Determination of the Isotopic Compositions of Samarium and Gadolinium by Thermal Ionization Mass Spectrometry

H. Hidaka, M. Ebihara, M. Shima

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Because of the large neutron capture cross sections for 149Sm, 155Gd, and 157Gd, accurate and sensitive isotopic analyses of samarium and gadolinium can be used to investigate natural neutron irradiation exposure. In this paper, chemical separation procedures and mass spectrometric methods for the precise determination of samarium and gadolinium isotopic compositions are described. Isotopic ratios other than 144Sm/152Sm, 152Gd/160Gd, and 154Gd/160Gd for both samarium and gadolinium in commercial reagents, artificially neutron-irradiated reagents, and geological reference rocks are quantified within 0.001% precision at the 95% confidence level. The present method can detect effects caused by timeintegrated neutron flux of 1.3 × 1014 neutrons/cm2 in the environmental samples.

Original languageEnglish
Pages (from-to)1437-1441
Number of pages5
JournalAnalytical chemistry
Issue number8
Publication statusPublished - 1995 Jan 1


ASJC Scopus subject areas

  • Analytical Chemistry

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