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I'm trying to find the separative work units (SWU) required to enrich isotopically Tungsten.

I've come across the SWU equation (http://www.fas.org/programs/ssp/nukes/effects/swu.html)

SWU = P·V(Np) + W·V(Nw) – F·V(Nf)

where

V(x)=(2x-1)ln(x/(1-x))

and x is the concentration

My question is does this equation apply to elements with just two isotopes or will it work for tungsten which has 5 isotopes?

Thank you very much