ROSIMEIRI GALBIATI TOYOTA
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Artigo IPEN-doc 13441 Tempering effect in ceramics chemical analysis by INAA2008 - 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.Artigo IPEN-doc 13431 The archaeometry study of the chemical and mineral composition of pattery from Brazils's northeast2008 - 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.Artigo IPEN-doc 14079 The archaeometry study of the chemical and mineral composition of pottery from Brasil's Northeast2009 - SANTOS, J.O.; MUNITA, C.S.; TOYOTA, R.G.; VERGNE, C.; SILVA, R.S.; OLIVEIRA, P.M.S.