An optical emission spectrographic method has been developed for the quantitative determination of molybdenum, ruthenium, rhodium, palladium, and zirconium in normal uranium metal in the range of 2.5%, 2.0%, 0.30%, 0.20%, and 2.5%, respectively. The precision of the spectrographic method for molybdenum is ±1.0%, ruthenium ±1 8%, rhodium ±1 7%, palladium ±2 1%, and zirconium ±2.2% of the amounts present. The comparison of spectrographic and chemical results on 24 "fissium" alloy samples for molybdenum, ruthenium, rhodium, palladium, and zirconium shows a standard relative deviation from the chemical results of ±3.9%, ±4.3%, ±7.2%, ±6.6% and ±7.5%, respectively. These samples were chosen at random from ingots by using routine sampling procedures.

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