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This summary is machine-generated.

Tritium activity loss in plastic vials may be due to hydrogen exchange with the plastic. Testing confirmed increased tritium in deionized water stored in plastic vials, suggesting H and H atom exchange.

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Area of Science:

  • Radiochemistry
  • Materials Science

Background:

  • Low-energy beta particle detection often uses liquid scintillation counting (LSC) for tritium samples.
  • Observed faster-than-expected tritium loss in plastic scintillation vials necessitates further investigation beyond sample diffusion or cocktail degradation.

Purpose of the Study:

  • To investigate the hypothesis that tritium organically binds to plastic vial materials via hydrogen-hydrogen atom exchange.
  • To quantify tritium activity changes in plastic versus glass vials over time.

Main Methods:

  • Tritiated water was stored in plastic and glass vials.
  • Deionized water was introduced into previously used plastic vials to detect reverse atom exchange.
  • Tritium activity concentration was measured over time in both scenarios.

Main Results:

  • Plastic vials showed greater tritium activity concentration loss compared to glass vials.
  • Tritium activity concentration increased in deionized water stored in plastic vials, indicating transfer from the vial material.
  • No such increase was observed when deionized water was stored in glass vials.

Conclusions:

  • The study provides evidence supporting hydrogen-hydrogen atom exchange between tritiated water and plastic vial materials.
  • This mechanism offers a potential explanation for observed tritium losses during LSC sample storage in plastic vials.