Abstract
A general method for the determination of rare earth elements by X-ray fluorescence spectrometry is described. The sample is fused with sodium tetraborate, chromium is added to act as internal control-standard, and the resulting bead is analysed directly. This method overcomes variations in sample form and particle size. Individual rare earths can be determined at levels from 0·1 to 100 per cent., and by using the L spectra and a lithium fluoride 220 crystal, line overlap is kept to a minimum.

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