Abstract
Chemical and physical methods are described for estimating zinc in biological tissues by means of neutron activation analysis. Small enamel samples weighing approximately 20 mg were taken from the outer and inner layers of permanent human teeth and irradiated in a reactor at a thermal neutron flux of 10 12n/cm 2/sec. A standard zinc sample was irradiated for a similar period. The results showed that zinc was present in all enamel samples and ranged from 58 to 1550 ppm. Greater concentrations of zinc were found in the outer enamel layer than in the inner. Satisfactory agreement of results was found between the chemical and instrumental methods.
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