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Radiochemical isolation and radioactivity calibration of radium-228 by liquid-scintillation counting and gamma-ray spectrometry

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Abstract

Radium-228 was separated from aged thorium nitrate by liquid-liquid, two-phase, extraction and extensively purified, principally by ion-exchange chromatography. The radioactivity concentration of the purified radium-228 was measured by means of liquid-scintillation β-particle measurements of the228Ac daughter (corrected for progeny ingrowth). The results were confirmed by Ge(Li)well-detector intercomparison with radium-228 in equilibrium with its thorium-232 precursor which had been measured gravimetrically. Three hundred ampoules were provided to the U.S. Environmental Protection Agency, Las Vegas, for distribution.

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References

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Author notes

  1. J. R. Noyce

    Present address: Nuclear Environmental Serices Division, Science Applications, Inc., 20850, Rockville, MD

Authors and Affiliations

  1. Radioactivity Group, Center for Radiation Research, National Bureau of Standards, 20234, Washington, DC, (U.S.A.)

    J. R. Noyce & J. M. R. Hutchinson

  2. Physikalisch-Technische Bunde sanstalt, D-3300, Braunschweig, (F. R. G.)

    W. A. Kolb

Authors
  1. J. R. Noyce
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  2. J. M. R. Hutchinson
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  3. W. A. Kolb
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Noyce, J.R., Hutchinson, J.M.R. & Kolb, W.A. Radiochemical isolation and radioactivity calibration of radium-228 by liquid-scintillation counting and gamma-ray spectrometry. J. Radioanal. Chem. 79, 5–13 (1983). https://doi.org/10.1007/BF02518845

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  • DOI: https://doi.org/10.1007/BF02518845

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