Validating Fricke dosimetry for the measurement of absorbed dose to water for HDR 192Ir brachytherapy: a comparison between primary standards of the LCR, Brazil, and the NRC, Canada

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DOIResolve DOI: https://doi.org/10.1088/1361-6560/aab2b8
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FormatText, Article
Journal titlePhysics in Medicine and Biology
ISSN0031-9155
1361-6560
SubjectFricke dosimetry; Ir-192 HDR brachytherapy; absorbed dose standards
Abstract
Two Fricke-based absorbed dose to water standards for HDR Ir-192 dosimetry, developed independently by the LCR in Brazil and the NRC in Canada have been compared. The agreement in the determination of the dose rate from a HDR Ir-192 source at 1 cm in a water phantom was found to be within the k=1 combined measurement uncertainties of the two standards: DNRC/DLCR = 1.011, standard uncertainty = 2.2 %. The dose-based standards also agreed within the uncertainties with the manufacturer’s stated dose rate value, which is traceable to a national standard of air kerma. A number of possible influence quantities were investigated, including the specific method for producing the ferrous-sulphate Fricke solution, the geometry of the holder, and the Monte Carlo code used to determine correction factors. The comparison highlighted the lack of data on the determination of G(Fe3+) in this energy range and the possibilities for further development of the holders used to contain the Fricke solution. The comparison also confirmed the suitability of Fricke dosimetry for Ir-192 primary standard dose rate determinations at therapy dose levels.
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PublisherIOP
LanguageEnglish
Peer reviewedYes
NPARC number23002805
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Record created2018-03-01
Record modified2020-03-16
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