Determination of Dosimetric Characteristics of IrSeed 125I Brachytherapy Source

Document Type : Original Paper


1 Educational Development Center, Ilam University of Medical Sciences, Ilam, Iran

2 Nuclear Science Research School, Nuclear Science and Technology Research Institute, Tehran, Iran

3 Department of Radiation Medicine, University of Shahid Beheshti, Tehran, Iran


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.
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.
Basically, the dosimetric parameters presented here for this new IrSeed source have clinical and treatment planning applications.


Main Subjects