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Journal of Radioanalytical and Nuclear Chemistry
Authors: L. Guseva, G. Tikhomirova, G. Buklanov, Zen Phar, I. Lebedev, N. Katargin, and B. Myasoedov

Abstract  

Mendelevium-256 was obtained by irradiating of Bk-249 with Ne-22 ions in the external beam of U-300 cyclotron. An efficient ionexchanging method of medelevium isolation and separation from nuclear reaction products have been developed in which a column with cation exchanger and zinc amalgam and 1M HCl solutions as eluents were used. Under these conditions mendelevium has been shown to be reduced and washed out as an alkaline earth element. The ionic radius of Md2+ has been estimated from a correlation of the elution peak positions with ionic radius of several divalent elements. This value was used to calculate the heat of hydration of Md2+ ion.

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Abstract  

A good separation of the pair Md-Fm was performed on a spheroidal cation exchanger OSTION by means of ammonium -hydroxy--methylbutyrate. The sepation factors and the position of elution peaks for elements of pairs Md-Fm and Ho-Dy are similar.

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Electromigration of carrier-free radionuclides

13. Ion mobilities and hydrolysis of241Am−Am(III) in aqueous inert electrolytes

Journal of Radioanalytical and Nuclear Chemistry
Authors: F. Rösch, T. Reimann, G. Buklanov, M. Milanov, V. Khalkin, and R. Dreyer

Abstract  

The electromigration behaviour of carrier-free241Am–Am(III) in inert electrolytes, =0.1 (C10 4 ), T=298.1(1) K, was studied. On the basis of the overall ion mobilities of241Am–Am(III) on pH between pH 5.5 and 12.9, the stoichiometric hydrolysis constants p 3 3 =23.8(9), and pK1=6.9(2) were obtained. For K4 a limitation of pK4 14.4(3) was possible, because no formation of anionic hydrolysis products in solutions pH12.9 was registered. The individual ion mobility of the241Am–Am3+ decrease in the range pH 5.5–3 from +6.85(15) up to +5.50(15)·10–4 cm2·s–1·V–1. Dependences of this effect on overall ionic strength, inert electrolyte anion, and the temperature of the electrolytes were studied in acidic and neutral solutions.

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Journal of Radioanalytical and Nuclear Chemistry
Authors: Z. Szeglowski, H. Bruchertseifer, V. Brudanin, G. Buklanov, O. Constantinescu, Dinh Lien, V. Domanov, L. Guseva, M. Hussonnois, G. Tikhomirowa, I. Zvara, and Yu. Oganessian

Abstract  

Some short-lived isotopes of Hf, Ta and W, synthesized at the U-400 cyclotron of JINR-Dubna, have been isolated using a previously elaborated fast continuous method of chemical isolation of element 104 from nuclear reaction products. The products were transported by a NaCl aerosol jet, from the irradiated targets to a separation device in which Hf, Ta and W were isolated by using three coupled ion-exchange columns.

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Journal of Radioanalytical and Nuclear Chemistry
Authors: Z. Szeglowski, H. Bruchertseifer, V. Brudanin, G. Buklanov, O. Constantinescu, Dinh Thi Lien, V. Domanov, L. Guseva, M. Hussonnois, G. Tikhomirova, I. Zvara, and Yu. Oganessian

Abstract  

The short-lived isotopes of W and their descendants have been isolated from the products of the bombardment of144Sm with24Mg by a fast continuous ion-exchange method, using HF solution media. The feasibility of this method for isolation of element 106 is discussed.

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