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Method for organically bound tritium analysis from sediment using a combustion bomb.

I Vagner1, C Varlam1, I Faurescu1

  • 1Tritium Laboratory, Institute for Cryogenics and Isotopic Technologies - ICS, 4 Uzinei Street, Rm. Valcea, 240050 Romania.

Applied Radiation and Isotopes : Including Data, Instrumentation and Methods for Use in Agriculture, Industry and Medicine
|September 19, 2016
PubMed
Summary

Combustion of sediment with a promoter using a Parr bomb accurately measured tritium levels in estuarine sediment. This method yielded reliable results for environmental monitoring and intercomparison studies.

Keywords:
Liquid scintillation countingOrganically bound tritiumParr bombSediments

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Area of Science:

  • Environmental Science
  • Radiochemistry
  • Analytical Chemistry

Background:

  • Accurate measurement of tritium (radioactive hydrogen isotope) in environmental samples like sediment is crucial for monitoring radioactive contamination.
  • Existing methods for tritium analysis in complex matrices such as sediment can be challenging due to sample preparation and potential interferences.

Purpose of the Study:

  • To present and validate a combustion method for determining tritium in estuarine sediment samples.
  • To assess the reliability of the combustion method using a standard intercomparison exercise.

Main Methods:

  • Combustion of sediment-promoter mixtures in a Parr bomb (type 1121).
  • Optimization of the sediment to promoter ratio (1:3 to 1:2) to ensure complete combustion.
  • Application of the method to an estuarine sediment sample from the 2nd International OBT Intercomparison Exercise.

Main Results:

  • The optimized combustion method achieved complete combustion of sediment samples when the sediment to promoter ratio was maintained between 1:3 and 1:2.
  • The method was successfully applied to analyze an estuarine sediment sample.
  • The average reported tritium value for the intercomparison sample was 163±12 Bqkg⁻¹ dry matter (k=2).

Conclusions:

  • The Parr bomb combustion method is a reliable technique for measuring tritium in estuarine sediments.
  • The method's accuracy was confirmed through participation in an international intercomparison exercise.
  • This technique provides a robust approach for environmental radioactivity assessment.