Empirical correction factors (α-factors) have been determined in the rare earth oxide system. These, together with extrapolated and theoretical α-factors, have been used for analysis of xenotimes, apatites, monazites, and synthetic rare earth oxide mixtures. The standards used are fused pure rare earth oxides. The precision and accuracy obtained, while capable of improvement, are satisfactory for most petrological and mineralogical applications. The empirical α-factors are considered to give better analytical results for yttrium than theoretical α-factors.

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