title: Dosimetric characteristics of the ¹⁹²Ir high-dose-rate afterloading brachytherapy source.
abstract: OBJECTIVE
  For the treatment of some cancerous tumors using brachytherapy, an American Association of Physicists in Medicine (AAPM) Task Group No. 43U1 report recommends that the dosimetric parameters of a new brachytherapy source must be determined in two experimental and Monte Carlo theoretical methods before using each new source clinically. This study presents the results of Monte Carlo calculations of the dosimetric parameters for a Ir2.A85-2 brachytherapy source design.
  
  
  METHODS
  Version 5 of the (MCNP) Monte Carlo radiation transport code was used to calculate the dosimetry parameters around the source.
  
  
  RESULTS
  The Monte Carlo calculated dose rate constant, Λ, of the Ir2.A85-2 source was found to be 1.113 ± 0.033 cGyU(-1)h(-1). Also in this study, the line-source radial dose function, g ( l )(r) and the anisotropy function, F(r,θ), have been calculated at distances from 0.5 to 10 cm. The results of these calculations have been compared with the published data for the same source.
  
  
  CONCLUSIONS
  All the results are in good concordance with previously published data, with a few exceptions in small angles and short distances. The dosimetric parameters calculated in this work can be used as input data in a treatment planning system (TPS) for exact brachytherapy treatment planning or to verify the calculations of the TPS used in brachytherapy.
authors: Agricultural, Medical, and Industrial Research School, Nuclear Science and Technology Research Institute, PO Box 31485/498, Karaj, Tehran, Iran. msadeghi@nrcam.org
authors: Mahdi
authors: M
authors: Sadeghi
authors: Fatemah
authors: F
authors: Taghdiri
authors: Pooneh
authors: P
authors: Saidi
mesh_terms: D016880:Anisotropy; D001918:Brachytherapy / Q000706:statistics & numerical data*; D004867:Equipment Design; D007496:Iridium Radioisotopes; D008954:Models, Biological; D009010:Monte Carlo Method; D011874:Radiometry / Q000706:statistics & numerical data*; D011879:Radiotherapy Dosage
chemical_list: D007496:Iridium Radioisotopes