Investigations of the Natural Fission Reactor Program. Progress report, October 1976--September 1977 Page: 4 of 27
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RUTIENIUM MEASUREMENTS OF PERIPHERAL OKLO SAMPLES
Sample U Total Ru Relative 99Ru
Number (wt%) (ng/g) Contenta
KN224 3.1 665 high
KN236 1,5 0.6 % normal
KN241 8.6 40 ti normal
KN244 3.0 n.d. ----
KN255 5.3 850 high
KN258 1.7 19 ti normal
KN266 8.3 35 depleted
KN268 1.0 1,7 ' normal
KN270 12.2 1500 depleted
SCO 3.0 7.5 high
aOf the fission-product
factors of 2 to 3 from
(based on mass yields)
Ru, 99Ru varies by
the expected amount
because of precursor
would be approximately 1. Therefore, for samples KN270 and KN266,
the reactor-product Ru was concentrated preferentially relative to
Tc; for samples KN224, KN255, and SCO, Tc was concentrated relative
to Ru. For the remaining samples, the fission-product ratio of
9Ru/ 01Ru is observed, and we can conclude that Tc and Ru migrated
similarly or that Ru migration occurred more than about 106 yr after
production, when ti 95% of the 99Tc had decayed to 99Ru. There does
not appear to be any spatial correlation of the migration/fixation
behavior for either Tc or Ru,which suggests that mineralogical rathe
than hydrological factors are more important in the behavior of thes
species. Petrographic and U, Nd, and Gd isotopic analyses are
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Apt, K.E. (ed.). Investigations of the Natural Fission Reactor Program. Progress report, October 1976--September 1977, report, November 1, 1977; New Mexico. (https://digital.library.unt.edu/ark:/67531/metadc1057069/m1/4/: accessed April 25, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.