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  • Author or Editor: J. Krtil x
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Abstract  

A method of137Cs isolation from strongly, acidic solutions of fission products is described, in which vanadyl ferrocyanide is used as a selective ion exchanger for cesium. The effects of the acidity of medium and the carrier concentration on the quantitative yield of separation have been studied and convenient conditions have been found for137Cs isolation from the solution of fission products formed after irradiating uranium with neutrons.

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Abstract  

The extraction of Cs and Sr into nitrobenzene in the presence of complex of arsenic acid and catechol is described. The dependence of distribution ratio of Cs and Sr on the concentration of HNO3, NH4NO3, NaNO3, and the reagent concentration were determined. On the basis of these results a probable mechanism of Cs and Sr extraction was suggested.

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Abstract  

The paper describes a radiometric variant of the two-phase titration method for the determination of anionic surfactants of nonsoapy type. The method is based on the titration of an anionic surfactant with Septonex in alkaline medium in the presence of131I-Rose Bengal /abbreviated131I-RB/. The ion associates are extracted into chloroform. The equivalence point is determined graphically from the activity of131I-RB-Septonex associate, which is formed after the consumption of the anionic surfactant and which passes into the organic phase. The influence of131I-RB amount, pH of the titrated medium and of soap presence on the precision of anionic surfactants determination was studied. The detection limit is 2.88 g sodium n-dodecylsulphate in 10 ml of sample.

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Abstract  

The experience with the determination of plutonium and uranium in the samples of nuclear fuel obtained during a 10-years period of the activity of the Central Control Laboratory of the Nuclear Research Institute at e is evaluated. The paper describes the principles of the methods used and the reproducibilities and accuracies of the results obtained with the aid of the titrimetric methods used for the determination of plutonium and uranium.

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Abstract  

The paper describes an extraction radiometric method for the determination of Rose Bengal content in the radiopharmaceutical preparations of Rose Bengal labelled with131I. Two methods have been studied. The first one is based on the addition of an excess and substoichiometric amounts of Septonex /carbetoxypentadecyltrimethylammonium bromide/ to the sample of Rose Bengal-131I and on the activity measuring of the chloroform extracts. The second method is based on the extraction of Rose Bengal-131I with substoichiometric amount of Septonex from the sample of Rose Bengal-131I and the sample of Rose Bengal-131I diluted with a known amount of an inactive Rose Bengal preparation.

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Abstract  

A radiometric method, for the determination of PEG-1000 based on the extraction of an associate Ba2+-PEG-chlorinated dicarbolide anion /[/C2B9H8Cl3/2Co], further abbreviated BCl/ into a mixture nitrobenzene + chloroform /41/, has been alaborated. The activity of133Ba which is used as a radioactive indicator, is proportional to the PEG-1000 concentration in the sample. The optimum conditions for the determination of PEG-1000 /e.g. the acidity of the solution, the barium concentration, the concentration of the extraction agent etc./ have been studied in detail.

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Abstract  

The paper describes experience concerning the determination of uranium in nuclear fuels by mass-spectrometric isotope dilution analysis. As a spike, the solution of233U was used. The method was applied to the uranium content determination in non-irradiated and irradiated samples of nuclear fuels.

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Abstract  

The Rose Bengal forms with cationic surfactants /1-carbethoxypentadecyltrimethyl-ammonium bromide, cetyltrimethylammonium bromide and cetylpyridinium bromide/ the extractable ion associates with composition 11 or 12. The extraction constants of the ion associates of the Rose Bengal with cationic surfactants were determined radiometrically with the aid of Rose Bengal labelled with131I.

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Abstract  

An extraction chromatographic method is described for the determination of cerium in a fission product mixture. Cerium(IV) is separated on a column of siliconized kieselguhr saturated with di-(2-ethylhexyl)phosphoric acid (HDEHPA). After washing the column with a mixture of sodium bromate and nitric acid, cerium is eluted by a mixture of 5M HNO3 and 0.1M ascorbic acid. The optimum conditions for the quantitative sorption and elution of cerium were found, and the reproducibility of the yield was verified. The influence of other fission and corrosion products (Mg, Fe, Al, U) on the sorption and elution of cerium was studied. The method has been successfully applied for the determination of cerium in artificial and natural mixtures of fission products.

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Abstract  

Third part of the international comparative experiment SROK, the determination of the concentration of Pu in spent fuel of the WWER-70, type, using the isotope dilution method with an alpha-spectrometric end, is discussed.

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