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Determination of sub-PPB contents of uranium and thorium in high-purity aluminium by RNAA

  • Radiochemical and Radioanalytical Techniques
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Abstract

Aluminium samples, irradiated in a reactor, are dissolved in nitric acid233Pa and239Np are adsorbed on an anion exchange column and then separately eluted. The neptunium fraction is very pure and can be counted in a liquid scintillation counter with ≈100% efficiency. From the other fraction protactinium is extracted by trioctylphosphine oxide and measured by γ-ray spectrometry. With samples of 3 g, a thermal flux of 3·1013 n cm−2s−1 and an irradiation time of 24 hours detection limits are 0.0005 ng/g for U and 0.01 ng/g for Th.

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Authors and Affiliations

  1. Central Division of Chemical Analysis, Research Center Jülich Gmbh (KFA), P.O. Box 1913, D-5170, Jülich, (Germany)

    G. Küppers & G. Erdtmann

Authors
  1. G. Küppers
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  2. G. Erdtmann
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Küppers, G., Erdtmann, G. Determination of sub-PPB contents of uranium and thorium in high-purity aluminium by RNAA. Journal of Radioanalytical and Nuclear Chemistry, Articles 160, 425–434 (1992). https://doi.org/10.1007/BF02037117

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  • DOI: https://doi.org/10.1007/BF02037117

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