Atom Probe Mass Spectrometry of Uranium Isotopic Reference Materials

Analytical Chemistry
Frederick MeisenkothenEric B Steel

Abstract

Atom probe tomography (APT)-based isotopic analyses are becoming increasingly attractive for analysis applications requiring small volumes of material and sub-micrometer length scales, such as isotope geochemistry, nuclear safety, and materials science. However, there is an open question within the atom probe community as to the reliability of atom probe isotopic and elemental analyses. Using our proposed analysis guidelines, in conjunction with an empirical calibration curve and a machine learning-based adaptive peak fitting algorithm, we demonstrate accurate and repeatable uranium isotopic analyses, via atom probe mass spectrometry, on U3O8 isotopic reference materials. By using isotopic reference materials, each measured isotopic abundance value could be directly compared to a known certified reference value to permit a quantitative statement of accuracy. The isotopic abundance measurements for 235U and 238U in each individual APT sample were consistently within ±1.5% relative to the known reference values. The accuracy and repeatability are approaching values consistent with measurements limited primarily by Poisson counting statistics, i.e., the number of uranium atoms recorded.

References

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Aug 30, 2006·Ultramicroscopy·K ThompsonB Gorman
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Aug 25, 2019·Scientific Reports·Elizabeth KautzArun Devaraj
Jun 12, 2020·Ultramicroscopy·Frederick MeisenkothenEric B Steel

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Citations

Jul 29, 2021·Microscopy and Microanalysis : the Official Journal of Microscopy Society of America, Microbeam Analysis Society, Microscopical Society of Canada·Ty J Prosa, Edward Oltman

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Software Mentioned

R
CAMECA Integrated Visualization and Analysis Software ( IVAS )
APT
RStudio

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Related Papers

Microscopy and Microanalysis : the Official Journal of Microscopy Society of America, Microbeam Analysis Society, Microscopical Society of Canada
Frederick MeisenkothenEric B Steel
Journal of Environmental Radioactivity
Albert J FaheySuntharampillai Thevuthasan
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