Search Results
You are looking at 1 - 6 of 6 items for
- Author or Editor: M. Vassilaki-Grimani x
- Refine by Access: All Content x
Abstract
Instrumental neutron activation analysis has been applied for the determination of 20 minor and trace elements (As, Ce, Co, Cr, Cs, Eu, Fe, Hf, La, Lu, Na, Rb, Sb, Sc, Sm, Ta, Tb, Th, Yb and Zn) in two groups of potsherds which had been excavated at two different sites of Greece, the islands of Thasos (Group A) and Delos (Group B). A good agreement for all the elements examined between the pottery specimens of Groups A and B was found. The matching in chemical composition between the stylistically related potteries of Group A (Thasos) and Group B (Delos) provides strong support for the archaeologist's hypothesis that the two groups of potsherds belong to the same major group of “melian” pottery.
Abstract
Seventeen trace elements (As, Ce, Co, Cr, Cs, Eu, Fe, Hg, Hf, La Lu, Rb, Sb, Sc, Sm, Yb and Zn) have been determined by Instrumental Neutron Activation Analysis in sediments from the upper Saronikos Gulf, Greece. It was found that the discharge of industrial and domestic wastes in the Keratsini and Elefsis bays of the upper Saronikos Gulf had led to elevated concentrations of all toxic and other trace elements determined over at least 100 km2 of seafloor. Increases above natural level range from 2 fold for rare earths to 200 fold for arsenic.
Abstract
Two different instrumental neutron activation analysis (INAA) methods were applied to characterize chemically 74 ceramic roof tile samples, found in the town of Pella, Greece and dated back to the Hellenistic Period (3rd century B. C.). The samples were first analyzed for 17 elements with a 4 hour irradiation and two counts and then re-analyzed for 9 elements with a 1 minute irradiation and two counts of short-lived radioisotopes. The results of both methods were very similar, showing the validity of the rapid INAA method (1 min irradiation) in the study of ancient ceramics. All samples were divided into 4 chemical groups, each one representing a different tiling.
Abstract
Instrumental Neutron Activation Analysis (INAA) has been applied for the determination of 8 rare earth elements (REE) in sediment cores collected from stations of polluted and unpolluted areas of Northern Saronikos Gulf. The REE determined in cores are: La, Ce, Sm, Eu, Tb, Dy, Yb and Lu. Higher levels of all REE were found in the cores from polluted areas of N. Saronikos Gulf as compared with those from unpolluted areas. Different vertical profiles of REE were found in the cores from two stations of polluted areas which indicate that REE may distinguish pollution sources.
Abstract
Neutron activation analysis (NAA) is a very sensitive and accurate multielement analytical method that is widely applied to the investigation of environmental and archaeological problems. The first part of this paper is a review of pollution studies of toxic trace elements in sediments, seawater and marine organisms of Saronikos Gulf, Greece by NAA. The second part of this paper is a review of provenance studies based on minor and trace element research in ancient ceramics, obsidian, flint, limestone, marble and lead by Instrumental NAA, performed at the NCSR Demokritos.
Abstract
Thirty elements were determined by two INAA methods in sediment core samples from N. Saronikos Gulf, Greece, and the results were subjected to multivariate analysis. This procedure resulted in the separation of samples into chemical groups that were environmentally meaningful and sufficient to (a) distinguish among different pollution sources; (b) trace the routes and the extent of pollution in sediments; and (c) define the least affected areas representing the geochemical background. The principal components analysis of the analytical data for 18 selected elements revealed that, among the elements determined in this study, the most discriminating were As, Sb, Ag, Ca, Au, Zn and the rare earth elements (REE).
