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give me answer in 10 min I will rate for sure Nuclear Physics question! In ancient times, Uranium - 235 was 3% when critical, now

give me answer in 10 min I will rate for sure Nuclear Physics question! In ancient times, Uranium - 235 was 3% when critical, now U235 is only 0.7% of natural uranium. the half life of U235 is 7.04 x 10^8 yrs How far back did the criticality occur

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