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U2O5 Film Preparation via UO2 Deposition by Direct Current Sputtering and Successive Oxidation and Reduction with Atomic Oxygen and Atomic Hydrogen
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Improved Uranium Particle Analysis by SIMS using O3 - Primary Ions.

Evan E Groopman1, Todd L Williamson1, David S Simons2

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Journal of Analytical Atomic Spectrometry
|December 29, 2022
PubMed
Summary
This summary is machine-generated.

Using ozone (O3-) beams in secondary ion mass spectrometry (SIMS) significantly improves uranium particle analysis. This method enhances ionization yield, reduces mass fractionation, and improves measurement precision compared to traditional oxygen (O-) beams.

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Area of Science:

  • Geochemistry
  • Analytical Chemistry
  • Materials Science

Background:

  • Secondary Ion Mass Spectrometry (SIMS) is crucial for isotopic analysis of geological materials.
  • Conventional SIMS uranium particle analysis often uses negative oxygen (O-) primary ion beams.
  • Advancements in ion source technology enable the use of molecular oxygen beams like O2- and O3-.

Purpose of the Study:

  • To evaluate the benefits of negative molecular oxygen primary ion beams (O2-, O3-) for uranium particle SIMS analysis.
  • To compare the performance of O3- beams against conventional O- beams for uranium isotopic measurements.
  • To assess the impact of molecular oxygen beams on ionization yield, mass fractionation, and sensitivity factors.

Main Methods:

  • Utilized negative molecular oxygen primary ion beams (O2-, O3-) in SIMS analyses.
  • Compared O3- beam performance with traditional O- beams for uranium particle analysis.
  • Investigated ionization yield, mass fractionation, and Th/U relative sensitivity factors.

Main Results:

  • Ozone (O3-) beams increased ionization yield by approximately two-fold (up to 4.7%) compared to O- beams.
  • O3- beams reduced instrumental mass fractionation and matrix/substrate effects.
  • Particle measurements using O3- beams showed improved precision and reduced correction factors.

Conclusions:

  • Negative molecular oxygen beams, particularly O3-, offer significant advantages for uranium particle SIMS analysis.
  • O3- beams enhance measurement precision, detection limits, and reduce analytical uncertainties.
  • This advancement improves the reliability of age dating and isotopic analysis of uranium-bearing particles.