Total attenuation cross sections, total and K-shell photoeffect cross sections, K-jump ratios, and total to K-shell photoeffect cross section ratios at the K-edges of the elements copper, zirconium, silver, tin, tantalum, gold, and lead are extracted from our earlier studies on total attenuation cross sections on these elements. These are compared with the latest and extensively tabulated theoretical photoeffect cross sections of Scofield and agreement within experimental uncertainty is observed. Further, empirical relations for K-edge cross sections and ratios are obtained, and the values of constants in these relations are tabulated. These empirical relations are found to reproduce the values to an accuracy better than one percent.

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Photoelectric cross sections for 52.2 and 84.3 keV photons in Al, Cu, Zr, Ag, Sn, Ta, Au, and Pb are obtained by subtracting the total scattering cross sections from the measured total absorption cross sections. The scattering cross sections are taken from the recent tabulated values of Veigele, for subtracting pulpose. The results are compared with the values interpolated from the theoretical results of (I) Schmickley and Pratt and (2) Scofield. On a obtenu les sections efficaces pour I'effet photoelectrique produit par des photons de 52.2 et 84.3 keV dans Al, Cu, Zr, Ag, Sn, Ta, Au et Pb, en soustrayant les sections efficaces totales de diffusion des sections efficaces totales d'abso~ption mesurees. Les sections efficaces d e diffusion utilisees provenaient des tables d e donnees atomiques recemment compilees par Veigele. Les resultats sont compares avec les valeurs obtenues par interpolation des rtsultats thtoriques de ( I ) Schmickley et Pratt et (2) Scofield.