Mr
Jan Krmela
(KJCH FJFI CVUT)
4/22/10, 12:00 PM
Separation Methods, Speciation
Poster
Europium is often used as a model of the fission products from the lanthanides and minor actinides group. Glycolic acid is used in modern decontamination solutions and has been also proposed as a complexing agent in the reprocessing of spent nuclear fuel.
The aim of this study was to carry out a more detailed study of europium complexation with glycolic acid using Time-Resolved Laser-Induced...
Dr
Zeljko Grahek
(Rudjer Boskovic Institute)
4/22/10, 12:00 PM
Separation Methods, Speciation
Poster
55Fe is an activation product, low energetic beta emitter with approximately 2,74 year half life. Therefore, its presence in natural systems is limited in time and mainly dependent on nuclear reactor operation. As a rule determination of 55Fe require chemical separation prior detection. For this purposes separation on anion exchange column in two steps is usually used which makes it...
Dr
Andrea Sabatié-Gogova
(Laboratoire Subatech (CNRS/IN2P3 / Ecole des Mines de Nantes / Université de Nantes))
4/22/10, 12:00 PM
Separation Methods, Speciation
Poster
Astatine (At, Z=85: [Xe]4f145d106s26p5) is below iodine and belongs to the halogen group. One of its isotopes, 211At, is a promising candidate as a therapeutic agent in nuclear medicine [1].
It has been reported that astatine presents a metal-like behavior when existing under the oxidation states +I and +III as At+ and AtO+ species [2]. However, the number of studies dealing with the...
Mr
Ota FIŠERA
(VOP-026 Šternberk, s. p., division VTÚO Brno)
4/22/10, 12:00 PM
Separation Methods, Speciation
Poster
The aim of this study was suggestion and examination of method for radioanalytical determination of 59-Ni in radioactive wastes using low energy photon spectrometry (LEPS). New composite material PAN-DMG, containing chelating agent dimethylglyoxime (DMG) immobilized in porous matrix of binding polymer polyacrylonitrile, was used for nickel separation and concentration. Method for preparation...
Mr
Jiří Janda
(NBC Defence Institute, University of Defence)
4/22/10, 12:00 PM
Separation Methods, Speciation
Poster
This method describes electrodeposition of selected group of alpha-emitting radionuclides such as method suitable for measuring by means of solid-state alpha spectrometry. The effect of volume and pH of electrolyte, distance of electrodes, current and plating time versus different alpha-emitting radionuclides was observed in order to optimize conditions to obtain maximum yield.
Ms
Jixin Qiao
(Radiation Research Division, Risø National Laboratory for Sustainable Energy, Technical University of Denmark, DK-4000 Roskilde, Denmark)
4/22/10, 12:00 PM
Separation Methods, Speciation
Poster
Fractionation of plutonium isotopes (238Pu, 239,240Pu) was conducted for environmental samples including soil and sediment, and bio-shielding concrete from decommissioning of nuclear reactor in this work. The fractionation were carried out by dynamically sequential extraction system using an on-line sequential injection (SI) combined with a specially designed extraction...
Kamila Šťastná
(CTU in Prague, FNSPE, centrum pro radiochemii a radiační chemii;FJFI katedra jade)
4/22/10, 12:00 PM
Separation Methods, Speciation
Poster
Because of the energy loss of alpha particles by self-absorption, alpha spectrometry requires thin, uniform, and nearly weightless samples. Several methods exist for sample preparation e.g., electrodeposition, or co-precipitation. Unfortunately, the methods yielding the best energy resolution are not always quantitative and are usually relatively demanding and time-consuming. This fact makes...
Dr
Martina Rozmaric Macefat
(Rudjer Boskovic Institute)
4/22/10, 12:00 PM
Separation Methods, Speciation
Poster
Strontium, plutonium and americium are isotopes which determination is most often in practice (from all among alpha and pure beta emitters) because of their radiotoxicity, long period of half life and potential hazardous for human life. It is well known that their determination, because of radiochemical properties, require isolation from sample and separation from other elements (active or...
Mr
Ilia Volkov
(Instotute of solid state chemistry, UB RAS)
4/22/10, 12:00 PM
Separation Methods, Speciation
Poster
By using the method of solubility it is shown that long (15 days) exposure of monazite powder in the aqueous solutions of natural or synthetic humic acids (HA) give rise to 10 to 100 times more high solubility of heavy p-, d- и f-elements of Periodic system of D.I. Mendeleev in comparing with humic-less solutions. The level and rate of the solubility is shown to depend on the initial...
Dr
Alena Tokárová
(-)
4/22/10, 12:00 PM
Separation Methods, Speciation
Poster
Solvent extraction was described for the analytical determinition of the americium in the liquid samples. Arylesters of imidodiphosphoric, imidothiodiphosphoric, imidodithiodiphosphoric acids and tetraphenylimidodithiodiphosphine were used as representatives of bidentate organophosphoric chelating agents. Pentaphenyldiimidotriphosphate, from the group of tridentate agents, was used. The...
Jiří Mizera
(Nuclear Physics Institute, Academy of Sciences of the Czech Republic)
4/22/10, 12:00 PM
Separation Methods, Speciation
Poster
The study has been aimed at development of cheap sorbents of toxic heavy metals and radionuclides based on low rank, low energetic coals in combination with chitosan for use in treatment of both waste and drinking water and construction of active geochemical barriers. Sorbents based on lignite and naturally oxidized lignite (oxihumolite, leonardite) were prepared, both raw and impregnated with...
Filip Kužel
(CTU in Prague)
4/22/10, 12:00 PM
Separation Methods, Speciation
Poster
Application of solid extractants containing di-(2-ethylhexyl)phosphoric acid (HDEHP) in the support based on modified polycrylonitrile (PAN) has been proposed at the CTU in Prague, Department of Nuclear Chemistry, for the determination of 90Sr by means of measuring the activity of its 90Y daughter utilising a procedure similar to that developed by Burnett et al. in 1975...
Prof.
Alexandru Cecal
("Al.I. Cuza" University, Faculty of Chemistry)
4/22/10, 12:00 PM
Separation Methods, Speciation
Poster
The variation of the concentration of U(IV) and U(VI) species from uranium ores due to the alpha-radiolysis induced by an Am-241 source in several deposit conditions is studied. The X-rays patterns show some differences for the studied ores before and after external alpha-radiolysis. The concentrations of U(IV) and U(VI) species was determined spectrophotometrically.
308.
The liquid-liquid extraction of minor actinides with CyMe<sub>4</sub>-BTBP in selected diluents
Mr
Petr Distler
(CTU in Prague)
4/22/10, 12:00 PM
Separation Methods, Speciation
Poster
The CyMe4-BTBP (6,6’-bis(5,5,8,8-tetramethyl-5,6,7,8-tetrahydro-1,2,4-benzotriazine-3-yl)-2,2’-bipyridine) has been demonstrated to be a prospective extractant for the liquid-liquid extraction of minor actinides. For industrial applications, its solubility in 1-octanol is low and the kinetics of extraction in this diluent is slow. Better performance has been demonstrated in...
barbora Drtinova
(CTU Prague)
4/22/10, 12:00 PM
Separation Methods, Speciation
Poster
Uranyl-sulphate complexes are the most significant U(VI) species in acid solutions containing sulphate ions. The study of their properties is of practical significance for characterisation of solutions used in underground uranium ore leaching and following remediation of leaching sites. At low pH values, the speciation of U(VI) mainly depends on its total concentration [UVI] and sulphate ions...
Dr
Kallola Kumar Swain
(Bhabha Atomic Research Centre, Mumbai - 400085, India)
4/22/10, 12:00 PM
Separation Methods, Speciation
Poster
Arsenic contamination of drinking water has been reported from many parts of the world. The maximum permissible level of total arsenic in drinking water is 10 microgram L-1 as recommended by WHO. Natural geochemical contamination through soil leaching is the primary contributor of dissolved arsenic in ground water around the world. The most common species present in water are the inorganic...
Dr
Dmitri Davydov
(Joint Institute for Power and Nuclear Research)
4/22/10, 12:00 PM
Separation Methods, Speciation
Poster
Behaviour of radionuclides in such processes as sorption, ion-exchange, ultrafiltration, etc., that are used for removal of radionuclides from solution, is largely determined by their speciation in solution. The hydrolysis of metal ions in solution is particularly interesting in that respect, since most of the liquid radioactive wastes are aqueous solutions.
The following forms of...
