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AbsmcL A novel experimental technique is used Lo determine accurate relative values of ionization cross sections as a function of electron impact for Na. The ionization efficiency curves are then compared with the recent convergent dosecoupling (e) calculations of Bray which have been very successful in predicting ionization cmss Sections of " i c hydrogen.The present results are also compared with the plane-wave Bom apprommation calculations of McGuire which are expected to be accurale at high eleclron-impact energies (> 500 ev). These comparisons show that at electron-impact energies p a t e r than about 60 eV, inner-shell ionization plays an impoctanI role in N a