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OKLO phenomena

The Oklo Phenomenon. Naturally occurring uranium consists mainly of and fissionable The isotopic ratio can be calculated from the relative decay rates of the two isotopes. Because decays faster than the isotopic ratio decreases with time. In 1997, the isotopic abundance of 235u... [Pg.315]

The circuin.stances which led to the Oklo phenomenon may well have occurred in other, as yet unidentified, places, but in view of the intervening natural depletion of " U, the possibility of a natural chain reactron being inilrated at the present time or in the future may be discounted. [Pg.1257]

Phenomene d Oklo, Proceedings of a Symposium on the Oklo Phenomenon, International Atomic Energy Agency, Vienna, Proceedings Series, 1975. Natural Fission Reactions, IAEA, Vienna, Panel Proceedings Series STI/PUB/475, 1978, 754 pp. R. West, Natural nuclear reactors. J. Chem. Ed. 53, 336-40 (1976). [Pg.1257]

Ruffenach JC, Menes J, Lucas M, Hagemann R, Nief G (1975) The Oklo Phenomenon. IAEA, Vienna, p 371... [Pg.39]

Oklo phenomenon, 25 397 Okra gum, classification by structure, 4 723t... [Pg.644]

Naudet, R. Renson, C. 1975. Resultats des analyses systematiques de teneurs isotopiques de I uranium. Results of systematio analyses of isotopic content of uranium. In Le phenomena d Oklo—The Oklo phenomenon Internatinal Atomic Energy Agency, Vienna, Austria (AUT). SCHAUBLE, E.A. 2007. Role of nuclear volume... [Pg.250]

We should not leave our discussion of nuclear reactors without mentioning the Oklo phenomenon. In 1972, French scientists analyzing uranium ore from the Oklo uranium mine in Gabon found ore that was depleted in 235U. Further investigation showed the presence of high abundances of certain Nd isotopes, which are formed as fission products. The relative isotopic abundances of these isotopes were very different from natural abundance patterns. The conclusion was that a natural uranium chain reaction had occurred 1.8 billion years ago. [Pg.395]

The Oklo Phenomenon , Proceedings of the Libreville Symposium, international Atomic Energy Agency, Vienna,... [Pg.998]

The Oklo Phenomenon" International Atomic Energy Agency Vienna, 1975. [Pg.296]

B. Mason, C. B. Moore, Principles of Geochemistry, Wiley, New York, 1982 P. K. Kuroda, The Origin of the Chemical Elements and the Oklo Phenomenon, Springer, Berlin, 1982... [Pg.322]

Reuss, P., International Symposium on the Oklo Phenomenon, IAEA-SM-204/10, p. 573. [Pg.109]

Some billion years ago natural nuclear reactors must have operated and generated Tc as a high yield fission product by induced fission of with slow neutrons. The relics of a natural reactor were discovered in 1972 at the Oklo uranium mines in the Republic of Gabon, Africa. lire Oklo phenomenon occurred 1.72 billion years ago and produced a greater amount of Tc than detected in other uranium ores [20. Ruf-fenach et al. [21] reported values of integrated flux of thermal neutrons for the Oklo uranium ores of up to 1. . 2 10 n cm and a atomic ratio down to 0.00410,... [Pg.8]

Maeck WJ, Spraktes FW, Tromp RL, Keller JH (1975) Analytieal results, reeoimnended nuclear constants and suggested eorrelations for the evaluation of Oklo fission produet data Oklo Phenomenon. IAEA, Vienna, p 319-339... [Pg.533]

P. K. Kuroda, Fossil nuclear reactor and plutonium-244 in the early history of the solar system. In IAEA, The Oklo-phenomenon, Viemui, 1976. [Pg.121]

See other pages where OKLO phenomena is mentioned: [Pg.315]    [Pg.1257]    [Pg.182]    [Pg.395]    [Pg.894]    [Pg.24]    [Pg.25]    [Pg.315]    [Pg.96]    [Pg.108]    [Pg.108]    [Pg.1257]    [Pg.9]    [Pg.9]    [Pg.514]    [Pg.538]    [Pg.7039]    [Pg.7205]    [Pg.311]    [Pg.314]    [Pg.20]   
See also in sourсe #XX -- [ Pg.1257 ]

See also in sourсe #XX -- [ Pg.894 ]

See also in sourсe #XX -- [ Pg.894 ]

See also in sourсe #XX -- [ Pg.1257 ]

See also in sourсe #XX -- [ Pg.6 , Pg.894 ]

See also in sourсe #XX -- [ Pg.360 , Pg.361 ]

See also in sourсe #XX -- [ Pg.652 , Pg.1201 ]



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