Neutron activation determination of noble metals in rocks: A rapid radiochemical separation based on tellurium coprecipitation |
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| Authors: | H. W. Stockman |
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| Affiliation: | (1) Massachusetts Institute of Technology, Cambridge, Massachusetts, (U. S. A.);(2) Present address: Division 1541, Sandia National Laboratoires, 87185 Albuquerque, NM, USA |
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| Abstract: | A procedure is described for the determination of Pd, Au, Ir, and Pt in rocks at the ppb concentration level. After irradiation with thermal neutrons, powdered rock samples are fused with carriers and Na2O2−NaOH. The fusion cake is dissolved in dilute HCl, and the activated noble metals and carriers are coprecipitated as a group with Te, using Sn2+ as a reductant. Gamma and X-rays are counted on semi-conductor Ge deterctors. Yields are determined by reirradiation. Results are given for several rocks, including U.S.G.S. standards PCC-1 and W-1. |
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