Abstract
A gamma-gamma coincidence technique is applied to the determination of low levels of selenium in NBS standard reference materials, using the /sup 75/Se (n,..gamma..) product. The method is shown to provide accurate determinations in a variety of materials. Removal of interfering ..gamma.. rays at 136 and 264 keV due to /sup 181/Hf and /sup 182/Ta and suppression of Compton background by three to four orders of magnitude are realized by the coincidence counting procedure. Selenium concentrations (..mu..g g/sup -1/) of 0.024, 0.065, 0.084, 0.053, 1.1, 2.6, and 8.8 were determined for SRMs 1570, 1571, 1573, 1575, 1577, 1632, and 1633, respectively. Two sigma Se detection limits were approximately 10 to 20 ng g/sup -1/ for biological reference materials, and 50 to 100 ng g/sup -1/ for fly ash and coal using the conditions reported. 2 tables.
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