Concentrations of As, Cd, Hg, Pb, Sb and Zn have been measured in hair from population groups with varied types of environmental
exposure. Rural and urban controls have exhibited low levels of most toxic elements, whereas people residing near urban lead
refineries, rural gold refinery and other industries have shown high elemental concentrations in their hair. A combination
of instrumental as well as radiochemical neutron and photon activation analysis methods have been used to determine the concentrations
of the above elements. The precision and accuracy of these methods have been evaluated.