[en] A radiochemical method permitting a rapid and efficient isolation of ²²⁸Ac isotope from ²²⁸Ra with a high degree of purity has been suggested. The method is based on Ac coprecipitation with rare earth compounds, gadolinium, in particular. The coprecipitation of the latter in the form of hydroxides is carried out from nitrate solutions by the action of ammonia. 2 refs

[en] The 14 radiochemical conference took place in Marianske Lazne (Czech Republic) in 14-19 April, 2002. Reports on problems of radioecology, radionuclides in environment, chemistry of actinides and transactinides, ionizing radiation in science and technology, chemistry of nuclear fuels and radioactive wastes, nuclear fuel reprocessing were presented

[en] The stabilization forms of ^119m,gTe atoms formed in metallic Sn by the nuclear reaction ¹¹⁷Sn(⁴He, 2n) were studied using Moessbauer spectroscopy. It was found that the stabilization forms of ^119m,gTe are determined by nuclear history (in this case, by the beam currents of bombarding particles) and, as a consequence, by the heat release in the target bulk

[en] Agglomeration process of radioiodine and radiocesium with potassium chloride from steam-gas phase in the conditions of formation of supersaturated vapors of micro- and macrocomponent is investigated. It is shown that as a result of formation of mixed aerosols KCl (¹³⁷Cs, ¹³¹I) encapsulation of radionuclides in matrix of macrocomponent takes place which prevents further transformation of radioiodine in other inorganic and organic forms. This process seems to be perspective for localization of radionuclides near the place of depressurization of fuel elements in the case of accident in nuclear power plants and for hydrophilization of fine-dispersed (with particle size lower then 0.10 μm) aerosols and cesium iodide among them

[en] Method for obtaining free bromenium ions in the gaseous phase by tritium beta-decay in hydrogen bromide composition according to the ³HBr → [³HeBr]⁺ → Br⁺ + ³He scheme is proposed. Separation and identifications of products was carried out by method of high-efficiency liquid chromatography. Bromobenzene and bromotoluene are products of ion-molecular reactions of bromenium free ion with toluene. 4 refs

[en] The process of americium(6) reduction in the 4 mole/l NaOH solution at the 0 deg C temperature under azone influence is studied. The O₃ high concentration creates the O₃^- high content, the decomposition whereof is subjected to the law of the first-order rate. The O₃^- decomposition in accordance with the first-order reaction leads to origination of O₂^-, slightly reacting with Am⁶⁺. The O₃^- decomposition results in H₂O^-which reacts more slowly with O₃, therefore part of H₂O reduces Am⁶⁺. 7 refs

[en] Yields in radioactive chain of ²³⁸U of the following γ-quanta (keV): 63.3 (4.2%), 185.7 (48%), 766 (0.39%), 1001 (1.12%) were determined by the method of semiconductor γ-spectrometry of metal uranium foil. The yields of γ-quanta with 766.6 and 1001 keV energies proved 1.9 times higher than generally accepted ones

[en] Radionuclide phleboscintiscanning (PSS) method using [^99mTc] pertechnetate for investigation into the varicose disease of legs and its relapses is considered. The method allows one to diagnose the form of the disease and visualize the routes of collateral back flow of blood. The method provides for the minimal radial load (0.0021 mSv/MBq)

[en] Physicochemical properties of Ba¹⁴CO₃ obtained both through carbonization of barium-containing solutions and through the drop precipitation method, are studied. Analysis of quantitative characteristics (sedimentation velocity, final volume of residues bottoms, filtration coefficient) showed that for obtaining of barium carbonate with good sedimentation and filtration characteristics it is better to pass through carbon-14 dioxide through the solution of barium hydroxide or its mixture with barium nitrate (not more than 50 mass %), heated up to 60-70 deg C. In case of absorption of carbon dioxide by alkali solution the subsequent Ba¹⁴CO₃ precipitation showed be better conducted by adding in portions the solution of barium hydroxide, chloride or nitrate to the sodium (potassium) solution, heated up to 60-80 deg C. Optimal content of alkali in the carbonate solution equals 50-70 mass %

[en] Behaviour of Np(6) and (5) in ammonium and alkaline solutions in the range of pH 9.3 up to 8 mol/l NaOH during Fe(3) hydroxide precipitation forming as a result of FeO₄^2- reduction by hydrazine or nitroprusside hydrolysis is studied by radiometric method. It is shown that neptunium is coprecipitated with low purification factor. Such behaviour of neptunium deals with formation of anion complexes of Np(5) and these complexes are not contained in the structure of Fe(3) hydroxide and are not adsorbed by precipitate