water at the reference position of 0.7 % was achieved, in agreement with NRC air-kerma based standards at the 2σ level.


PHYSICAL SCIENCES Physics - Radiation




Carleton University

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