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Reliability of Prompt Gamma-ray Analysis for the Determination of Na and Mg in Rock Samples

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Abstract

The reliability of neutron-induced prompt gamma-ray analysis (PGA) was examined for the determination of Na and Mg in geological and cosmochemical rock samples, because they tend to have been erroneously determined for such samples. JB-1 (basalt standard rock) and Allende (chondritic meteorite) powder samples were repeatedly analyzed by using thermal or cold neutron-guided beams of the JRR-3M research reactor at Japan Atomic Energy Agency. In critically evaluating calculated values for major prompt gamma-rays of Na and Mg, it was observed that a 472.2 keV peak for Na and a 2828.2 keV peak for Mg yielded reasonable consistency with corresponding recommended values. Sodium and Mg were determined for five lunar meteorites by PGA using these prompt gamma-rays, and were found to be consistent with their data obtained by instrumental neutron activation analysis.

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Author notes

  1. Yuzuru Karouji

    Present address: Research Institute for Science & Engineering, Waseda University, 3-4-1 Okubo, Shinjuku, Tokyo, 169-8555, Japan

Authors and Affiliations

  1. Department of Chemistry, Graduate School of Science & Engineering, Tokyo Metropolitan University, 1-1 Minami-Ohsawa, Hachioji, Tokyo, 192-0372, Japan

    Yuzuru Karouji & Mitsuru Ebihara

Authors
  1. Yuzuru Karouji
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  2. Mitsuru Ebihara
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Karouji, Y., Ebihara, M. Reliability of Prompt Gamma-ray Analysis for the Determination of Na and Mg in Rock Samples. ANAL. SCI. 24, 659–663 (2008). https://doi.org/10.2116/analsci.24.659

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  • DOI: https://doi.org/10.2116/analsci.24.659

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