LUCIO PEREIRA NEVES
26 resultados
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Resumo IPEN-doc 26011 Evaluation of polymer gels using Monte Carlo simulations2018 - SANTOS, W.S.; NEVES, L.P.; PERINI, A.P.; BELINATO, W.; CALDAS, L.V.E.Resumo IPEN-doc 24504 Evaluation of polymer gels using Monte Carlo simulations2017 - SANTOS, W.S.; NEVES, L.P.; PERINI, A.P.; BELINATO, W.; CALDAS, L.V.E.The use of Monte Carlo simulations in dosimetry is a well established area of research, and several correction factors, for ionization chambers, are evaluated with these simulations. Some simulated values are considered even more reliable than the experimental measurements. Besides these uses with ionization chambers, Monte Carlo simulations may also be employed in the development and characterization of new dosimetric materials, as polymer gels. Polymer gels are largely employed in radiotherapy dosimetry to mimic human tissue [1,2]. New polymer gels were studied in order to better represent different organs or tissues, to provide more reliable results, or even to use different measurement techniques. The objective of this study is to evaluate the dosimetric properties of polymer gels, in relation to its mass-energy absorption coefficients, energy response and tissue equivalence. For this purpose the MCNPX Monte Carlo code was utilized. Four different materials, employed in radiotherapy dosimetry were evaluated in this work: MAGAS (methacrylic acid gelatine gel with ascorbic acid), MAGAT (methacrylic acid gelatine and tetrakis), AMPS (2-Acrylamido-2-MethylPropane Sulfonic acid) and MAGIC (Methacrylic and Ascorbic acid in Gelatin Initiated by Copper). For all simulations carried out, the values were within an acceptable uncertainty and in accordance to the expected results.Resumo IPEN-doc 24455 Avaliação dosimétrica de procedimentos de tomossíntese mamária2017 - NEVES, LUCIO P.; SILVA, RAYRE J.V.; PERINI, ANA P.; SANTOS, WILLIAM de S.; VEDOVATO, ULY P.Resumo IPEN-doc 23760 Estimate of S-values for children due to six positrons emitting radionuclides used in PET examinations2016 - BELINATO, W.; SANTOS, W.S.; PERINI, A.P.; CALDAS, L.V.E.; NEVES, L.P.; SOUZA, D.N.Resumo IPEN-doc 22632 Determinação de fatores de conversão das doses em Tomografia Computadorizada odontológica de feixe cônico utilizando método de Monte Carlo2015 - BELINATO, WALMIR; SANTOS, WILLIAN S.; NEVES, LUCIO P.; PERINI, ANA P.; CALDAS, LINDA V.; SOUZA, DIVANIZIA N.Resumo IPEN-doc 21379 A new cubic phantom for PET/CT dosimetry: experimental and Monte Carlo characterization2015 - BELINATO, WALMIR; SILVA, ROGERIO M.V.; SANTOS, WILLIAM S.; PERINI, ANA P.; NEVES, LUCIO P.; CALDAS, LINDA V.E.; SOUZA, DIVANIZIA N.Resumo IPEN-doc 20655 Evaluation of a tissue equivalent ionization chamber in X-ray beams2014 - PERINI, ANA P.; NEVES, LUCIO P.; SANTOS, WILLIAN de S.; FRIMAIO, AUDREW; COSTA, PAULO R.; CALDAS, LINDA V.E.Resumo IPEN-doc 20469 A comparison between two brazilian calibration systems for diagnostic radiology level2014 - NEVES, LUCIO P.; PERINI, ANA P.; GUIMARAES, MARGARETE C.; OLIVEIRA, PAULO M.C. de; SANTOS, WILLIAN de S.; VIVOLO, VITOR; SILVA, TEOGENES A. da; CALDAS, LINDA V.E.Resumo IPEN-doc 20550 Determination of the X-ray spectrum of a small animal PET/CT employing the MCNP5 Monte Carlo code2014 - NEVES, LUCIO P.; PERINI, ANA P.; SANTOS, WILLIAN de S.; SQUAIR, PETERSON; CALDAS, LINDA V.E.; MAIA, ANA F.; POZZO, LORENAResumo IPEN-doc 20461 Evaluation of medical and occupational shielding in cerebral angiography using Monte Carlo simulations and virtual anthropomorphic phantoms2014 - SANTOS, WILLIAM S.; NEVES, LUCIO P.; PERINI, ANA P.; CALDAS, LINDA V.E.; MAIA, ANA F.
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