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[en] Proton beams in medical applications deal with relatively thick targets like the human head or trunk. Therefore, relatively small differences in the total proton stopping power given by the different models provided by GEANT4 can lead to significant disagreements in the final proton energy spectra, for example, when integrated along long proton trajectories. This work presents proton energy spectra obtained by GEANT4.8.2 simulations using ICRU49, Ziegler1985 and Ziegler2000 models for 19.68MeV and 49.10MeV protons passing through a number of aluminum or gold absorbers with various thicknesses. The spectra were compared with the experimental data of Tschalar, with TRIM/SRIM2008 and MCNPX2.4.0 simulations, and with the Payne analytical solution for the transport equation in the Fokker-Plank approximation. (Author)
Source
Centro de AplicacionesTecnologica y Desarrollo Nuclear (CEADEN), La Habana(Cuba); Instituto Superior de Tecnologias y Ciencias Aplicadas (InsTEC), La Habana(Cuba); Agencia de Energia Nuclear y Tecnologia de Avanzada(AENTA), La Habana (Cuba); 1 CD-ROM; ISBN 978-959-7136-62-0; 
; Feb 2009; 1.18 MB; WONP-NURT 2009: 6. International Symposium on Nuclear and Related Techniques and 12. Workshop on Nuclear Physics; La Habana (Cuba); 9-12 Feb 2009; Available fron Centro de Aplicaciones Tecnologica y Desarrollo Nuclear (CEADEN), La Habana (CU). Email. marta@ceaden.edu.cu; Centro de Gestion de la Informacion y Desarrollo de la Energia (Cubaenergia), La Habana (CU) ,Email. belkis@cubaenergia.cu; 2 Figs., 16 Refs.
; Feb 2009; 1.18 MB; WONP-NURT 2009: 6. International Symposium on Nuclear and Related Techniques and 12. Workshop on Nuclear Physics; La Habana (Cuba); 9-12 Feb 2009; Available fron Centro de Aplicaciones Tecnologica y Desarrollo Nuclear (CEADEN), La Habana (CU). Email. marta@ceaden.edu.cu; Centro de Gestion de la Informacion y Desarrollo de la Energia (Cubaenergia), La Habana (CU) ,Email. belkis@cubaenergia.cu; 2 Figs., 16 Refs.