Determination of dosimetric characteristics of irseed 125I brachytherapy source

Introduction: low dose rate brachytherapy sources have been widely used for interstitial implants in tumor sites, particularly in prostate. dosimetric characteristics of a new irseed 125i brachytherapy source have been determined using the lif thermoluminescent dosimeter (tld) chips. materials and methods: dose rate constant, radial dose function, and anisotropy function around the irseed 125i source were measured in a plexiglass phantom using tld-100 chips. a plexiglass slab phantom with dimensions of 30×30×7.3 cm3 was used to measure dose distribution around the source. results: dose rate constant was measured to be equal to 0.965±0.006 cgyh-1u-1. radial dose function, anisotropy function, and geometry function have been presented as tabulated data for the irseed source. conclusion: basically, the dosimetric parameters presented here for this new irseed source have clinical and treatment planning applications.