Dosimetry of 106Ru eye applicators with a p-type silicon detector.
Beta emitting 106Ru-applicators are used to treat choroidal melanoma. In order to improve the accuracy and simplify the dosimetry of these applicators, the suitability of using a p-type silicon semiconductor detector has been investigated. The detector is calibrated in a low energy electron beam. An important property of the detector for this application is that the linear scattering power of the epoxy resin that surrounds the silicon crystal is within 1% of that for water, in the energy interval of interest. Furthermore the variation in the mass collision stopping power ratio water to silicon is within 4% in this energy interval. The accuracy of the dose-rate measured with the detector is about 5% for this application.
Lax
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Department of Hospital Physics, Karolinska Hospital, Stockholm, Sweden.
D001918:Brachytherapy / Q000295:instrumentation*; D002830:Choroid Neoplasms / Q000532:radiotherapy*; D006801:Humans; D008545:Melanoma / Q000532:radiotherapy*; D011874:Radiometry / Q000295:instrumentation*; D011879:Radiotherapy Dosage; D012429:Ruthenium Radioisotopes / Q000627:therapeutic use*
D012429:Ruthenium Radioisotopes