The variation of trace element concentrations in single human head hairs

Abstract

The concentrations of nine trace elements in segments of individual human head hairs have been determined by neutron activation analysis. Concentration variations have been studied along individual hairs, among hairs plucked from various locations on the scalp, among hairs in different phases of the growth cycle, and before and after hair cleaning. Recent atomic absorption analysis data indicate strong concentration fluctuations in successive single hair segments of 2 to 5 mm in length. The results are discussed in a forensic context.