AbstractGamma-ray spectra from the radioactive decay of140Ba and140La were observed by Ge(Li) spectroscopy. Gamma-ray energies were found to be consistent with literature values, but several of the observed gamma rays were found to have intensities differing significantly from those previously reported. Absolute intensities of prominent gamma rays emitted in the radioactive decay of140Ba and140La have been measured. The 12.8-day140Ba activity was produced by 14.8-MeV neutron fission of238U followed by radiochemical separation and purification.