scholarly journals Determination of trace rare earth impurities in lutetium by x-ray excited optical luminescence

1974 ◽  
Author(s):  
John Scott Tritten
Keyword(s):  
Rare Earth ◽  
X Ray ◽  
Optical Luminescence ◽  
Rare Earth Impurities

Determination of uranium in ores by an x-ray excited optical luminescence technique

1977 ◽  
Vol 49 (4) ◽  
pp. 638-641 ◽  
Author(s):  
Arthur P. D'Silva ◽  
Velmer A. Fassel
Keyword(s):  
X Ray ◽  
Optical Luminescence

scholarly journals Determination of the relative concentrations of rare earth ions by x-ray absorption spectroscopy: Application to terbium mixed oxides

1986 ◽  
Vol 47 (4) ◽  
pp. 413-416 ◽  
Author(s):  
G. van der Laan ◽  
J.C. fuggle ◽  
M.P. van Dijk ◽  
A.J. Burggraaf ◽  
J.-M. Esteva ◽  
...  
Keyword(s):  
Rare Earth ◽  
Absorption Spectroscopy ◽  
Mixed Oxides ◽  
Rare Earth Ions ◽  
X Ray ◽  
X Ray Absorption

On the use of x-ray-excited optical luminescence (XEOL) for the analysis of multisite rare-earth systems

1983 ◽  
Vol 78 (3) ◽  
pp. 339-345 ◽  
Author(s):  
Pascal Tola ◽  
Alain Retournard ◽  
Jeannette Dexpert-Ghys ◽  
Marc Lemonnier ◽  
Maurice Pagel ◽  
...  
Keyword(s):  
Rare Earth ◽  
X Ray ◽  
Earth Systems ◽  
Optical Luminescence ◽  
Rare Earth Systems

A Rapid and Accurate X-Ray Determination of the Rare Earths Elements in Solid or Liquid Materials using the Double Dilution Method

1968 ◽  
Vol 12 ◽  
pp. 546-562
Author(s):  
R. Tertian
Keyword(s):  
Rare Earth ◽  
Rare Earth Elements ◽  
Accurate Determination ◽  
Fluorescence Analysis ◽  
Dilution Method ◽  
Practical Advantage ◽  
X Ray ◽  
The Matrix

AbstractThe double dilution method has many important advantages. For any element to be determined, let us say A, It enables us to control or calculate the matrix factor (sum of the absorption end enhancement effects) for the sample being Investigated towards A radiation, and it furnishes corrected Intensities which are strictly proportional to A concentration. Thus the results are exact, whatever the general composition of the sample, their accuracy depending only on the quality of measurement and preparation. Another major practical advantage is that the method does not require systematic calibration but only a few permanent standards consisting of a pure compound or of an accurately known sample.The procedure has been tested successfully for accurate determination of rare earth elements using, for solid materials such as ores and oxide mixtures, the borax fusion technique. It also can be readily applied to liquids. All the rare earth elements can be titrated by that method, as well as yttrium, thorium and, if necessary, all the elements relevant to X-ray fluorescence analysis. The concentration range considered for solids is of one comprised between 0.5 and 100 % and, with a lesser accuracy, between 0.1 and 0-5 % Examples are given relative to the analysis of various ores. Finally it rcust be pointed out that the method is universal and applies to the analysis of every solid, especially ores, provided that they can be converted to solid or liquid solutions. It appears that most industrial analyses can be worked on In this way.

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