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Experimental determination of dosimetry functions of Ir‐192 sources
Author(s) -
Anctil JeanClaude,
Clark Brenda G.,
Arsenault Clément J.
Publication year - 1998
Publication title -
medical physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.473
H-Index - 180
eISSN - 2473-4209
pISSN - 0094-2405
DOI - 10.1118/1.598457
Subject(s) - dosimetry , imaging phantom , brachytherapy , thermoluminescent dosimetry , lithium fluoride , nuclear medicine , radiation treatment planning , thermoluminescent dosimeter , dose rate , materials science , physics , medical physics , radiation therapy , medicine , dosimeter , nuclear physics , radiology
Experimental data related to the dosimetric characteristics of Ir‐192 brachytherapy sources are limited. The aim of this work was to obtain the dosimetry functions required by the American Association of Physicists in Medicine Task Group 43 for both a low and a high dose‐rate iridium‐192 brachytherapy source through dose measurements in a water‐equivalent phantom. Dose measurements have been performed using lithium fluoride thermoluminescent detectors positioned in a polystyrene phantom at distances from the source that vary from 1 to 10 cm, with 1 cm intervals, and at angles that vary from 0° to 170° with 10° intervals. The anisotropy functions, radial dose functions, and dose rate constants were determined for both brachytherapy sources. The precision of results obtained on those relatively fine intervals of angles and distances provides clinics with the possibility to use and interpolate the complete data sets for treatment planning.