title: Results and implications of high-resolution surface dosimetry of ruthenium-106 eye applicators.
abstract: The dosimetry of 106Ru/106Rh beta-emitting eye applicators is still inadequate. Manufacturer's specifications of absolute dose rates are loaded with a +/- 30% error, and the relative distribution of activity on the surface is measured on a few points only, using a 3-mm plastic scintillation probe. While reducing the absolute error of dose rate measurements to +/- 15% by a method published earlier, we now present a phantom using small thermoluminescent dosimetry crystals for refined assessment of its distribution over the surface. Evaluation of two applicators revealed a 50% increase in activity in the midperiphery in one and a steep falloff of activity 1 mm within the margin of both specimens. The method and findings are demonstrated in detail and compared to those reported by other authors.
authors.affiliation: 1st University Eye Hospital, Vienna, Austria.
authors.forename: R
authors.initials: R
authors.lastname: Menapace
authors.forename: W
authors.initials: W
authors.lastname: Binder
authors.forename: A
authors.initials: A
authors.lastname: Chiari
mesh_terms: D001918:Brachytherapy / Q000295:instrumentation*; D005134:Eye Neoplasms / Q000532:radiotherapy*; D006801:Humans; D008545:Melanoma / Q000532:radiotherapy*; D011879:Radiotherapy Dosage; D012429:Ruthenium Radioisotopes / Q000627:therapeutic use*; D013819:Thermoluminescent Dosimetry / Q000295:instrumentation*
chemical_list: D012429:Ruthenium Radioisotopes