Results and implications of high-resolution surface dosimetry of ruthenium-106 eye applicators

Ophthalmologica. 1992;204(2):93-100. doi: 10.1159/000310276.


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.

Publication types

  • Comparative Study

MeSH terms

  • Brachytherapy / instrumentation*
  • Eye Neoplasms / radiotherapy*
  • Humans
  • Melanoma / radiotherapy*
  • Radiotherapy Dosage
  • Ruthenium Radioisotopes / therapeutic use*
  • Thermoluminescent Dosimetry / instrumentation*


  • Ruthenium Radioisotopes