Abstract
Abstract Two 106Ru applicators of the type CCB as manufactured by the Zentralinstitut für Isotopen- und Strahlenforschung (Berlin, GDR) were investigated. The homogeneity of the relative dose distribution at the surface of the applicators was determined. For the evaluation of the data extremely small TLD crystals (2x1x1 mm3) had to be manufactured as well as an almost tissue-equivalent acrylic eye phantom. In order to ensure reproducibility of the applicator positioning, the plaque suture eyelets had to be placed on locating pins. 120 measurement points located within the active plaque area of 20 mm diameter were evaluated. The results show that the area to be used in tumour treatment is about 20 to 25% less than expected. One plaque shows a considerable inhomogeneity with respect to dose distribution (up to 40%). A modified eye phantom was used for the determination of the central axis depth dose distribution.
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