Total and partial photoionization cross sections, branching ratios, and angular-distribution asymmetry parameters for the 4d, 4p, 4s, and 3d subshells of palladium have been calculated using the relativistic random-phase approximation and the relativistic random-phase approximation modified to include relaxation effects. Comparisons are made between results that include relaxation effects and those that do not. Minor relaxation effects are noted for the 4d and 3d photoionization parameters. However, substantial relaxation effects are noted for both the 4p and 4s subshells. Large relaxation effects are observed in the 4p partial cross section and branching ratio. Also observed is the appearance of a Cooper minimum in the 4s photoionization cross section and a corresponding change in the 4s angular-distribution asymmetry parameter. © 1994 The American Physical Society.