title: Assessment of the strength of individual 192Ir seeds in ribbons.
abstract: 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.
authors.affiliation: Department of Medical Physics, University of Wisconsin, Madison 53706, USA. brthomad@facstaff.wisc.edu
authors.forename: B
authors.initials: B
authors.lastname: Thomadsen
authors.forename: L
authors.initials: L
authors.lastname: DeWerd
authors.forename: T
authors.initials: T
authors.lastname: McNutt
authors.forename: S
authors.initials: S
authors.lastname: DeWerd
authors.forename: D
authors.initials: D
authors.lastname: Schmidt
mesh_terms: D001918:Brachytherapy / Q000295:instrumentation* / Q000592:standards; D002138:Calibration; D007496:Iridium Radioisotopes / Q000627:therapeutic use*; D008962:Models, Theoretical; D011785:Quality Assurance, Health Care; D011835:Radiation Protection; D011879:Radiotherapy Dosage / Q000592:standards*; D015203:Reproducibility of Results
chemical_list: D007496:Iridium Radioisotopes