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1673 246-, 318-, 475-, and 540-kev transitions. The counting rates were not high enough to determine if the gamma rays with energies above 700 kev are also in coincidence with this transition.The 0.48-0.54 Mev region of the pulse-height distribution is shown in Fig. 4. The normal pulse-height distribution is plotted in each part of the figure as a solid curve, and the distributions from gamma rays which are in coincidence with the 246-, 318-, and 475kev photopeaks are plotted as dashed curves in (a), (b), and (c), respectively. From these curves one can con-* These investigations were

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