Cross sections for the elastic scattering of 88.03-keV y rays through 125 by aluminum, gold, lead, and bismuth have been measured with a semiconductor detector. Simultaneously, information has been obtained regarding resonance Raman scattering and Compton scattering in the case of bismuth, and K-shell photoeffect cross sections in the case of gold and lead. Values accurate to about 8%%uo were determined with the help of a normalization technique relying on a comparison with the Compton

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... g counts from the low-atomic-number aluminum target. The elastic scattering cross section of aluminum at the chosen photon energy, which is far above the aluminurn K-shell threshold, is in reasonable accord with form-factor and S-matrix calculations based on the independent-particle approximation. For gold, 7.3 keV above its threshold, the experiment agrees with the S-matrix prediction. However, for lead some 25 eV above threshold, the experimental value is about 40% larger than predicted, while for bismuth (2.5 keV below threshold), experiment lies 70% above theory. The measured K-shell photoeff'ect cross section of lead is within 10%%uo of the prediction based on the independent-particle approximation.