The yields provided demonstrate that the various elements examined can be determined with fairly good sensitivity by photonuclear activation analysis using 15 MeV (max) bremsstrahlung. The sensitivities for Pr and Sr are seen to be quite good; those for Nd, Er, and Au good; and those for Y and Ce only fair. Cross sections for the formation of metastable isomers by direct photoexcitation of stable nuclides were computed with respect to the combined intensity of all photons above the energy level of the metastable state.