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Area of Science:

  • Nuclear Chemistry
  • Spectroscopy
  • Environmental Science

Background:

  • Current radiocarbon analysis methods for nuclear waste are slow and not suitable for in situ detection.
  • The behavior of radiocarbon desorbing from graphitic waste requires further investigation.

Purpose of the Study:

  • To develop and demonstrate a rapid, in situ method for radiocarbon analysis in nuclear waste.
  • To quantify radiocarbon concentration and speciation in different waste types.
  • To assess the impact of heating on radiocarbon outgassing.

Main Methods:

  • Utilized mid-infrared cavity ring-down spectroscopy (MIR-CRDS) coupled with an automated sample processing unit.
  • Analyzed gasified solid nuclear waste samples, including spent ion-exchange resin, graphite, and graphite outgassing in sealed crates.
  • Investigated the effect of heating on radiocarbon outgassing and molecular speciation.

Main Results:

  • The MIR-CRDS method demonstrated effectiveness for graphite and gaseous samples.
  • Radiocarbon concentration and molecular speciation were successfully examined.
  • Analysis of spent ion-exchange resin yielded non-repeatable results due to high N2O concentrations.

Conclusions:

  • The developed MIR-CRDS method offers a promising approach for rapid, in situ radiocarbon detection in nuclear waste.
  • The method is suitable for graphite and gaseous waste but requires further refinement for complex matrices like ion-exchange resins.
  • Future applications can include broader sample types and deployment at nuclear facilities.