The L~-, L 2-and L3-subshell ionization cross sections of Au, Pb and Bi by 60 600 keV electron impact have been determined from the measured x-ray production cross sections. The experimental results have been compared with the relativistic PWBA, the Binary Encounter Approximation (BEA) and the Kolbenstvedt Approximation (KA) calculations. These calculations, especially the relativistic PWBA, give good agreement with the experimental data for the L3-subshell. For the L 1-and L2-subshells there are some deviations and these can explain the disagreement observed for the Lt~/L~ and L/L~ intensity ratios.

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