title: Determination of active pellets' position in the selectron-HDR vaginal tube using a therados RFA-3 water phantom system.
abstract: The method for determination of the active pellets' position in the Selectron vaginal tube is shown. A special steel cap shielding with narrow window mounted above the Therados RFA-3 semiconductor detector was constructed. By scanning along the Selectron line vaginal tube in air and water, for an appropriate distance with mild dose gradient, the actual active pellets' positions can be determined. The resolution was higher during scanning in the air than in water. The minimum number of tries for checking the whole system depends on the total number of pellet sources in the main safe, and the number of active pellets used. Advantages of this method, compared to other conventional methods for determination of the Selectron-HDR source positions, are associated with high resolution and capability of repetition without movement of the tube during checking procedure.
authors.affiliation: Radiation Physics Group, Institute of Oncology and Radiology Belgrade, Yugoslavia.
authors.forename: L J
authors.initials: LJ
authors.lastname: Grzetić
authors.forename: J
authors.initials: J
authors.lastname: Stanković
authors.forename: M
authors.initials: M
authors.lastname: Sarić
authors.forename: P
authors.initials: P
authors.lastname: Stajković
mesh_terms: D001918:Brachytherapy / Q000295:instrumentation / Q000379:methods / Q000592:standards; D005260:Female; D006801:Humans; D008961:Models, Structural; D011874:Radiometry; D014621:Vagina