Energies of the Radiations fromCe144andPr144

With scintillation and magnetic photographic spectrometers the energies of the gamma rays from ${\mathrm{Ce}}^{144}$ have been re-evaluated. Several previously reported gamma rays are believed not to exist, while certain others not reported are found to occur. Gamma energies of 33.4, 40.8, 53.2, 59.0, 79.9, 95.0, 133.5, and 145.2 kev are found. Coincidence measurements together with a consideration of energy relationships indicate a reasonable level scheme for the ${\mathrm{Pr}}^{144}$ nucleus. The energies of the three high-energy gamma rays in ${\mathrm{Nd}}^{144}$ following beta decay of ${\mathrm{Pr}}^{144}$ are 0.688, 1.49, and 2.18 Mev. Some relative intensity measurements are made of the conversion electron lines, leading to a prediction of the multipolarities for three of the gamma transitions. The beta spectrum from ${\mathrm{Ce}}^{144}$ resolves into components with upper energies of 327, 258, and 160 kev. The beta radiation from ${\mathrm{Pr}}^{144}$ has an upper energy limit at 3.12 Mev with a lower energy component whose maximum energy is 0.92 Mev.