Geochronology
Geochronology
GChron
Articles | Volume 1, issue 1
Articles | Volume 1, issue 1
https://doi.org/10.5194/gchron-1-17-2019
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/gchron-1-17-2019
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.
Articles | Volume 1, issue 1
Research article
 | 
26 Sep 2019
Research article |  | 26 Sep 2019

Resolving the effects of 2-D versus 3-D grain measurements on apatite (U–Th) ∕ He age data and reproducibility

Emily H. G. Cooperdock, Richard A. Ketcham, and Daniel F. Stockli

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Short summary
(U–Th) / He chronometry relies on accurate grain-specific size and shape measurements. Using > 100 apatite grains to compare assumed 2-D versus true 3-D grain shapes measured by a microscope and X-ray computed tomography, respectively, we find that volume and surface area both differ by ~ 25 % between the two techniques and directly affect mass and concentration measurements. But we found a very small effect on the FT correction (2 %) and no discernible impact on mean sample age or dispersion.
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