Abstract
In recent years, particularly since the development of Ge(Li) "I-ray detectors, nuclear methods have been successfully applied to the measurement of concentrations of many elements in complex environmental samples. The observation of 20-25 elements in a single sample of atmospheric particulate material with instrumental neutron activation analysis is not uncommon. There are, however, a number of elements such as titanium, nickel, arsenic, iodine and lead that are difficult or impossible to measure in typical urban particulates with thermal neutron activation. The elements, along with others which can be determined by neutron activation, are determined readily with high energy photons. Samples were irradiated in the 45-degree facility of the NBS electron linac. The electron energy was 35 MeV and the beam current was approximately 50 l~A. Irradiations were usually conducted for a few hours. After irradiation the samples were counted with a high volume GefLi) detector. The elements Na, C1, Ca, Ti, Cr, Ni, Zn, As, Br, Zr, Sb, I, Ce, Pb, Fe, Se and Rb were observed.
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