title: Dosimetric characteristic of a new 125I brachytherapy source.
abstract: A new brachytherapy (125)I source has been investigated at Iranian Agricultural, Medical and Industrial Research School. Dosimetric characteristics [dose-rate constant Λ, radial dose function g(l)(r) and anisotropy function F(r,)] of IRA-(125)I were theoretically determined in terms of the updated AAPM task group 43 (TG-43U1) recommendations. Versions 5 and 4C of the Monte Carlo radiation transport code were used to calculate the dosimetry parameters around the source. The Monte Carlo calculated dose-rate constant of the (125)I source in water was found to be 92×10(-4) Gy h(-1) U(-1) with an approximate uncertainty of ±3 %. Brachytherapy seed model, 6711-(125)I, carrying (125)I radionuclides, was modelled and benchmarked against previously published values. Finally, the calculated results were compared with the published results of those of other source manufacturers.
authors.affiliation: Agricultural, Medical and Industrial Research School, Nuclear Science and Technology Research Institute, Karaj, Iran. msadeghi@nrcam.org
authors.forename: Mahdi
authors.initials: M
authors.lastname: Sadeghi
authors.forename: Zahra
authors.initials: Z
authors.lastname: Khanmohammadi
mesh_terms: D016880:Anisotropy; D001918:Brachytherapy / Q000379:methods*; D017076:Computer-Aided Design / Q000295:instrumentation*; D004867:Equipment Design; D006801:Humans; D007457:Iodine Radioisotopes / Q000032:analysis* / Q000627:therapeutic use; D009010:Monte Carlo Method; D011868:Radioisotopes / Q000032:analysis / Q000627:therapeutic use; D011874:Radiometry / Q000379:methods*; D011879:Radiotherapy Dosage; D014867:Water / Q000737:chemistry
chemical_list: D007457:Iodine Radioisotopes; D011868:Radioisotopes; D014867:Water