Estimated 234U content in DU

The depletion of 234U can be estimated from the depletion of 235U in the following way (credit to Jiri Kolafa):

D(234U) = (1 - 4e)n exp(-4ne) for large n

D(235U) = (1 - 3e)n exp(-3ne) for large n

where e is the single stage enrichment efficiency per 1 kg/kmol mass number difference and n is the number of stages. Eliminating the product ne from these two equations (by taking their logarithm and dividing the results) yields

D(234U) = D(235U)(4/3) = 0.18 for D(235U) = 0.28