A fast, precise, and accurate x-ray emission spectrographic method has been developed for the determination of uranium in high-grade (70% to 99% U3O8) uranium concentrates. No chemical separations are required. After acid decomposition, yttrium is added as an internal standard, and the uranium in dilute acid solution is determined by x-ray emission techniques. The standard deviation obtained for the average of the mean by analysis of six portions of the same sample is 0.03% U3O8. Such precision is equivalent to that of the more complicated titrimetric methods conventionally used.

Literature values, ppmRecommended values: 1106 Average value: 18.46 ; 15.7C Average value: 11,36; 9.2d a Mean value x and standard deviation of a single measurement as defined by ( ( -x)2/n -1)1/2. The number n of replicates is given in brackets. 6 F.