Journal ArticleDOI
Evidence of fissiogenic Cs estimated from Ba isotopic deviations in an Oklo natural reactor zone
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In this paper, the fissiogenic isotopic composition of Ba isotopes has been investigated and a good correlation between the elemental abundance of Cs and isotopic abundances of excess 135 Ba and 137 Ba suggests that fissileogenic 135 Ba, 137 Ba behaved as Cs rather than Ba.About:
This article is published in Earth and Planetary Science Letters.The article was published on 1993-01-01. It has received 34 citations till now. The article focuses on the topics: Oklo.read more
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Natural fission reactors in the Franceville basin, Gabon: A review of the conditions and results of a “critical event” in a geologic system
TL;DR: In this paper, the behavior of the actinides and fission products stored in a geological environment for more than 2.0 Ga years has been studied in two uranium deposits in the world, the Oklo and Bangombedeposits of the Franceville basin.
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Barium isotope fractionation in the global barium cycle: First evidence from barium minerals and precipitation experiments
TL;DR: In this paper, the stable barium (Ba) isotope fractionation in the natural barium cycle has been investigated and the observed natural discriminations are clearly larger than the analytical uncertainty of the stable isotope measurements.
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Barium isotopes in individual presolar silicon carbide grains from the Murchison meteorite.
Michael R. Savina,Andrew M. Davis,C. Emil Tripa,C. Emil Tripa,Michael J. Pellin,Robert N. Clayton,Roy S. Lewis,Sachiko Amari,Roberto Gallino,Maria Lugaro +9 more
TL;DR: Barium isotopic compositions of single 2.3-5.3 μm presolar SiC grains from the Murchison meteorite were measured by resonant ionization mass spectrometry.
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High-precision barium isotope measurements by MC-ICP-MS
TL;DR: In this paper, a high precision method to measure Ba isotopes by MC-ICP-MS was presented, where Barium is separated from matrices by using a cation exchange resin (AG50W-X12, 200-400 mesh).
References
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Geochemical aspects of radioactive waste disposal
TL;DR: In this article, an attempt is made to cover some background material on radioactive wastes and geotoxicity that may not be an integral part of a geologist's training, and background materials on geology and geochemistry for the nuclear scientist.
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Humics and Radionuclide Migration
TL;DR: In this paper, the authors discuss the properties of humic molecules and their role in the migration of radionuclides in geologic media, including the strong complexing and redox interactions of the humic materials to metal ions.
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Isotopic analyses of barium in meteorites and in terrestrial samples.
TL;DR: In this paper, the double spike dilution technique was used to correct for laboratory fractionation of barium isotopes in six stone meteorites and the silicate inclusions of two iron meteorites.
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Organic matter and containment of uranium and fissiogenic isotopes at the Oklo natural reactors
Bartholomew Nagy,François Gauthier-Lafaye,Philippe Holliger,D. W. Davis,David J. Mossman,Joel S. Leventhal,Mark J. Rigali,John Parnell +7 more
TL;DR: In this article, it was shown that uraninite crystals were held immobile within the resolidified, graphitic bitumen at Oklo in Gabon, and that the use of hydrophobic solids as a means of immobilizing radionuclides in pretreated nuclear waste warrants further investigation.
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Fission product retention in the Oklo natural fission reactors
David B. Curtis,Timothy Benjamin,Alexander Gancarz,R.D. Loss,Kevin J.R. Rosman,John R. DeLaeter,James E. Delmore,William J. Maeck +7 more
TL;DR: In this article, a planar cross section of one of the natural fission reactor zones at the Oklo U mine was analyzed to determine the abundances and isotopic composition of U, Mo, Ru, Pd, Ag, Cd, Sn, Te and Nd.