NDLI: Fission yields of molybdenum in the Oklo natural reactor

Content Provider	Springer Nature Link
Author	Wieser, M. E. Barry, S. Laeter, J. R.
Copyright Year	2012
Abstract	The isotopic compositions of molybdenum in six uranium-rich samples from the Oklo Zone 9 natural reactor were accurately measured by thermal ionization mass spectrometry. The samples were subjected to an ion exchange separation process that removed the isobaric elements zirconium and ruthenium, with high efficiency and a low blank. Molybdenum possesses seven isotopes of which $^{92,94,96}$Mo are unaffected by the fission process, enabling the raw data to be corrected for isotope fractionation by normalising to $^{92}$Mo/$^{96}$Mo, and to use $^{94}$Mo to correct for the primordial component in each of the fission-produced isotopes. This enables the relative fission yields of Mo to be calculated from the isotopic composition measurements, to give cumulative fission yields of 1:0.941:0.936:1.025 for $^{95,97,98,100}$Mo, respectively. These data demonstrate that the most important nuclear process involved in reactor Zone 9 was the thermal neutron fission of $^{235}$U. The consistency of the relative cumulative fission yields of all six samples from different locations in the reactor, implies that Mo is a mobile element in the uraninite comprising Zone 9, and that a significant fraction of molybdenum was mobilized within the reactor zone and probably escaped from Zone 9, a conclusion in agreement with earlier published work.
Starting Page	949
Ending Page	954
Page Count	6
File Format	PDF
ISSN	02365731
Journal	Journal of Radioanalytical and Nuclear Chemistry
Volume Number	293
Issue Number	3
e-ISSN	15882780
Language	English
Publisher	Springer Netherlands
Publisher Date	2012-05-05
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Fission yields Isotopic composition Mobility/retentivity Molybdenum Oklo natural reactors Physical Chemistry Diagnostic Radiology Nuclear Physics, Heavy Ions, Hadrons Nuclear Chemistry Inorganic Chemistry
Content Type	Text
Resource Type	Article
Subject	Spectroscopy Pollution Health, Toxicology and Mutagenesis Radiology, Nuclear Medicine and Imaging Analytical Chemistry Public Health, Environmental and Occupational Health Nuclear Energy and Engineering

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