Abstract
A technique for quantitative neutron-induced autoradiography (NIAR) of human hair samples containing small amounts of plutonium or uranium is described. It requires irradiation of hairs in intimate contact with two thin mica sheets by a suitable dose of thermal neutrons to provide adequate numbers of fission fragments. The technique has been used to examine scalp hair voluntarily provided by 35 humans intermittently exposed to both soluble and insoluble uranium materials. The results indicate that in situations of low intermittent exposure the method is preferable to presently used blood, urine, or whole body monitoring methods. Limitations of the method are discussed.
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