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Development of High Precision ^(238)U/^(235)U Ratio Measurements for Cosmochemical Applications

Tissot, F. and Dauphas, N. (2011) Development of High Precision ^(238)U/^(235)U Ratio Measurements for Cosmochemical Applications. In: 42nd Lunar and Planetary Science Conference, March 7-11, 2011, The Woodlands, TX.

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Observations of variations in the ^(238)U/^(235)U ratio at the 0.1‰ level in both terrestrial [1] and meteoritic samples [e.g. 2-5], challenged the assumption of a constant ^(238)U/^(235)U ratio throughout the solar system (SS). The light isotopic compositions measured in some CAIs could be due to the presence of live ^(247)Cm in the early SS as this short-lived radionuclide decays into ^(235)U with a half-life t_(1/2)=15.6Myr. The most immediate consequence of these variations is that the isotopic composition of uranium has to be measured in each CAI to get accurate Pb-Pb ages [5,6]. Given the scale of the variations, achieving high precision measurements is necessary to fully resolve compositional differences between samples and to be able to use the potential of the U isotopic system in terrestrial and extraterrestrial samples.

Item Type:Conference or Workshop Item (Paper)
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URLURL TypeDescription Website
Tissot, F.0000-0001-6622-2907
Dauphas, N.0000-0002-1330-2038
Additional Information:© 2011 Lunar and Planetary Institute.
Record Number:CaltechAUTHORS:20180619-085035219
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:87212
Deposited By: Tony Diaz
Deposited On:19 Jun 2018 16:17
Last Modified:09 Mar 2020 13:18

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