ROSIMEIRI GALBIATI TOYOTA

ROSIMEIRI GALBIATI TOYOTA

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INAA: A link between past and present in retrieving of peoples identities
2007 - MUNITA, C.S.; SANTOS, J.O.; TOYOTA, R.G.; NUNES, K.P.; OLIVEIRA, P.M.S.; FERREIRA, D.S.
Provenance study of marajo pottery by moussbauer spectroscopy, XRD and INAA
2008 - SCORZELLI, R.B.; MUNAYCO, P.; MUNITA, C.S.; SANTOS, E. dos; TOYOTA, R.G.; SCHAAN, D.P.
Preliminary study of the effect of temper in Marajoara ceramics
2007 - TOYOTA, R.G.; MUNITA, C.S.; NEVES, E.G.; DEMARTINI, C.C.
Compositional groupings of some ancient native pottery made in Marajo Island
2007 - TOYOTA, ROSIMEIRI G.; MUNITA, CASIMIRO S.; MENEZES, MARIO O.; NEVES, EDUARDO G.; DEMARTINI, CELIA C.
The utilization of trace chemical composition to correlate ceramics with clay deposits
2007 - NUNES, KELLY P.; TOYOTA, ROSIMEIRI G.; MUNITA, CASIMIRO S.; OLIVEIRA, PAULO M.S.; NEVES, EDUARDO G.; SOARES, EMILIO A.A.
In this work, 22 clay samples near Hatahara and Açutuba archaeological sites, and 135 ceramic samples were analyzed by means of Instrumental Neutron Activation Analysis. INAA is the most suitable technique because it does not require mineralization of samples and has high sensitivity, accuracy and precision. The samples were irradiated in IEA-R1 reactor at IPEN-CNEN-SP at thermal neutron flux of 8,92x10 12 cm -2 s -1 during one hour. The elementary concentration results were studied using multivariate statistical methods. The compositions group classification was done through cluster analysis and the similarity/dissimilarity among the samples was studied by means of discriminant analysis.
Preliminary study of chemical compositional data from amazon ceramics
2005 - TOYOTA, R.G.; MUNITA, C.S.; NEVES, E.G.; LUZ, F.A.; OLIVEIRA, P.M.S.
Application of INAA to provenance study of ceremics from baixo Sao Francisco River, Sergipe, Brazil
2007 - MUNITA, C.S.; SANTOS, J.O.; VERGNE, C.; TOYOTA, ROSIMEIRI G.
Estudo preliminar da composicao mineralogica de ceramicas Marajoara por difracao de raios X
2010 - NUNES, KELLY P.; TOYOTA, ROSIMEIRI G.; MUNITA, CASIMIRO S.; CARVALHO, FLAVIO M.S.; NEVES, EDUARDO G.; DEMARTINI, CELIA C.
Tempering effect in ceramics chemical analysis by INAA
2008 - MUNITA, CASIMIRO S.; TOYOTA, ROSIMEIRI G.; OLIVEIRA, PAULO T.M.; NEVES, EDUARDO G.; DEMARTINI, CRISTINA C.
Archaeological ceramics are manufactured with clay and usually potters added a material named temper that can be a mineral or organic material. Temper modifies the chemical and physical properties of clay and improves its workability. When INAA is used, the analysis reflects total composition, i.e., the elements in the clay as well the ones in the tempering. In this work the concentration of Ba, Ce, Co, Cr, Cs, Eu, Fe, Hf, K, La, Lu, Rb, Na, Nd, Sb, Sc, Sm, Ta, Tb, Th, Yb, Zn and U in 161 samples of Marajoara pottery were determined using INAA. The samples were obtained using a tungsten carbide drill and dried in an oven at 105o C for 24 hours. The samples and standards were irradiated in the swimming pool research reactor, IEA-R1 (IPEN-CNEN/SP), at a thermal neutron flux of about 5 x 1012 n cm-2 s-1 for 8 hours. Two measurements series were carried out, after 7 days and 25-30 days. The results were studied by means of modified Mahalanobis filter and multivariate statistical methods to verify the effect of the temper on the determination of trace elements. The results showed that the temper effect in the pottery is negligible.
The archaeometry study of the chemical and mineral composition of pattery from Brazils's northeast
2008 - SANTOS, J.O.; MUNITA, C.S.; TOYOTA, R.G.; VERGNE, C.; SILVA, R.S.; OLIVEIRA, P.M.S.
In this study, chemical and mineralogical analyses were performed on ceramics and clay samples from Barracão archaeological site located in Baixo São Francisco River. The chemical and mineral analysis was performed by INAA and by means differential scanning calorimetry (DSC). The data set was studied by means of cluster analysis and discriminant analysis. The results showed that the raw material used in ceramics is not local. By using DSC it was possible to discover that the principal minerals in the samples are quartz, feldspars, mica and kaolinite. The existence of kaolinite denotes that the firing temperature of the pottery analyzed was lower than 500 °C. The results obtained in this study, in association with archaeological information, allowed for the identification of the ceramic groups relative to the ceramists occupations at Xingó area.