Determination of thorium by fluorescent x-ray spectrometry

Analytical Chemistry
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A fluorescent x-ray spectrographic method for the determination of thoria in rock samples uses thallium as an internal standard. Measurements are made with a two-channel spectrometer equipped with quartz (d = 1.817 A.) analyzing crystals. Particle-size effects are minimized by grinding the sample components with a mixture of silicon carbide and aluminum and then briquetting. Analyses of 17 samples showed that for the 16 samples containing over 0.7% thoria the average error, based on chemical results, is 4.7% and the maximum error, 9.5%. Because of limitations of instrumentation, 0.2% thoria is considered the lower limit of detection. An analysis can be made in about an hour.

Additional publication details

Publication type Article
Publication Subtype Journal Article
Title Determination of thorium by fluorescent x-ray spectrometry
Series title Analytical Chemistry
Volume 27
Issue 6
Year Published 1955
Language English
Larger Work Type Article
Larger Work Subtype Journal Article
Larger Work Title Analytical Chemistry
First page 1002
Last page 1003
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