MARIA DA CONCEICAO COSTA PEREIRA
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Possui graduação em Química Industrial pela Escola Superior de Química Oswaldo Cruz (1984), Mestrado pelo Instituto de Pesquisas Energéticas e Nucleares - USP (1997) e Doutorado pelo Instituto de Pesquisas Energéticas e Nucleares - USP (2006). Atualmente é pesquisadora do Instituto de Pesquisas Energéticas e Nucleares. Possui experiência na área de Química e Engenharia Nuclear, atuando principalmente nos seguintes temas: detectores de radiação, tempo de decaimento de luminescência, cintilação e crescimento de cristais cintiladores inorgânicos. Orientadora de Mestrado (Texto extraído do Currículo Lattes em 16 nov. 2021)
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Resumo IPEN-doc 30110 Development and Characterization of the CsI:Tl scintillator grown by the Bridgman technique for use as a radiation detector2023 - SUZART, KAROLINE F.; PEREIRA, MARIA da C.; MESQUITA, CARLOS H. de; POTIENS, MARIA da P.A.Artigo IPEN-doc 29128 Zonal refining and Bridgman technique for CsI:Tl scintillation crystal growth2022 - SUZART, K.F.; PEREIRA, M.C.C.; HAMADA, M.M.; MESQUITA, C.H.This work describes the development of the crystal cesium iodide doped with thallium (CsI:Tl) for use as a radiation detector. For CsI salt purification the zonal refining methodology using a horizontal oven at a constant temperature of 700 °C was used. The high temperature region corresponds to approximately 10% of the salt bed containing (260 mm). This region moves at a speed of 50 mm/h. The crystal growth was carried out by Bridgman technique, using a vertical oven at speed of 1 mm/h.Artigo IPEN-doc 28297 Zonal refining and Bridgman technique for CsI:Tl scintillation crystal growth2021 - SUZART, K.F.; PEREIRA, M.C.C.; HAMADA, M.M.; MESQUITA, C.H.Artigo IPEN-doc 27921 Characterization of the CsI(Tl) crystalline scintillating detector produced at IPEN2021 - SUZART, K.F.; VELO, A.F.; HAMADA, M.M.; PEREIRA, M.C.C.; MESQUITA, C.H.Cesium iodide crystal activated with thallium (CsI(Tl)) is used as radiation sensor because of its favorable characteristics as scintillator, when excited by gamma radiation. This crystal has good mechanical strength and it is relatively little hygroscopic. In the present work, the CsI(Tl) crystal was grown in the Nuclear Energy Research Institute (IPEN/CNEN/SP) by Brigdman technique, in two different formats: (a) cylindric (∅ 20.1 mm x ↑ 11.9 mm) and (b) parallelepiped (12.3 mm x ↑ 19.5 mm). The scintillator spectrometry was studied through five gamma radiation sources: 99mTc (140 keV), 133Ba (355 keV) 22Na (511 keV) and 137Cs (662 keV). The crystals were coupled to a photomultiplier tube using 0.5 McStokes viscosity silicone grease as the optical interface. All electronics for signal measurements were developed at IPEN. Luminescence property of the CsI(Tl) crystal was excited by the radiation from a 137Cs source. The energy resolution of the crystalline detector was determined by the FWHM parameter, corresponding to the photopeak width at half of its height.Artigo IPEN-doc 26199 Development and characterization of CsI (Tl) crystal for use as a radiation detector2019 - SUZART, KAROLINE F.; HAMADA, MARGARIDA M.; PEREIRA, MARIA da C.C.; MESQUITA, CARLOS H. deCesium iodide crystal activated with thallium (CsI(Tl)) is used as radiation sensor because of its favorable characteristics as scintillator when excited by gamma radiation. This crystal has good mechanical strength and it is not hygroscopic. In the present work the CsI(Tl) crystal was growed in the Nuclear Energy Research Institute (IPEN/CNEN/SP) by Brigdman technique in different sizes. The scintillator response was studied through gamma radiation from 99mTc source with the energy of 140 keV. The crystals were coupled to a photomultiplier tube using 0.5 McStokes viscosity silicone grease as the optical interface. All electronics for signal measurements were developed at IPEN. Measurements of luminescence and gamma spectrometry of a 99mTc source were performed. The energy resolution of the crystals was determined by the spectrum photopeak considering its full width at half maximum (FWHM).Artigo IPEN-doc 24773 Characteristics of the CsI:Tl scintillator crystal for X-Ray imaging applications2018 - PEREIRA, MARIA da C.C.; MADI FILHO, TUFIC; BERRETTA, JOSE R.; MESQUITA, CARLOS H. deScintillators are high-density luminescent materials that convert X-rays to visible light. Thallium doped cesium iodide (CsI:Tl) scintillation materials are widely used as converters for X-rays into visible light, with very high conversion efficiency of 64.000 optical photons/MeV. CsI:Tl crystals are commercially available, but, the possibility of developing these crystals into different geometric shapes, meeting the need for coupling the photosensor and reducing cost, makes this material very attractive for scientific research. The objective of this work was to study the feasibility of using radiation sensors, scintillators type, developed for use in imaging systems for X-rays. In this paper, the CsI:Tl scintillator crystal with nominal concentration of the 10−3 M was grown by the vertical Bridgman technique. The imaging performance of CsI:Tl scintillator was studied as a function of the design type and thickness, since it interferes with the light scattering and, hence, the detection efficiency plus final image resolution. The result of the diffraction X-ray analysis in the grown crystals was consistent with the pattern of a face-centered cubic (fcc) crystal structure. Slices 25 × 2 × 3 mm3 (length, thickness, height) of the crystal and mini crystals of 1 × 2 × 3 mm3 (length, thickness, height) were used for comparison in the imaging systems for X-rays. With these crystals scintillators, images of undesirable elements, such as metals in food packaging, were obtained. One-dimensional array of photodiodes and the photosensor CCD (Coupled Charge Device) component were used. In order to determine the ideal thickness of the slices of the scintillator crystal CsI:Tl, Monte Carlo method was used.Artigo IPEN-doc 07264 Desenvolvimento de detector-contador para fins de ensino em instrumentacao nuclear2000 - COSTA, F.E.; HAMADA, M.M.; PEREIRA, M.C.C.; MESQUITA, C.H.Artigo IPEN-doc 02703 Caracterizacao do cristal cintilador CsI(Tl) desenvolvido no IPEN-CNEN/SP1995 - PEREIRA, M.C.C.; HAMADA, M.M.; MADI FILHO, T.; CALVO, W.A.P.; BRUZINGA, W.A.; VIEIRA, J.M.; MESQUITA, C.H.Artigo IPEN-doc 04946 Estudo do tempo de decaimento, resolucao energetica, transmitancia e luminescencia em cristais de iodeto de cesio ativados com talio [CsI(Tl)]1997 - PEREIRA, M.C.C.; HAMADA, M.M.; MADI FILHO, T.; MESQUITA, C.H.