Analytical Applications of X-ray Excited Optical Luminescence
During the past several years, X-ray excited optical luminescences spectroscopy has been found useful in analytical chemistry, particularly for the detection and determination of rare earth impurities in inorganic materials at concentrations in the 1 part in 106 to 109 range. A recent study has shown that one or more of the rare earth elements can be easily detected at the 100 ppm level in compounds of 55 of the chemical elements, when these compounds are incorporated into appropriate phosphors. The advantages of X-ray excitation over other excitation procedures are discussed, and the concept of internal standardization is explained. Analytical procedures for the determination of rare earths in other rare earths, in Zr, Th, U, and the Fe group of transition elements will be briefly described. None of these analytical methods requires prior separation or concentration steps, and the phosphor preparation is simple and rapid.
KeywordsRare Earth Neutron Capture Cross Section Rare Earth Impurity Total Impurity Content Phosphor Preparation
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- 4.R. J. Conzemius, Ames Laboratory, personal communication.Google Scholar