Abstract
A sensitive procedure for the simultaneous determination of trace levels of iridium, palladium and silver in a platinum stock, by thermal-neutron activation analysis utilizing gamma-ray spectrometry, was developed. The radiochemical-separation scheme involved an elution of the chloro complexes of iridium and silver, and subsequently palladium, through a strongly-basic anion-exchange resin, followed by further chemical-separation methods. The ion-exchange method served to greatly reduce the hazard from radiations emitted by the bulk of the activities in the matrix. Activities of 13.5-hr109Pd, 74.2-d192Ir and 255-d110mAg were monitored by accumulation of pulses from a 3-in diam. NaI(T1) crystal detector. Further discrimination was attained by resolution of decay curves. The procedure provided analyses for a platinum stock of 0.015±0.0021 ppm Ir; 0.028±0.0043 ppm Pd and 2.4±0.27 ppm Ag.
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This work was performed at the Ames Laboratory of the U. S. Atomic Energy Commission, Contribution, No. 2445.
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Cilindro, L.G., Martin, D.S. Neutron activation analysis for iridium, palladium and silver in platinum. J. Radioanal. Chem. 3, 195–204 (1969). https://doi.org/10.1007/BF02513713
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DOI: https://doi.org/10.1007/BF02513713