NOE GABRIEL PINHEIRO MACHADO
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Artigo IPEN-doc 29363 Study on the potential of laser ablation to decontaminate radioactive waste2022 - COSTA, PRISCILA; STIPP, WAGNER; VICENTE, ROBERTO; MACHADO, NOE G.P.; RAELE, MARCUS P.Laser is a promising tool to decontaminate radioactive waste that is impregnated with radionuclides on its surface, the decontamination process has no chemical inputs, and the pollutants can be fixed in HEPA filters. The current study aimed to test a wide range of samples using 10 different materials and fluences ranging from 1 to 10 J/cm2.Artigo IPEN-doc 29359 Femtosecond production of gold nanoparticles suitable for nanobrachytherapy2022 - MACHADO, NOE G.P.; ROSERO, WILMMER A.A.; ROSSI, WAGNER de; RAELE, MARCUS P.The present work approaches the production of AuNPs through femtosecond laser ablation of a solid in a liquid media. Aiming at oncological applications, the stabilization of the colloidal solution was performed with non-cytotoxic material.Artigo IPEN-doc 25742 Boron film laser deposition by ultrashort pulses for use as neutron converter material2019 - COSTA, PRISCILA; RAELE, MARCUS P.; MACHADO, NOE G.P.; SILVA, ANDRE F.; VIEIRA JUNIOR, NILSON D.; GENEZINI, FREDERICO A.; SAMAD, RICARDO E.This study investigated the production of boron films by femtosecond pulsed laser deposition (PLD) to be used as converters on bulk semiconductor neutron detectors. The ablation threshold of metallic boron was determined and the film growth was studied as a function of deposition time (5–90 min) and laser pulse energy (35–530 μJ). The films were characterized by scanning electron microscopy (SEM), revealing a flaky morphology, optical profilometry, which determined the films thicknesses (from 80 nm up to 4 μm), Ion Beam Analysis (IBA) that assessed their elemental composition and X-ray diffraction (XRD), which revealed an amorphous structure. In addition, a thermal load study was performed to evaluate the heat flux onto the substrate during deposition process. Stable boron films obtained show that the femtosecond PLD process is reliable and reproducible for the fabrication of thick boron coatings.Artigo IPEN-doc 24814 Femtosecond pulsed laser deposition of a boron thin film aiming at the development of a low-cost neutron detector2018 - COSTA, PRISCILA; RAELE, MARCUS P.; SAMAD, RICARDO E.; MACHADO, NOE G.P.; VIEIRA JUNIOR, NILSON D.; GENEZINI, FREDERICO A.Boron thin films were produced using femtosecond pulsed laser deposition aiming at the development of a neutron detector. As neutrons have no charge, in order to detect this particle converter materials are applied, promoting nuclear reactions that result in the emission of charged particles, allowing the neutrons presence to be indirectly inferred. Among the possible conversion materials, 10B has a considerable cross section for thermal neutrons and accessible cost. Furthermore, the nuclear reaction produces easily detectable alpha particles, making it a rational option to develop a low cost and portable neutron detector. The boron ablation threshold fluence has been measured by the Diagonal Scan (Dscan) technique that resulted in the minimum laser energy value of 17.7 (6) μJ and fluence of 5.63(19) J/cm2. Boron deposition was performed varying the pulse energy and deposition duration. The growth rate, morphological and physical aspects of the boron pulsed laser deposition were characterized by a Scanning Electron Microscope and an optical profilometer. The films surfaces have a flaky aspect with eventual droplets which had decayed overtime to a more smooth surface. The studied parameters allowed producing a boron coating with the optimal thickness in order to minimize self-absorption effect in the film, thus increasing efficiency.