Isomeric ratios in (gamma, p) photonuclear reactions have been measured at
energies in the giant-dipole-resonance region. In these measurements, Mo-98
, Ru-100, S-118, and Sn-122, and Sn-122 isotopes have been exposed to brems
strahlung from a microtron. The activation method has been used to measure
the reaction yields. Data obtained in this way have been compared with the
results of calculations based on the statistical model.