ABSTRACT
A method has been developed for the determination of Dy, Eu, Gd, Sm and Th in uranium (after chemical separation) by use of an inductively-coupled argon plasma in conjunction with a direct-reading spectrometer. The method can be used for the determination of Dy and Eu down to 0.02 mug ml , Gd to 0.05 mug ml , Sm to 0.1 mug ml and Th to 0.20 mug ml .
ABSTRACT
An emission spectrographic method using carrier distillation for the determination of the refractory impurities Ta, Hf, Nb, Th, and W in uranium is described. Different carriers, such as Ga(2)O(3), AgCl, AgCl + LiF, and AgCl + NaF in various proportions, were investigated: a 1% NaF + 9% AgCl mixture as carrier at 10% of total charge arced was found to be the most suitable. Spectra were excited in a d.c. arc at 12 A and were photographed with 35-sec exposures. Palladium was used as an internal standard. The lowest limits of determination lie in the range 1-10 ppm for a 100-mg charge. The precision of the method is about 16% or better.
ABSTRACT
An emission spectrographic method for the estimation of rare-earth impurities in plutonium oxide and the mixed oxide (U,Pu)O(2) (30% PuO(2)-70% UO(2)) has been developed. Rare-earth impurities are separated from the matrix by solvent extraction with tri-n-octylamine in xylene and are estimated after concentration. Thulium is used as internal standard and LiF-AgCl as carrier. The spectra are excited in a d.c. arc. The detection limits lie in the range 0.004-0.1 mug and the coefficient of variation ranges from 5 to 23%.