Oklo: natural fission reactor program. Progress report, April 1-June 30, 1979. [U-Ru dating]
Analyses of samples from the Oklo site have shown that /sup 99/Tc and fissiogenic ruthenium appear to have migrated upwards with respect to the natural fission reactors. This migration was measured over distances of 2 to 10 meters from the reactor zones. The native material of the basal conglomerate was shown not to be a source of the radiogenic Pb incorporated in the stratum. Thus, the radiogenic Pb must have come from the Oklo uranium ore bodies. A sensitive technique was developed for mass spectrometric analyses of ruthenium at the nanogram level. Measurements with this technique permitted validation of a U-Ru age dating procedure by comparison with U-Pb dates from the same ores. Measured yields of /sup 101/Ru, /sup 102/Ru, and /sup 104/Ru from spontaneous fission of /sup 238/U were found to agree with previous estimates. Analyses of two samples from the Morro do Ferro thorium deposit in Brazil cannot be used to define a precise time of ore formation. The data can be used to infer relative migration of thorium with respect to lead during the past 290 x 10/sup 6/ years. 2 figures, 5 tables.
- Research Organization:
- Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
- DOE Contract Number:
- W-7405-ENG-36
- OSTI ID:
- 5887619
- Report Number(s):
- LA-8054-PR; ONWI/Sub-79/E511-01100-7
- Country of Publication:
- United States
- Language:
- English
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Migration and retention of elements at the Oklo natural reactor
Oklo-natural fission reactor program. Progress report, January 1--March 31, 1979
Related Subjects
ISOTOPE DATING
OKLO PHENOMENON
RESEARCH PROGRAMS
RUTHENIUM
ENVIRONMENTAL TRANSPORT
TECHNETIUM 99
LEAD
MASS SPECTROSCOPY
RUTHENIUM 101
RUTHENIUM 102
RUTHENIUM 104
SPONTANEOUS FISSION
THORIUM
TRACE AMOUNTS
URANIUM 238
ACTINIDE ISOTOPES
ACTINIDE NUCLEI
ACTINIDES
AGE ESTIMATION
ALPHA DECAY RADIOISOTOPES
BETA DECAY RADIOISOTOPES
BETA-MINUS DECAY RADIOISOTOPES
DECAY
ELEMENTS
EVEN-EVEN NUCLEI
EVEN-ODD NUCLEI
FISSION
HEAVY NUCLEI
HOURS LIVING RADIOISOTOPES
INTERMEDIATE MASS NUCLEI
ISOMERIC TRANSITION ISOTOPES
ISOTOPES
MASS TRANSFER
METALS
NATURAL NUCLEAR REACTORS
NUCLEAR REACTIONS
NUCLEI
ODD-EVEN NUCLEI
PLATINUM METALS
RADIOISOTOPES
REFRACTORY METALS
RUTHENIUM ISOTOPES
SPECTROSCOPY
STABLE ISOTOPES
TECHNETIUM ISOTOPES
TRANSITION ELEMENTS
URANIUM ISOTOPES
YEARS LIVING RADIOISOTOPES
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