Relative pair cross sections σp(EγZ) have been measured for energies 1.120, 1.172, 1.333, 1.560, 2.225, and 2.754 MeV and Z = 22, 29, 42, 48, 74, and 82. Results obtained through intensity analysis of annihilation spectra have been normalized to σ(2.754, 82) = 3.30 b/atom.