MOUND LABORATORY PROGRESS REPORT FOR MARCH 1963 Page: 11 of 24
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It is to be noted that spectrum A of Figure 4, exhibits, in addition to the usual protactinium photopeaks,
the small peaks at 50 and 156 key, characteristic of thorium-227 and radium-223, respectively. The radium-
223 peak (156 kev), however, is attributable largely to growth from thorium-227, since the two spectra of
Figure 4 were recorded approximately one month after the separation. In the gamma spectrum of the filtrate
immediately after separation, the 156 key photopeak was virtually absent.
The results represented by the spectra of Figures 2, 3, and 4 show that, far from being an uncontrollable
nuisance, the hydrolysis of protactinium has a useful application, not only in the separation from its decay
products but in the separation from other impurities as well.
Furthermore, as shown in Figure 4, precipitation at trace levels is not unique to protactinium, but is ex-
hibited, under appropriate conditions, by the alkaline earth elements; in this case, radium-223. It is also
apparent that the hydrolysis of protactinium is not irreversible, since the hydrolyzed protactinium of Figure
2 was completely solubilized by a relatively mild change in the sulfuric acid concentration.
To provide a convenient source of purified protactinium in a solution free of sulfuric acid, the one normal
sulfuric acid solution was passed through a glass wool filter, and the filtrate was discarded. The filter was
washed with distilled water and 0.1 normal nitric acid, and the residual nitric acid was washed away with
distilled water. The protactinium was recovered from the filter in 0.01 normal hydrofluoric acid, ard stored
in a styrene vial.
The method of residue adsorption' was applied to a determination of the relative solubility of protactinium
in various reagents and reagent concentrations.I I I I I I I
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HYDROLYSIS IN 6 N H,SO,
3Kirby. H. W. "Residue Adsorption I. Separation of Strontium-90 and Yttrium-90".
J. Inorg. Nucl. Chem. 25, 483 (1963).9
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Eichelberger, J.F.; Grove, G.R.; Jones, L.V. & Rembold, E.A. MOUND LABORATORY PROGRESS REPORT FOR MARCH 1963, report, March 30, 1963; Miamisburg, Ohio. (https://digital.library.unt.edu/ark:/67531/metadc867731/m1/11/: accessed March 30, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.