ORLANDO RODRIGUES JUNIOR

Resumo

Bacharelado em Física pela Universidade de São Paulo (1988), mestrado em Tecnologia Nuclear pela Universidade de São Paulo (1993) e doutorado em Tecnologia Nuclear pela Universidade de São Paulo (2003). Pesquisador no Instituto de Pesquisas Energéticas e Nucleares - IPEN, da Comissão Nacional de Energia Nuclear. Atua na área da Dosimetria das Radiações utilizando a técnica de Ressonância Paramagnética Eletrônica - RPE. Possui experiência em Análise de Risco e em Modelagem Computacional da Interação da Radiação com a Matéria. (Texto extraído do Currículo Lattes em 21 dez. 2021)

Projetos de Pesquisa
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Resultados de Busca

Agora exibindo 1 - 10 de 144
  • Artigo IPEN-doc 30670
    Effects of gamma radiation on biopolymer processed by 3D printing
    2024 - GONCALVES, KARINA de O.; ALMEIDA JUNIOR, JOSE N. de; DIAS, DJALMA B.; JUNIOR, ORLANDO R.; SAKATA, SOLANGE K.
  • Artigo IPEN-doc 30586
    Dosimetric analysis of iodine-125 seeds using the Fricke xylenol gel dosimeter
    2024 - TALACIMON, C.; RODRIGUES, P.; TAVARES, P.; TEODORO, L.; BURIN, A.; MEDEIROS, I.; RIGO, M.; KOKA, A.; RODRIGUES, O.; ROSTELATO, M.
  • Artigo IPEN-doc 30572
    Development of an epoxy/carbon fiber composite for radiation attenuation with a dispersion of micro particles of bismuth trioxide (Bi2O3)
    2024 - MUNHOZ, PEDRO M.; NASCIMENTO, FERNANDO C.; RODRIGUES JUNIOR, ORLANDO; POTIENS, MARIA da P.A.; CALVO, WILSON A.P.
  • Artigo IPEN-doc 30552
    Stablishment af a quality control program to PKA meters
    2024 - ALMEIDA JUNIOR, J.N.; RODRIGUES JUNIOR, O.; POTIENS, M.P.A.
  • Artigo IPEN-doc 30551
    Optical computed tomography for chemical dosimetry with Fricke Xylenol gel
    2024 - TAVARES, P.V.S.; DINIZ, R.E.; RODRIGUES JUNIOR, O.; CAMPOS, L.L.
  • Relatório IPEN-doc 30503
    Radioembolização hepática
    2024 - POZZO, LORENA; RIBEIRO, MARTHA S.; SHORTO, JULIAN B.; OLIVEIRA, MERCIA L. de; RODRIGUES JUNIOR, ORLANDO; MENEZES, MARIO O. de
    Este estudo oferece um parecer institucional sobre a incorporação da técnica de radioembolização hepática com microesferas radioativas de Holmio-166 para o paciente com hepatocarcinoma intermediário e avançado irressecável no contexto do Sistema Único de Saúde brasileiro.
  • Relatório IPEN-doc 30502
    Monitoramento de horizonte tecnológico
    2024 -
    Este estudo oferece uma visão abrangente do desenvolvimento atual e futuro das microesferas dopadas com radionuclídeos para a técnica de radioembolização hepática, tanto no contexto interno quanto externo ao Instituto de Pesquisas Energéticas e Nucleares (IPEN). Também aborda sua aplicação e integração nos sistemas de saúde globais.
  • Artigo IPEN-doc 30040
    Enhanced photocatalytic activity and stability of WO3-AgCl/Ag composites
    2024 - PALHARIM, PRISCILA H.; CAIRA, MARIA C.D.; GUSMAO, CAROLINA; RAMOS, BRUNO; CAMARA, ALAN G. da; PACHECO, JOSE G.A.; RODRIGUES JUNIOR, ORLANDO; TEIXEIRA, ANTONIO C.S.C.
    In this work, different structure-directing agents (citric acid, oxalic acid, urea, polyethylene glycol and Triton X-100) were used to synthesize WO3-AgCl photocatalysts by a simple one-step hydrothermal method. The successful synthesis of the materials was proved through various characterization techniques (XRD, BET, SEM, TEM, EDS, UV–vis DRS, XPS, EPR, Mott-Schottky and photoluminescence). The directing agent strongly influenced the morphology of the catalysts, with the material synthesized with citric acid showing the most homogeneous distribution of WO3 and AgCl particles, and the highest photocatalytic activity (100.0% acetaminophen removal after 30 min; k = 0.212 min−1). Stability tests resulted in a performance reduction of only 18.8% after four cycle times. Degradation in real effluent from a pharmaceutical industrial facility showed 83.6% acetaminophen removal. In addition, experiments in a continuous microstructured packed bed reactor revealed 97.9% steady-state contaminant removal.
  • Artigo IPEN-doc 29797
    Enhanced visible light photocatalytic VOC oxidation via Ag‑loaded TiO2/SiO2 materials
    2024 - GUSMAO, CAROLINA de A.; PALHARIM, PRISCILA H.; RAMOS, BRUNO; GOUVEA, DOUGLAS; RODRIGUES JUNIOR, ORLANDO; TEIXEIRA, ANTONIO C.S.C.
    Ag-TiO2/SiO2 materials were synthesized with 1, 3, 5, and 10 wt% Ag contents and extensively characterized by different techniques, including XRD, SEM, TEM, XPS, BET, UV–VIS, EPR, and PL spectroscopy. Subsequently, the activity of these materials in the degradation of a model volatile organic compound (n-hexane) was compared by testing in a continuous gas–solid photoreactor. Loading with Ag induced stabilization of the brookite phase and crystal growth. TEM images showed d-spacing values corresponding to anatase and metallic silver. The specific surface area was lower in the Ag-modified catalysts, probably due to the blocking of the silica gel pores by Ag nanoparticles, whose size (~ 20 nm) was larger than the silica pores (~ 1.98 nm). SEM–EDS images showed heterogeneous distribution of Ag on the surface of the materials. XPS spectra showed bands referring to Ag+ and Ag0 3d, and Ti4+ and Ti3+ 2p. EPR analyses showed that silver loading of TiO2/SiO2 greatly increased the occurrence of oxygen vacancies in the material. Finally, the band gap energies calculated from the UV–VIS spectra were lower in the silver-containing catalysts, dropping from 3.25 to 3.17 eV in the optimal material. Under visible light, while TiO2/SiO2 showed no photoactivity, the Ag-modified materials presented satisfactory steady-state performance (46.4% n-hexane removal).
  • Artigo IPEN-doc 30217
    X- ray experimental set-up for in-vitro nail test
    2023 - ZAMBONI, C.B.; GIOVANNI, D.N.S.; ALMEIDA, M.R.; TODO, A.S.; SABARA, F.; RODRIGUES JUNIOR, O.
    In this investigation, the elements Ca and S were evaluated in a single nail clipping using compact and portable X-ray spectrometer model X-123 SDD with Ag target. Experimental conditions for current, voltage and excitation time were investigated. These analyses can be useful for a variety of applications, including nutritional and medical diagnosis, such as, the evaluation of bone dysfunctions by measurement of Ca (bone decalcification) and S for nutrition evaluations (collagen production). This analysis offers some benefits comparatively to blood and serum analyses, such as, non-invasive collection, fast analyses (minutes) and low cost. In addition, nail clippings are simple to obtain, easy to store, and easy to transport. This pilot study show a positive expectation for clinical application using in-vitro nail test.