Assessment of the strength of individual 192Ir seeds in ribbons

Bruce Thomadsen, Larry DeWerd, Todd McNutt, Scott DeWerd, Dan Schmidt

Research output: Contribution to journalArticlepeer-review

2 Scopus citations


Assessing the strength of individual seed-type sources in ribbon assembles remains a challenge in brachytherapy quality assurance. Geometries to measure a single source in the ribbon usually fail because of low signals if using very thick shielding to block the radiation from the other sources, or contributions from all the other sources if they are not shielded well. A normal well-type chamber with partial lead shielding forming a small slot provides a differential response along the chamber axis that, through a deconvolution/simultaneous-equations technique, sorts the contributions from each source, allowing the derivation of each source's strength.

Original languageEnglish (US)
Pages (from-to)2471-2475
Number of pages5
JournalMedical physics
Issue number11
StatePublished - Nov 1999
Externally publishedYes


  • Brachytherapy
  • Calibration
  • Ir
  • Quality assurance
  • Source strength

ASJC Scopus subject areas

  • Biophysics
  • Radiology Nuclear Medicine and imaging


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