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Using monochromatic photons from (n, y) and (p, y) capture reactions, the elastic scattering of photons was studied in the mass range A =181-238 and energy range E =8-18 MeV. It is shown that the A dependence of the enhancement of El strength located in the giant-dipole resonance as revealed by part of the 'photoneutron cross sections is confirmed by our photon-scattering data. The possibility is discussed that the concentration of E1 strength in the giant dipole resonance may be larger for closed-shell nuclei as compared to open-shell nuclei.