The uranium ore mined today contains only 0.72% of fissionable ""^(235)U, too little to make reactor fuel for thermal-neutron fission. For this reason, the mined ore must be enriched with ""^(235)U. Both ""^(235)U (T_(1//2) = 7.0 xx 10% y) and ""^(235)U (T_(1//2) = 4.5 xx 10^(9) y) are radioactive. How far back in time would natural uranium ore have been a practical reactor fuel, with a ""^(235)U//""^(235)U ratio of 3.0%?

The uranium ore mined today contains only 0.72% of fissionable ""^(235

1.	The uranium ore mined today contains only 0.72% of fissionable ""^(235)U, too little to make reactor fuel for thermal-neutron fission. For this reason, the mined ore must be enriched with ""^(235)U. Both ""^(235)U (T_(1//2) = 7.0 xx 10% y) and ""^(235)U (T_(1//2) = 4.5 xx 10^(9) y) are radioactive. How far back in time would natural uranium ore have been a practical reactor fuel, with a ""^(235)U//""^(235)U ratio of 3.0%?
Answer» ANSWER :`1.7xx10^(9)y`

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