Abstract
The objective of this study is to examine the variations in hair mineral concentrations measured by particle induced X-ray emission (PIXE). As the concentrations reflect the historical profile of minerals in blood for a few days to several years, hair mineral measurements vary among the hair strands of a sample as well as the locations on hair strands where PIXE beams are irradiated. PIXE analysis presents not only mineral measurements but also standard errors associated with them due to uncertainty in fitting analysis of X-ray spectrum. We developed statistical methods to decompose the intra-individual variance into the variances due to locations and that due to the fitting analysis. This study describes the results of statistical analysis on the variations in six minerals (Cu, Fe, Sr, Ca, Cl and Pb) and compares the results for better understanding of variations in hair mineral measurements obtained from hair analysis using PIXE.
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