Abstract
An improved method of rock analysis by instrumental neutron-activation analysis is described in which irradiated samples are counted simultaneously using both planar and coaxial Ge detectors. All suitable photopeaks in the 60–1600-keV region of the spectrum are analysed from samples counted within 10 days and again within 30 days after irradiation. Data are presented on the relative sensitivity of individual photopeaks and the precision and accuracy of the technique in routine analysis. New analyses are included for six U.S.G.S. geochemical exploration samples (GXR-1 to GXR-6).
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