The application of GEANT4 simulation code to the verification of a brachytherapy calibration procedure

The MicroSelectron High Dose Rate (HDR) system, installed at the National Institute for Cancer Research of Genova, uses a high activity Iridium-192 source which can be programmed to stay in specific positions for defined periods of time. The source consists of a cylinder of 0.6 mm of diameter and 3.5 mm length which is packed into a stainless steel tube of 1.1. mm of diameter and 5.0 mm length.