Chen, J. H. and Wasserburg, G. J.
(1980)
A search for isotopic anomalies in uranium.
Geophysical Research Letters, 7
(4).
pp. 275-278.
ISSN 0094-8276.
doi:10.1029/GL007i004p00275.
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Abstract
The ^(238)U/^(235)U ratios for nine bulk chondritic meteorites and a terrestrial basalt were measured. The total range in ^(238)U/^(235)U determined for both total meteorites and for acid leaches was from 137.2 to 138.3 and to within the error limits indistinguishable from normal terrestrial U. The typical errors in a single determination are ±6‰ (2σ_M) for a 2 ng U sample from a chondrite. Taking the extreme values of δ^(235)U for each measurement the maximum amount of excess ^(235)U that can be allowed to be present ranges from 2 × 10^8 to 2 × 10^9 atoms per gram of bulk meteorite. These results do not support the claims of variations in ^(238)U/^(235)U at the percentage levels or number of excess ^(235)U atoms in some of the same meteorites as reported by several other previous workers.
| Item Type: | Article |
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| Additional Information: | © 1980 by the American Geophysical Union.
Received January 4, 1980; accepted January 28, 1980.
We have benefited from extensive discussion both
Philosophical and scientific with D. A. Papanastassiou. We are grateful to
G. R. Tilton for generously giving us meteorite samples and aliquots of meteoritic U solutions. This work was supported by NSF grant
PHY76-83685 and NASA grant NGL 05-002-188. Contribution 3351
(334) of the Division of Geological and Planetary Sciences. |
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| Funders: | | Funding Agency | Grant Number |
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| NSF | PHY76-83685 | | NASA | NGL 05-002-188 |
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| Other Numbering System: | | Other Numbering System Name | Other Numbering System ID |
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| Caltech Division of Geological and Planetary Sciences | 3351 | | Lunatic Asylum Lab | 334 |
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| Issue or Number: | 4 |
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| DOI: | 10.1029/GL007i004p00275 |
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| Record Number: | CaltechAUTHORS:20131113-151445203 |
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| Persistent URL: | https://resolver.caltech.edu/CaltechAUTHORS:20131113-151445203 |
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| Official Citation: | (1980), Chen, J.H., Wasserburg, G.J.: A search for isotopic anomalies in uranium. Geophysical Research Letters, 7: 275–278. doi: 10.1029/GL007i004p00275 |
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| Usage Policy: | No commercial reproduction, distribution, display or performance rights in this work are provided. |
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| ID Code: | 42437 |
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| Collection: | CaltechAUTHORS |
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| Deposited By: |
Tony Diaz
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| Deposited On: | 13 Nov 2013 23:35 |
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| Last Modified: | 10 Nov 2021 16:23 |
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