No abstract

together with the precipitation of the rare earth oxinates with the lanthanum carrier is at least 97% (S). Because the recovery in either the double oxalate or fluoride precipitation was essentially 100%, the over-all recovery of the rare earths should be about 97%.This value was checked by analyzing duplicate 10-gram samples of beryllium to which was added europium-152-154 after dissolution. An average 98% recovery of the tracer activity was found in the final oxide residue. With larger 28-gram samples, the recovery was 96%.With 40-gram samples of magnesium, the recovery was 96%.Tracer recovery tests were also carried out on duplicate 5-gram samples of zirconium, titanium, uranium, and stainless steel. In the case of uranium, the blank activity of any gammaemitters in the final residue was determined first by carrying an identical sample through the procedure without the tracer addition. The blank was small enough to be ignored. In each case, the recovery of the tracer in the final residues for the spectrographic analysis was at least 97%. LITERATURE CITED(1) Gordon, Louis, Firsching, F. H.,