  A plasma based isotopic separation method is proposed. Isotopes of different
masses get separated during plasma expansion. Relying on Gurevichs
(A.V.Gurevich, L.V.Pariiskaya and L.P.Pitaevskii, Sov.Phys.JETP, 36,274 (1973))
plasma expansion into a vacuum model, the enrichment factor has been
calculated. For t =15 (t being the normalized time), an increase of the
relative abundance of 30% is expected.
