Relative Depth-Doses of Curved and Asymmetric Ruthenium or Rhodium CIA and CIB or CIB-2 Model Applicators Used In Eye Brachytherapy - Abstract
The asymmetric CIA and CIB/CIB-2 model applicators containing the beta emitters 106Ru/106Rh are used in radiotherapy to treat ciliary body melanomas or melanomas close to the iris. A serious drawback in the use of these sources is the difficult determination of absorbed dose distributions around them, mainly because of the short range of the beta particles and the steep dose gradients. Furthermore, this symmetry makes the measurements and calculations even harder and may explain the very low quantity of data on them. In this work a simple numerical method was implemented to estimate the dose rates along the central and lateral axis of curved and asymmetric 106Ru/106Rh plaques and results have shown to differ in less than 19% compared to the only Monte Carlo simulation available.