MARCO ANTONIO STANOJEV PEREIRA
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Artigo IPEN-doc 25827 Study of the fish fossil Notelops brama from Araripe-Basin Brazil by Neutron Tomography2019 - PUGLIESI, REYNALDO; PEREIRA, MARCO A.S.; ANDRADE, MARCOS L.G.; BASSO, JULIANA M.L.; VOLTANI, CIBELE G.; GONZALES, IVONE C.In the last decade, Neutron Tomography significantly gained importance as an analyzing tool to inspect samples of paleontological interest. In general, neutrons are able to provide new and complementary information when compared to the ones provided by X-rays imaging methods. Specifically, in the present paper, the Neutron Tomography equipment of the IPEN-CNEN/SP was successfully applied to investigate the internal structure of a fish fossil, embedded in a calcareous concretion. The resulting images, which will be presented, has revealed different contrast between several regions within the specimen enabling the differencing of osteological structures of the fossil, information about its state of conservation, degree of embedding, inclusions as well as regions within the concretion which could be related to humidity or to other substances and minerals containing hydrogen naturally added to the fossil. The technique is non-destructive and non-invasive allowing a close analysis of the specimen. Furthermore, the obtained images have demonstrated the feasibility of the equipment at IPENCNEN/ SP for investigating this kind of sample.Artigo IPEN-doc 24774 Penetration of the consolidant Paraloid (R) B-72 in Macuxi indigenous ceramic vessels investigated by neutron tomography2018 - PEREIRA, MARCO A.S.; PUGLIESI, REYNALDOThe neutron tomography technique was applied in studying the penetration of the consolidant Paraloid (R) B-72 in contemporary indigenous ceramic vessels. The study was carried out for two distinct and controlled air humidity conditions, 40% and 90%, in which the vessels were exposed, before the consolidant application. The obtained images have proved that the penetration of Paraloid (R) B-72 in the ceramic does not depend on the humidity condition in which it was applied, moreover allowed a macro-visualization of the consolidant penetration in the ceramic vessel. As the vessels used in the present work were manufactured by an indigenous artisan, Macuxi, according to the same procedures and raw materials used by the ancient artisans, the results obtained can be used as a guide to assist experts, both in the study of archeological objects of Macuxi origin, as well as other objects that had been made by other tribes that lived in the same Amazon region, in Brazil.Artigo IPEN-doc 23097 Penetração e distribuição do consolidante Paraloid® B-72 em cerâmica branca estudada por tomografia com nêutrons2017 - PEREIRA, MARCO A.S.; PUGLIESI, REYNALDO; ANDRADE, MARCOS L.G.; PRUDENCIO, MARIA I.ASSESSMENT OF PARALOID® B-72 PENETRATION IN WHITE CERAMIC STUDIED BY NEUTRON TOMOGRAPHY. The neutron tomography technique was employed to study the penetration and distribution of the consolidant Paraloid® B-72 in ceramic. This study was carried out in white contemporary ceramic vessels which were maintained in two distinct and controlled air humidity conditions, 35% and 90%, before the consolidant application (brushing technique). The results showed that the treatment with Paraloid® B-72 is more effective when applied in the drier vessel. The depth of penetration for the vessel at 35%, reaches (3.3 ± 0.1) mm in the wall, while for the one at 90%, (1.9 ± 0.1) mm, and the maximal concentration impregnation was 26% higher. The 3D images allowed a visualization of the impregnation process, that is, its distribution, failures, homogeneity, boundary between materials. These results demonstrated the feasibility of the neutron tomography technique and of the equipment of IPEN-CNEN/SP, in support the expert work in the field of preservation and restoration of ceramic objects.Artigo IPEN-doc 21332 Study of pixel damages in CCD cameras irradiated at the neutron tomography facility of IPEN-CNEN/SP2015 - PUGLIESI, R.; ANDRADE, M.L.G.; DIAS, M.S.; SIQUEIRA, P.T.D.; PEREIRA, M.A.S.Artigo IPEN-doc 20649 The new facility for neutron tomography of IPEN-CNEN/SP and its potential to investigate hydrogenous substances2014 - SCHOUERI, R.M.; DOMIENIKAN, C.; TOLEDO, F. de; ANDRADE, M.L.G.; STANOJEV PEREIRA, M.A.; PUGLIESI, R.Artigo IPEN-doc 20289 The feasibility of the polycarbonate Durolon sup(TM) as a thermal neutron dosimeter2014 - PUGLIESI, F.; STANOJEV PEREIRA, M.A.; PUGLIESI, R.; DIAS, M.S.Artigo IPEN-doc 20264 Improved track-etch neutron radiography using CR-392014 - STANOJEV PEREIRA, M.A.; MARQUES, J.G.; PUGLIESI, R.; SANTOS, J.P.Artigo IPEN-doc 11427 Study of the neutron radiography characteristics for the solid state nuclear track detector Makrofol-DE2002 - PUGLIESI, REYNALDO; PEREIRA, MARCO A.S.