Gamma-ray strength functions forRh104,Tm170, andAu198

Gamma-ray spectra following neutron capture in rhodium, thulium, and gold for neutron energies between 0.5 and 3.0 MeV have been measured with a NaI scintillator surrounded by an annular NaI crystal. The $\gamma$-ray strength functions were deduced from the capture $\gamma$-ray spectra by the spectrum fitting method. A bump around 6 MeV is observed for gold as well as a smaller one around 3.5 MeV for thulium. The present results are compared with extrapolations of giant dipole resonance data and measured average total radiative widths.