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Quantitative analysis of tritiated water using cavity ring-down spectroscopy.

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Area of Science:

  • Spectroscopy
  • Analytical Chemistry
  • Environmental Science

Background:

  • Cavity ring-down spectroscopy (CRDS) is a highly sensitive technique for trace-gas detection.
  • Quantitative tritium analysis using optical methods, particularly CRDS, is underdeveloped.

Purpose of the Study:

  • To demonstrate mid-infrared CRDS for quantitative tritium analysis.
  • To target the fundamental vibrational band of tritiated water (HTO) for enhanced sensitivity.

Main Methods:

  • Utilized mid-infrared CRDS targeting the HTO fundamental vibrational band near 3.5 µm.
  • Experimentally verified the proportional response of CRDS to tritium activity.

Main Results:

  • Achieved substantially improved HTO detection sensitivity compared to previous optical methods.
  • Demonstrated high linearity (R² > 0.99) and excellent repeatability for tritium activity measurements.
  • Assessed practical detection limits considering sample introduction and utilization efficiency.

Conclusions:

  • Established a scalable spectroscopic framework for quantitative tritium analysis using CRDS.
  • The system enables quantitative measurements of microliter-scale samples.
  • Offers potential for rapid tritium assessment in fusion and accelerator facilities and future ultra-high-sensitivity implementations.