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Key terms: abundance ago alpha billion years chain reaction concentrations conditions constant decay discovered earth fission fission product gabon groundwater isotope isotope signatures long lived mass math mineral deposit natural natural nuclear natural nuclear fission natural nuclear reactor nd neodymium neutron nuclear nuclear chain nuclear fission nuclear reactions nuclear reactor occurred oklo ore bodies oxygen radioactive reaction reactor ruthenium samples showed sm stopped sup thermal neutrons uranium uranium ore waste Search external links cited by footnotes on Wikipedia page Natural nuclear fission reactor: |
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