The separation and purification of americium-241 (25 mg.), produced by the @-decay of plutonium-241 in plutonium containing small amounts of the latter isotope, is described.The absorption spectra of americium(rr1) in perchloric acid and in hydrochloric acid have been measured. The narrow 504-mp peak does not obey either Beer's or Lambert's law ; the 814-mp peak obeys both.By following changes in the absorption spectra the disproportionation and self-reduction of americium(v) in hydrochloric acid have been observed. Self-reduction is caused by reducing materials produced in solution by a-particle bombardment. In low acid concentrations only self-reduction occurs, but in more concentrated acid solutions disproportionation predominates.
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