MARCELO MIYADA REDÍGOLO

MARCELO MIYADA REDÍGOLO

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NAA and XRF techniques to investigate artistic paints
2022 - KOKA, A.C.S.S.; ZAMBONI, C.B.; GIOVANNI, D.N.S.; REDÍGOLO, M.M.
In this study, the multielemental characterization of artistic blue paints from the 90's and currently available ones in the Brazilian market was carried out using the Energy Dispersion X-Ray Fluorescence (EDXRF) and Neutron Activation Analysis techniques (NAA). These results aim to establish a reference database in the field. The EDXRF measurements was performed using portable X-ray spectrometer with Ag X-ray tube associated with a Si Drift detector (25 mm2 x 500 μm) with Be window (12.5 μm). The artistic paint samples were irradiated for 300 s using 30 kV and 5μA excitation. The quantitative analysis was performed using WinQXas software program (IAEA, version 1.3). The NAA measurements were performed in the nuclear reactor IEA-R1 (3.5- 4.5MW, pool type) at IPEN/CNEN-SP. Each sample was irradiated from minutes to hours and gamma counting was performed using HPGe detector (ORTEC-GEM 60195) coupled to an MCA (ORTEC - 919E). Concentration of all elements was obtained using the ATIVAÇÃO software. The results obtained by both techniques are in good agreement, in addition to being complementary. However, they do not correspond to the elemental content description provided by the manufacturer.
Analysis of XX century gold-silver coins by X-ray fluorescence and neutron tomography
2022 - ZAMBONI, C.B.; STANOJEV, M.; KOKA, A.C.S.S.; GIOVANNI, D.N.S.; REDÍGOLO, M.M.
X-ray fluorescence (XRF) is a technique capable of analyzing chemical elements on metallic surfaces, providing fast, sensitive, and reliable results while neutron tomography (NT) allows to investigate its internal structure by three-dimensional images. Both techniques are powerful tools for non-destructive analysis of artistic and historical objects. In this study, we explored the combined use of these techniques to investigate a set of Brazilian gold-silver coins dating from the early 20th century (1913-1938). This set of coins was select due to the lack of data related to their composition and origin. These data provide information to museologists for better cataloging / registration of fundamental information. Moreover, this information is vital for collectors and marchands in authentication processes. The X-Ray Fluorescence analysis was performed using X-Ray Spectrometer with gold (Au) and silver (Ag) targets. The excitation conditions were optimized in 30 kV and 5 μA and counting time of 200 s. A NT facility is installed at the beam-hole (BH-14) of the 4.5 MW pool-type IEA-R1 nuclear research reactor at IPEN (SP, Brazil). It consists of a 6LiF (ZnS) scintillator screen, a glass-based plane mirror, a video camera (16bit, 1024 x1024 pixels, cooled CCD) and a collimator to reduce the neutron beam size in the BH-14. The experimental conditions established were: 8 x106 ns-1 cm-2 (neutron flux), irradiation time/image of 1s, spatial resolution of 263 ± 35 μ and time tomography of 400s. The three-dimensional images were treated using dedicated software (OctopusV8.0 and VG studio Max2.2). The combined results bring information of elemental composition and 3D images highlight the conservation state of the pieces, being of great aid to conservators and museologists.
Non-destructive analysis in the study of historical photographs by pXRF and ATR-FTIR spectroscopies
2021 - ZAMBONI, CIBELE B.; REDÍGOLO, MARCELO M.; MIURA, VINICIUS T.; COSTA, ISOLDA; NAGAI, MARIA L.E.; SALVADOR, PABLO A.V.; SILVA, DALTON G.N. da
Material characterization is essential to the provenance of graphic arts. Non-destructive analytical techniques are increasingly required in the authentication process of cultural heritage. This work presents a suite of portable, non-destructive, and complementary analytical techniques, energy dispersive x-ray fluorescence (EDXRF), Fourier transform infrared (FTIR) spectroscopies, and brightfield microscopy, applied to the analysis of historical photographs depicting São Paulo city architecture, whose registration date and process of fabrication are unknown. The EDXRF analysis emphasizes the use of typical POP (printing-out paper) photograph with baryta (BaSO4) coated paper substrate while the FTIR and microscopy analyses confirm the presence of collodion and a gelatin-based baryta layer. This photographic process was widely employed by professional photographers from 1889 to 1930, when it was gradually abandoned in commercial use. This time interval (1889–1930) is consistent with the information surveyed on the photographic collection. In conclusion, employing complementary techniques (elemental and molecular spectroscopies and image magnification) is essential in identifying the manufacturing materials of cultural heritage material, which is the basis of contemporary authentication procedures. These data provide to curators and historians fundamental information for cataloging, adding subsidies for the correct storage and preservation (“heritage appreciation”). Still, for professional photographers, they present information on the manufacturing processes of historical photographs. The data from the present study also emphasize its perspective of use in graphic arts to aid connoisseurship in identifying forgeries during provenance and authentication studies.
Comparative study of inorganic elements determined in whole blood from Dmdsup(mdx)/J mice strain by EDXRF and NAA analytical techniques
2016 - REDIGOLO, M.M.; SATO, I.M.; METAIRON, S.; ZAMBONI, C.B.
Comparative study of inorganic elements determination in whole blood from Dmdsup(mdx)/J mice strain by EDXRF and NAA analytical techniques
2014 - REDIGOLO, MARCELO M.; SATO, IVONE M.; METAIRON, SABRINA; ZAMBONI, CIBELE B.
Determinacao de elementos inorganicos em sangue total de populacao brasileira saudavel pela tecnica de EDXRF
2009 - REDIGOLO, MARCELO M.; ZAMBONI, CIBELE B.; SALVADOR, VERA L.R.; SATO, IVONE M.
Inorganic elements determination in laboratory animals whole blood samples EDXRF technique
2010 - REDIGOLO, M.M.; AGUIAR, R.; ZAMBONI, C.B.; SALVADOR, V.L.R.; SATO, I.M.
Comparative study of inorganic elements determination in whole blood from DmDsup(mdx)/J mice strain by EDXRF and NAA analytical techniques
2013 - REDIGOLO, M.M.; SATO, I.M.; METAIRON, S.; ZAMBONI, C.B.
Comparative study of inorganic elements determination in whole blood from Crioula breed horse by EDXRF and NAA analytical techniques
2012 - BAPTISTA, TATYANA S.; REDIGOLO, MARCELO M.; ZAMBONI, CIBELE B.; SATO, IVONE M.; MARCELINO, JOSE R.
Determination of reference interval values for inorganic elements in whole blood samples of humans and laboratory animals by X-ray fluorescence spectrometry
2013 - REDIGOLO, M.M.; AGUIAR, R.O.; ZAMBONI, C.B.; SATO, I.M.