Preparation of Short-life Berkelium Tracers by 241Am(α,xn) or 243Am(α,xn) Reactions

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Application of Copper(II)-di-(2-Ethylhexyl) -Phosphate for Cation-Exchange Extraction from Molten Nitrate Salt(Chemistry)

The H^+-problem, which was pointed out by Foos and Guillaumont on the extraction system between the molten nitrate salt and the chelate or cation-exchange extractant, can be overcome by the use of its metal-salt form as the extractant. And the copper(II)-di-(2-ethylhexyl)-phosphate is effective as the extractant from the molten nitrate mixture. A possible cation-exchange reaction is proposed to explain the above extraction

Production of 167Tm

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Sorption of Plutonium on a Biotite Mineral

It is necessary to obtain the data of some parameters concerning migration behavior of radionuclides in underground water for the safety assessment of radioactive waste disposal. Sorption and desorption experiments were carried out by using tracer amount of plutonium on biotite in a granitic rock. In this study, pH dependence of distribution coefficients of plutonium on a biotite mineral were measured. The following results are obtained; (1) The biotite has the pH buffer capacity at around pH 5. (2) Plutonium sorption rate was fast around pH 6 but slow at lower pH than 5. (3) The 95 percent of plutonium was sorbed on biotite at around pH 5. (4) The 10 to 30 percent of sorbed plutonium in biotite was desorbed with 1N KCl, the 50 to 60 percent with 1N HN0_3. (5) The rest of plutonium sorbed in biotite could not be desorbed even with 1N HN0_3. (6) The neutral plutonyl hydroxide could be an important species sorbed on the biotite.sorptionplutoniumbiotit

Stability Constant of Chloro Complex of Promethium

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A Production of the Promethium Tracers

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Half-life estimation of the first excited state of Th-229 by using alpha-particle spectrometry

To search for a direct-decay signal from the isomer 229Thm, α-particle spectra of 229Thm, g produced from 93 mg of 233U have been measured by using a rapid and high-resolution α-particle spectrometry, which can distinguish α lines of 229Thm from those of its ground state. Although α events were not obtained in the expected energy region for 229Thm with the exception of those derived from 229Thg, we can estimate that the half-life of 229Thm is shorter than 2 h at 3σ confidence level under the chemical condition of chloride or hydroxide