抄録
Minor amounts (0.02 to 0.6%) of rare earth elements (Y, Er, Ho, Gd, Eu and Sm) in dysprosium oxide with high purity were determined by fluorescent X-ray procedure. Samples and standards were prepared by briquetting the oxide powder. Probable errors at a concentration of 0.05% level estimated by a statistical method were 4% (for Y) to 17% (for Sm) for each element. Detection limits of rare earth oxides in dysprosium oxide ranged from 0.005% (for Y) to 0.02% (for Sm).
