Trace elements were determined in South West African potsherds by instrumental NAA and by PIXE. The elements for which the
relative spread of concentrations were greatest were selected as indicators. From these the methods of the Minimal Spanning
Tree and of Nonlinear Mapping were used to classify about 60 specimens. Groups were tested by concentration, sum of concentration
and normalized concentration indices. Similar groupings were obtained irrespective of which analytical data or mathematical
techniques was used.
Fifty five samples were analysed for 10 trace elements by INAA. In the absence of identified samples of known origin, similarities
between the samples were established by constructing a minimal spanning tree based on 5 selected elements. Thereafter grouping
was tested using concentration, sum of concentration, and normalised concentration indices. From the results, tentative patterns
of population movement can be deduced.
Authors:M. Peisach, L. Jacobson, G. Boulle, D. Gihwala, and L. Underhill
Data on the concentrations of K, Ca, Ti, Fe, Cu, Zn, Ga, Rb, Sr and Zr obtained by PIXE and of B, F, Na, Mg, Al, Si and Cu
obtained by proton-induced prompt gamma-ray spectrometry were used to characterize archaeological artefacts and source materials
by multivariate analysis. The mathematical approaches employed were cluster analysis using nearest-neighbour data, multidimensional
scaling and correspondence analysis.
Authors:G. Boulle, M. Peisach, W. Dempster, and H. Heese
An investigation was undertaken to measure the trace elements in the blood samples by particle induced X-ray emission (PIXE).
From the measured concentrations an attempt was made to group the blood specimens by pattern recognition methods as a first
step in the search for a possible correlation between the geographical area of domicile and trace elemnt composition. The
trend indicated that children with lower Fe and Br contents were similar in their trace element pattern, were predominantly
from two district, had lower ferritin values and were breast fed longer than the remaining children in the survey.