Gamma emission spectra are investigated when excited-state nuclei in a static magnetic field interact with radio frequency (RF) radiation fields. The “dressed” state concept, developed in quantum electronics, is applied to this situation. The nuclear Zeeman levels are coupled by means of a quantized RF-radiation field. The total system consists of the nucleus, the static magnetic field, and the RF-radiation field. The energy levels and corresponding eigenstates of the system are calculated as a function of the frequency of the radiation field and the magnitude of the RF magnetic flux density. Emission spectra are calculated for the 57Fe case as a function of the frequency, the magnitude of the magnetic flux density of the RF-radiation field, as well as the photon emission direction.