Statistical aspects of variations in hair mineral measurements

Autor:	Todd Saunders, Koichiro Sera, Toshihiro Takatsuji, Yoshiaki Nose, Tomomi Yamada, Koshi Kataoka, Tsuyoshi Nakamura
Rok vydání:	2016
Předmět:	010302 applied physics Observational error Mineral integumentary system 0103 physical sciences Environmental science Mineralogy Particle 010402 general chemistry 01 natural sciences 0104 chemical sciences
Zdroj:	International Journal of PIXE. 26:93-101
ISSN:	1793-6616 0129-0835
Popis:	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.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::d1cf4dc749e58eb9b29f165ecbcdac59 https://doi.org/10.1142/s0129083517500036 Zobrazit plný text záznamu Plný text ve formátu PDF