Gamma Radiation fromCe144andPr144

Abstract

The gamma radiation following the decay of ${\mathrm{Ce}}^{144}$ and ${\mathrm{Pr}}^{144}$ has been studied with a 4-in. diameter, 4-in. high cylindrical NaI(Tl) crystal, and single-channel and twenty-channel pulse-height analyzers. With the aid of photopeak to total ratios, previously determined for this crystal, the relative gamma-ray intensities have been determined in terms of the 0.134 Mev gamma ray of ${\mathrm{Ce}}^{144}$. If an intensity of unity is assumed for the 0.134-Mev gamma radiation, the photon radiation intensities for the 0.081, 0.696, 1.49, and 2.185-Mev transitions are respectively 0.287, 0.116, 0.023, and 0.059.