Activation Analysis of Trace Amounts of Rare Earth in High Purity Tantalum:—Separation of Rare Earth from Tantalum—
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概要
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<I>It is necessary to separate rare earth from tantalum by the rapid methods in order to remove effects of a strong radioactivity and a short half-life. Tantalum is extracted with 10% N-lauryl (trialkylmethyl) amino-benzene pre-equilibrated with a solution of 9M hydrochloric and 0.15M hydrofluoric acid. Non-radioactive rare earth element is added to this aqueous solution, a precipitation of trace amounts of radioactive rare earth in aqueous solution is formed by the addition of rare earth. Some factors for the determination, </I><BR><I>1) the effect of an irradiation position of sample in atomic reactor, </I><BR><I>2) the effect on the extraction with 10%N-lauryl (trialkylmethyl) amino-benzene for radioactive rare earth, </I><BR><I>3) the effect of the concentration of hydrofluoric acid, ammonia water and nitric acid in co-precipitation.</I><BR><I>As a result of investigation of data, we obtained satisfactory results.</I><BR><I>1) Rare earth can be considered that there is no effect in case of the extraction of tantalum with 10%N-lauryl (trialkylmethyl) amino-benzene.</I><BR><I>2) The recovery of rare earth by co-precipitation increases under the condition in which an ammonium ion coexists, and when the concentration of hydrofluoric acid decreases, but a decreasing tendency is seen by the increase of nitric acid concentration.</I><BR><I>3) The time required for the extraction is 9 hours. In case of determination for dysprosium tantalum is extracted with 10%N lauryl (trialkylmethyl) amino-benzene before activation and the time for separation is 2 hours.</I>
- 社団法人 日本アイソトープ協会の論文
社団法人 日本アイソトープ協会 | 論文
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