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1.) The uranium ore mined today contains only 0.72% of fissionable 235U, too little to make reactor fuel for thermal-neutron fission. For this reason, the

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1.) The uranium ore mined today contains only 0.72% of fissionable 235U, too little to make reactor fuel for thermal-neutron fission. For this reason, the mined ore must be enriched with 235U. Both 235U (T1/2 = 7.0 x 108 y) and 238U (T 112 = 4.5 x 109 y) are radioactive. a.) How far back in time would natural uranium ore have been a practical reactor fuel, with a 235U/238U ratio of 3.0%

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