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Validation of a neutron activation analysis method using k0-standardization.

R N Acharya1, A G C Nair, A V R Reddy

  • 1Radiochemistry Division, Bhabha Atomic Research Centre, Trombay, Mumbai 400 085, India.

Applied Radiation and Isotopes : Including Data, Instrumentation and Methods for Use in Agriculture, Industry and Medicine
|August 31, 2002
PubMed
Summary

This study validates a k0-neutron activation analysis method for multielement quantification. The method accurately determines elemental concentrations in reference materials, showing good agreement with certified values.

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Area of Science:

  • Nuclear Chemistry
  • Analytical Chemistry
  • Materials Science

Background:

  • Neutron activation analysis (NAA) is a powerful technique for elemental quantification.
  • k0-standardization offers a robust method for NAA, reducing reliance on single elemental standards.
  • Implementing k0-NAA requires careful determination of neutron flux parameters and detector efficiency.

Purpose of the Study:

  • To adopt and validate the k0-standardization method for multielement analysis using research reactors.
  • To assess the accuracy and precision of the method by analyzing certified reference materials.
  • To establish the suitability of the developed NAA protocol for routine laboratory use.

Main Methods:

  • Neutron activation analysis (NAA) employing k0-standardization.

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  • Utilized gold as a comparator for flux normalization.
  • Determined key parameters: subcadmium to epithermal neutron flux ratio (f), epithermal neutron flux shape factor (alpha), and detector efficiency (epsilon).
  • Obtained k0-factors and Q0 values from existing literature.

    • Main Results:

    • Elemental concentrations were determined for eight reference materials from USGS, IAEA, and NIST.
    • Measured elemental concentrations showed deviations within +/- 15% compared to certified values.
    • Percent relative standard deviation ranged from 2% to 10% for most analyzed elements, indicating good precision.

    Conclusions:

    • The adopted k0-NAA method is valid and suitable for multielement analysis in the laboratory.
    • The method provides accurate and precise elemental concentration data, comparable to certified values.
    • This work supports the routine application of k0-NAA for elemental analysis in geological and environmental samples.