Comprehensive Monte Carlo calculations of AAPM Task Group Report No. 43 dosimetry parameters for the Model 3500 I-Plant 125I brachytherapy source.
The Model 3500 I-Plant 125I brachytherapy source, produced by Implant Sciences Corporation, is created through a novel technique which utilizes ion implantation of 124Xe into a ceramic matrix followed by neutron activation of the substrate. Clinical dosimetry parameters were calculated using MCNP. For data processing, a 0.376 cm active length was used for the geometry function. The 2-D anisotropy function, F(r, 0), exhibited less anisotropy than the Amersham Health Model 6711 source, and decreased as radial distance, r, increased. The anisotropy constant, phi an, was 0.933; dose rate constant, lambda, was 1.017 +/- 0.005 cGy/h/U; and radial dose function, g(r), for r = (0.1, 0.2, 0.5, 2, 5, 10 cm) was 0.990, 1.014, 1.030, 0.872, 0.448, and 0.114, respectively. In general, there was good agreement with experimental results recently obtained by others using thermoluminescent dosimeters.
Rivard
Mark J
MJ
Department of Radiation Oncology, Tufts University School of Medicine, New England Medical Center #246, 750 Washington Street, Boston, MA 02111, USA. mrivard@lifespan.org
D001918:Brachytherapy / Q000295:instrumentation* / Q000706:statistics & numerical data; D003198:Computer Simulation; D006801:Humans; D007457:Iodine Radioisotopes / Q000627:therapeutic use*; D009010:Monte Carlo Method; D017785:Photons; D011880:Radiotherapy Planning, Computer-Assisted
D007457:Iodine Radioisotopes