The trace element composition of human hair is a suitable indicator of exposure to trace element pollutants. During the implementation
of an international research programme, coordinated by the IAEA, on the use of nuclear methods for detecting trace element
pollutants in hair, much valuable information was collected both on normal levels of trace elements and on increased levels
caused by pollution. As a result of reviewing and comparing the data, interesting observations relating to the spread of concentrations
were made. Standardized procedures were elaborated for a number of analytical techniques as well as for pre-analytical preparations
in the analysis of hair.