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F-Po M <br />CAhPc o <br />.. Rtpapr <br /> <br />TABLE 2.. COMPOSITION OF THE <br />OXIDE 20711-26 <br />Weight % MONAZITES. <br />20711-28 <br />Weight $ <br />ThO2 3.8 5.0 <br />UO22 1.8 2.5 <br />Ca0 2.2 2.7 <br />La203 15.6 14.5 <br />Ce203 25.3 21.3 <br />Pr203 2.* 3.* <br />Nd203 14.3 12.8 <br />Sm 03 <br />8 6.1 5.8. <br />P2 <br />5 27-29 27-29 <br />Total 98.1-100.1 94.6-96.6 <br />*Ce and Nd'overlap Pr so much that' the amount <br />shown is only approximate.. <br /> 4 <br />TABLE 3. RARE EARTH CONCENTRATION IN IRIDIUM <br />OXIDE WEIGHT $ <br />Gd203 2.9 <br />DY203 3.5 <br />Ho203 1.8 <br />Er203 3.* <br />Yb203 3.5 <br />Total <br /> 14.7 <br />Note: Due to possible excitation <br />by Iridium radiation, these values <br />are probably maximum ones. <br />*Due to overlap, Er value is <br />only approximate.