CARLA DA COSTA GUIMARÃES
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Resumo IPEN-doc 15531 GEANT4 simulation of the angular dependence of TLD based monitor response2006 - GUIMARAES, C.C.; MORALLES, M.; OKUNO, E.Artigo IPEN-doc 08840 Monte Carlo simulations of X-ray generation and detection2002 - MORALLES, M.; GUIMARAES, C.C.; OKUNO, E.Artigo IPEN-doc 17555 Aplications of the Monte Carlo method in nuclear physics using the GEANT4 toolkit2008 - MORALLES, MAURICIO; GUIMARAES, CARLA C.; BONIFACIO, DANIEL A.B.; OKUNO, EMICO; MURATA, HELIO M.; BOTTARO, MARCIO; MENEZES, MARIO O.; GUIMARAES, VALDIRArtigo IPEN-doc 20029 Monte Carlo simulation of liver cancer treatment with sup(166)Ho-loaded glass microspheres2014 - GUIMARAES, CARLA da C.; MORALLES, MAURICIO; MARTINELLI, JOSE R.Microspheres loaded with pure beta-emitter radioisotopes are used in the treatment of some types of liver cancer. The Instituto de Pesquisas Energe´ticas e Nucleares (IPEN) is developing 166Ho-loaded glass microspheres as an alternative to the commercially available 90Y microspheres. This work describes the implementation of a Monte Carlo code to simulate both the irradiation effects and the imaging of 166Ho and 90Y sources localized in different parts of the liver. Results obtained with the code and perspectives for the future are discussed.Artigo IPEN-doc 11192 Response of thermoluminescent dosimeters to photons simulated with the Monte Carlo method2005 - MORALLES, M.; GUIMARAES, C.C.; OKUNO, E.Artigo IPEN-doc 14652 Physical models, cross sections, and numerical approximations used in MCNP and GEANT4 Monte Carlo codes for photon and electron absorbed fraction calculation2009 - YORIYAZ, HELIO; MORALLES, MAURICIO; SIQUEIRA, PAULO de T.D.; GUIMARAES, CARLA da C.; CINTRA, FELIPE B.; SANTOS, ADIMIR dosPurpose: Radiopharmaceutical applications in nuclear medicine require a detailed dosimetry estimate of the radiation energy delivered to the human tissues. Over the past years, several publications addressed the problem of internal dose estimate in volumes of several sizes considering photon and electron sources. Most of them used Monte Carlo radiation transport codes. Despite the widespread use of these codes due to the variety of resources and potentials they offered to carry out dose calculations, several aspects like physical models, cross sections, and numerical approximations used in the simulations still remain an object of study. Accurate dose estimate depends on the correct selection of a set of simulation options that should be carefully chosen. This article presents an analysis of several simulation options provided by two of the most used codes worldwide:MCNP and GEANT4. Methods: For this purpose, comparisons of absorbed fraction estimates obtained with different physical models, cross sections, and numerical approximations are presented for spheres of several sizes and composed as five different biological tissues. Results: Considerable discrepancies have been found in some cases not only between the different codes but also between different cross sections and algorithms in the same code. Maximum differences found between the two codes are 5.0% and 10%, respectively, for photons and electrons. Conclusion: Even for simple problems as spheres and uniform radiation sources, the set of parameters chosen by any Monte Carlo code significantly affects the final results of a simulation, demonstrating the importance of the correct choice of parameters in the simulation.Artigo IPEN-doc 16110 Dose-rate distribution of sup(32)P-glassmicrospheres for intra-arterial brachytherapy2010 - GUIMARAES, CARLA C.; MORALLES, MAURICIO; SENE, FRANK F.; MARTINELLI, JOSE R.