On the dosimetric influences of air-Kerma strength calibration geometry and internal source structure for 103 and 125I brachytherapy sources

Research output: Contribution to journalConference article

Abstract

Monte Carlo photon-transport simulation techniques are used to study the influence of the new wide-angle free-air chamber (WAFAC) on low energy interstitial source dosimetric parameter. For sources containing radio opaque components with sharp corners, or low density components coated with high density materials, oblique filtration unexpectedly induces primary photon flux anisotropy near the transverse plane at typical calibration distances. Thus, the dose-rate constant may vary as much as 11% with the solid angle subtended by the SK measurement instrument. For the Model 200 103Pd source, and by extension, other "thin radio opaque layer" seeds, the WAFAC renders the absolute dose-rate distribution near the seed independent of this dense layer and its thickness.

Original languageEnglish
Pages (from-to)368-371
Number of pages4
JournalAnnual International Conference of the IEEE Engineering in Medicine and Biology - Proceedings
Volume1
StatePublished - Dec 1 2000
Event22nd Annual International Conference of the IEEE Engineering in Medicine and Biology Society - Chicago, IL, United States
Duration: Jul 23 2000Jul 28 2000

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