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Uncertainties in 63Ni and 55Fe determinations using liquid scintillation counting methods.

M Herranz1, R Idoeta, A Abelairas

  • 1Departamento de Ingeniería Nuclear y Mećanica de Fluidos, University of the Basque Country (UPV/EHU), Alda. Urquijo s/n 48013 Bilbao, Spain. m.herranz@ehu.es

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Summary

This study presents methods for determining Nickel-63 and Iron-55 in environmental samples. It analyzes uncertainties in these measurements using separation and liquid scintillation counting techniques.

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Area of Science:

  • Environmental Science
  • Analytical Chemistry
  • Radiochemistry

Background:

  • Accurate determination of radionuclides like Nickel-63 (Ni-63) and Iron-55 (Fe-55) is crucial for environmental monitoring.
  • Method validation, including uncertainty analysis, is a regulatory requirement for environmental laboratories.

Purpose of the Study:

  • To present a comprehensive expression for the uncertainty of Ni-63 and Fe-55 determination.
  • To analyze uncertainties associated with separation methods and liquid scintillation counting.
  • To address uncertainties specific to laboratory practices and operator proficiency.

Main Methods:

  • Development and validation of analytical methods for Ni-63 and Fe-55.
  • Application of separation techniques prior to measurement.
  • Utilisation of liquid scintillation counting (LSC) for radionuclide quantification.
  • Inclusion of standard operating procedures from the Oak Ridge Institute for Science and Education (ORISE).

Main Results:

  • A detailed framework for calculating measurement uncertainty for Ni-63 and Fe-55 was established.
  • Identified key sources of uncertainty, including method variations, laboratory-specific factors, and operator skill.
  • Demonstrated the applicability of the developed methods in an environmental laboratory setting.

Conclusions:

  • The presented uncertainty analysis provides a robust framework for validating Ni-63 and Fe-55 determination methods.
  • Understanding and quantifying uncertainties are essential for reliable environmental radioactivity assessments.
  • Adherence to standardized methods and rigorous validation ensures data quality in environmental radiochemical analysis.