Power Plant Engineering
In natural uranium, the constituents of three naturally occurring isotopes are

U₂₃₄ = 0.006%, U₂₃₅ = 0.712% and U₂₃₈ = 99.282%
U₂₃₄ = 99.282%, U₂₃₅ = 0.006% and U₂₃₈ = 0.712%
U₂₃₄ = 0.712%, U₂₃₅ = 0.006% and U₂₃₈ = 99.282%
U₂₃₄ = 0.006%, U₂₃₅ = 99.282% and U₂₃₈ = 0.712%

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Power Plant Engineering
Enriched uranium is one in which

Percentage of U₂₃₅ has been artificially increased
Percentage of U has been artificially increased
Extra energy is pumped from outside
Percentage of U₂₃₄ has been artificially increased

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