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Concentration of 63 Cu by the countercurrent electromigratipn method ie described. The electromigration cell was operated with cupric sulfate as the electrolyte for periods of about 400 to 500 hours. A definite, though small, concentration of 63 Cu in the cathode compartment of the cell was obtained. The terminal separation coefficient was about onethird as large as that found for chlorine under similar conditions.

Concentration of copper 63 by the countercurrent electromigration method