作者: J. J. Labrecque , P. A. Rosales , G. Mejias
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摘要: Thirteen elements and eleven rare-earth (La, Ce, Nd, Sm, Eu, Gd, Tb, Ho, Tm, Yb, Lu), as well thorium uranium, were determined in river sediment samples from the Tigre River, Venezuela, by instrumental neutron activation analysis employing a low-energy photon detector. The analyses performed on <63-μm grain size fraction following scheme: one irradiation for only 5 h IVIC's RV-1 nuclear reactor followed three counting periods, approximately one, three, seven weeks after irradiation. This scheme was employed with purpose of being able to routinely analyze many rather than optimize thirteen different element determinations.