In June 1972, natural fission reactors, which operated billions of years ago, were discovered in Oklo, Gabon At present, natural uranium contains 0 72 235 U How many years ago did natural uranium contain 3 0 235 U, the amount needed to sustain a natural reactor (t for 235 U is 7 04 10 8 years ) ...

To determine how many years ago natural uranium contained 30 235U you can use the concept of radioac ...

In June 1972, natural fission reactors, which operated billions of years ago, were discovered in Oklo, Gabon

Question:

In June 1972, natural fission reactors, which operated billions of years ago, were discovered in Oklo, Gabon . At present, natural uranium contains 0.72% ²³⁵U. How many years ago did natural uranium contain 3.0% ²³⁵U, the amount needed to sustain a natural reactor? (t_½ for ²³⁵U is 7.04 × 10⁸ years.)

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