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Primary activity standardization of ⁹⁹Tc by three different absolute methods.

Paulo A L da Cruz1, Carlos J da Silva1, Denise S Moreira1

  • 1Laboratório Nacional de Metrologia das Radiações Ionizantes/Instituto de Radioproteção e Dosimetria/Comissão Nacional de Energia Nuclear (LNMRI/IRD/CNEN), Av. Salvador Allende, s/no - Barra da Tijuca, CEP 22783-127, Rio de Janeiro, Brazil.

Applied Radiation and Isotopes : Including Data, Instrumentation and Methods for Use in Agriculture, Industry and Medicine
|December 25, 2013
PubMed
Summary

This study determined the activity concentration of Technetium-99 (99Tc) using liquid scintillation and compared it with traditional methods. Results showed good agreement, validating the triple-to double-coincidence ratio (TDCR) method for accurate radionuclide quantification.

Keywords:
(99)TcClassical coincidenceLive-timed anticoincidenceTDCR

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Area of Science:

  • Nuclear physics
  • Radiochemistry
  • Metrology

Background:

  • Accurate activity concentration determination is crucial for nuclear applications and safety.
  • Traditional methods like 4πβ-γ coincidence counting have limitations.
  • The triple-to double-coincidence ratio (TDCR) method offers a promising alternative for absolute activity measurements.

Purpose of the Study:

  • To absolutely determine the activity concentration of a (99)Tc solution.
  • To compare the TDCR method with established 4πβ-γ coincidence and anticoincidence counting techniques.
  • To assess the consistency and accuracy of different measurement systems for (99)Tc.

Main Methods:

  • Absolute activity determination of (99)Tc using liquid scintillation counting with the TDCR method.
  • Comparison with results from 4πβ(LS)-γ(NaI) live-timed anticoincidence counting.
  • Comparison with results from classical 4πβ(PC)-γ(NaI) coincidence counting, using (60)Co for efficiency tracing.

Main Results:

  • The TDCR method provided an absolute activity concentration for (99)Tc.
  • Anticoincidence and coincidence counting results were higher than TDCR by 0.18% and 0.66%, respectively.
  • All measurement results were consistent within their experimental uncertainties, validating the TDCR method.

Conclusions:

  • The TDCR method is a reliable technique for the absolute determination of (99)Tc activity concentration.
  • The findings support the use of TDCR as an accurate and consistent alternative to traditional coincidence counting methods.
  • This research contributes to improved metrology in radioactivity measurements.