Montecarlo simulation of isodose distribution for Ir192 brachytherapy
Montecarlo simulation of isodose distribution for Ir-192 brachytherapy treatments with the GEANT 4 toolkit Garelli 1 S. , Foppiano 1 F. , Paoli 1 G. , Agostinelli 1, 2 S. , Pia 3, 4 M. G. , Tropeano 5 M. Fisica Medica, Istituto Nazionale per la Ricerca sul Cancro, Genova - Italia 2 Istituto Nazionale di Fisica della Materia, Genova - Italia 3 Istituto Nazionale di Fisica Nucleare, Genova - Italia 4 European Organization of Nuclear Research, Geneva - Switzerland 5 Università di Genova, Dipartimento di Fisica di Genova - Italia 1 garelli@hp 380. ist. unige. it Source geometry Brachytherapy facility installed at the National Cancer Institute of Genova: Microselectron High Dose Rate (HDR) afterloading system 192 Ir source < E > = 356 ke. V For every new source: • we perform calibration following the Italian Protocol for Dosimetry in Brachyterapy • we measure air kerma rate with a well-type PTW ionisation chamber Procedure verification Simulation of anisotropy coefficient at a distance of 6 cm from the source with the variation of the longitudinal axis angle Results cell dimension: 1 mm 3 number of photons generated: 10. 000 simulation time: 12 h on a Intel PC 300 MHz Simulation of energy deposition in water along transverse axis Results cell dimension: 1 mm 3 number of photons generated: 10. 000 simulation time: 12 h on a Intel PC 300 MHz Simulation of isodose distribution in water material cell dimension: 1 mm 3 number of photons generated: 2. 000 simulation time: 2 h on a Intel PC 300 MHz Results Geant 4 is a new toolkit for the simulation of the passage of particles through matter. Its application areas include high energy physics and nuclear experiments, medical accelerator and space physics studies. It is based on Object Oriented technology and has been developed using the C++ computer language
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