Abstract

A spectrometric method is described for the direct determination of Dy, Eu, Gd, and Sm in the parts-per-million range in thorium dioxide. The method, based upon a carrier-distillation technique, utilizes silver chloride as a carrier and neodymium as an internal standard. Direct-current arc excitation in an atmosphere of 80% argon-20% oxygen prevents formation of cyanogen band spectra and thereby permits the use of sensitive lines in the regions normally obscured by cyanogen bands. The method fulfills the requirements of precision and sensitivity for specification analysis of reactor-grade thorium dioxide with a time saving of approximately 60%, as compared to conventional methods involving chemical separation.

Energy Transfer between the Sm³⁺, Eu³⁺, Tb³⁺, and Dy³⁺ Ions in Sodium Rare-Earth Tungstates*

W. W. Holloway and M. Kestigian
J. Opt. Soc. Am. 56(9) 1171-1174 (1966)

Multicolor bright Ln³⁺ (Ln = Eu, Dy, Sm) activated tungstate phosphor for multifunctional applications

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New synthetic strategies for luminescent YVO₄:Ln³⁺ (Ln = Pr, Sm, Eu, Tb, Dy, Ho, Er) with mesoporous cell-like nanostructure

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Energy transfer and color-tunable luminescence properties of YVO₄:RE (RE = Eu³⁺, Sm³⁺, Dy³⁺, Tm³⁺) phosphors via molten salt synthesis

Rong Liu, Lijun Liu, and Yujun Liang
Opt. Mater. Express 8(6) 1686-1694 (2018)

Down- and up-conversion of femtosecond light pulse excitation into visible luminescence in cerium-doped Lu₂SiO₅ – Gd₂SiO₅ solid solution crystals co-doped with Sm³⁺ or Dy³⁺

W. Ryba-Romanowski, B. Macalik, and M. Berkowski
Opt. Express 23(4) 4552-4562 (2015)