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  • 1980-1984  (7)
  • 1960-1964  (2)
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  • 1
    Electronic Resource
    Electronic Resource
    γ-Spectrometry compensated for the Compton Effect (1962)
    [s.l.] : Nature Publishing Group
    Nature 194 (1962), S. 859-859 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] To minimize counting losses, the detection efficiency of both detectors, in the Compton region, should be approximately the same. This requires equal diameters of the scintillators. The cost of the anthracene detector thus becomes quite high when large Nal(Tl) crystals are used. It appeared, ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/194859a0
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  • 2
    Electronic Resource
    Electronic Resource
    Computer-assisted reactor NAA of geological and other reference materials, using the k0-standardization method: Evaluation of the accuracy (1984)
    Springer
    Journal of radioanalytical and nuclear chemistry 81 (1984), S. 333-343 
    Details
    ISSN: 1588-2780
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract USGS BCR-1 and G-2, NBS 1633a Coal Fly-Ash and a 7-element synthetic standard for biological material have been analysed in this work by reactor NAA, using the k0-standardization method. The analyses were performed independently in the analytical laboratories of the Institute for Nuclear Sciences (INW), Gent, and the Central Research Institute for Physics (KFKI), Budapest. This procedure allowed not only a comparison with the specified data or with other published values, but enabled a check of the consistency of our own results obtained in largely different experimental circumstances. As concluded the k0-standardization method combines general versatility (with respect to irradiation and counting conditions) with good accuracy, while keeping the experimental work as simple as possible. Since the k0 method is a computer-oriented technique, a FORTRAN IV program was designed and applied on a VAX 11/780 machine.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02135386
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  • 3
    Electronic Resource
    Electronic Resource
    Critical evaluation and experimental determination of the nuclear activation and decay parameters for the reactions:50Cr(n, ψ)51Cr,58Fe(n, ψ)59Fe,109Ag(n, ψ)110mAg (1984)
    Springer
    Journal of radioanalytical and nuclear chemistry 81 (1984), S. 369-396 
    Details
    ISSN: 1588-2780
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract Isotopic abundance values for50Cr,58Fe and109Ag and the absolute gamma-intensities for51Cr,59Fe and110mAg were evaluated. These evaluated data, together with experimental k0-determinations (i.e. from the “activation method”), made it possible to calculate the following 2200 m.s−1 cross-sections, which considerably deviate from the hitherto generally published ones [between brackets]: $$\begin{gathered} {}^{5 0}Cr(n,\gamma )^{5 1} Cr; \sigma _0 = (15.2 \pm 0.2) barn [cf.:15.8 - 16.0] \hfill \\ {}^{5 8}Fe(n,\gamma )^{5 9} Fe; \sigma _0 = (1.31 \pm 0.03) barn [cf.:1.14 - 1.16] \hfill \\ {}^{1 0 9}Ag(n,\gamma )^{1 1 0 m} Ag;\sigma _0 = (3.89 \pm 0.05) barn [cf.:4.4 - 5.0] \hfill \\ \end{gathered} $$
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02135390
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  • 4
    Electronic Resource
    Electronic Resource
    A method for experimental determination of effective resonance energies related to (n, γ) reactions (1984)
    Springer
    Journal of radioanalytical and nuclear chemistry 82 (1984), S. 169-179 
    Details
    ISSN: 1588-2780
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract When making use of some single comparator or absolute standardization methods in reactor neutron and in epicadmium neutron activation analysis, the knowledge of the effective resonance energy ( $$\bar E_r $$ ) is essential to correct for the effect of the nonideal epithermal flux distribution on the analysis result. $$\bar E_r $$ can be calculated from neutron resonance data, but when these are incomplete, not accurate or even not known at all, experimental determination should be considered. Such a method, providing both $$\bar E_r $$ and the resonance integral to 2200 ms−1 cross-section ratio (QO), is described in this paper. Results are given for 11 isotopes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02227339
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  • 5
    Electronic Resource
    Electronic Resource
    k0-measurements and related nuclear data compilation for (n, γ) reactor neutron activation analysis (1984)
    Springer
    Journal of radioanalytical and nuclear chemistry 82 (1984), S. 385-452 
    Details
    ISSN: 1588-2780
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract Recommended k0-factors and related nuclear data for use in (n, γ) activation analysis are given for 72 isotopes. In addition the basic nuclear constants and experimental parameters needed in the k0 standardization method are reviewed. For convenient data reduction, computer programs were developed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02037061
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  • 6
    Electronic Resource
    Electronic Resource
    Some elucidations to the concept of the effective resonance energy $$\bar E_r $$ (1984)
    Springer
    Journal of radioanalytical and nuclear chemistry 82 (1984), S. 379-383 
    Details
    ISSN: 1588-2780
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract The concept of the effective resonance energy $$\bar E_r $$ , formerly introduced as a parameter in the absolute (e.g. k0-) standardization methodology of (n, γ) activation analysis, is elucidated with respect to dimensioning, accuracy and usefulness.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02037060
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  • 7
    Electronic Resource
    Electronic Resource
    Comparative study of measured and critically evaluated resonance integral to thermal cross-section ratios. Part II (1984)
    Springer
    Journal of radioanalytical and nuclear chemistry 81 (1984), S. 397-415 
    Details
    ISSN: 1588-2780
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract The present paper deals with the experimental determination and the critical evaluation of Qo, the ratio of the resonance integral (Io) to the 2200 m.s−1 cross-section (σo) for 57 analytically interesting (n, γ) reactions, including a revision and updating of formerly published results for 13 isotopes. Full account is given for deviations from the ideal epithermal neutron flux distribution. The Budapest-Gent cooperative determinations, yielding parallel but independent results, lead to recommended Qo-values with an average uncertainty as low as ∼3%. Finally, with the aid of independently evaluated or measured σo-data, a list of recommended Io-values is given.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02135391
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  • 8
    Electronic Resource
    Electronic Resource
    Radiometric control of analytical separation procedures (1962)
    Springer
    Microchimica acta 50 (1962), S. 76-86 
    Details
    ISSN: 1436-5073
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Verschiedene analytische Trennungsverfahren wurden mit Hilfe radiometrischer Indikatormethoden überprüft. Durch Flüssig-flüssig-Extraktion mit Isoamylacetat lassen sich Chromspuren aus großen Eisenüberschüssen entfernen. Das so gereinigte Eisen wurde durch Bestrahlung mit thermischen Neutronen auf Chromreste geprüft. Ein analoges Extraktionsverfahren mit isoamylalkoholischer Cuproinlösung wurde zur Abtrennung von Kupferspuren aus bestrahltem Zink verwendet. Weiters wurden die quantitative Extraktion von Zink mit Methyldioctylamin in Xylol und die Vollständigkeit der Fällung von Zink-Thiocyanatomercuriat überprüft. Die Trennung von Nickel und Kobalt mittels Dimethylglyoxim wurde mit Spuren65Ni und60Co untersucht. Ungefähr 0,6% Kobalt wurden mitgefällt. Die mit Kaliumdipikrylaminat und Kaliumtetraphenylborat mitgefällte Natriummenge beträgt etwa 0,5%. Da diese Reinigung zur selektiven Messung derβ-Aktivität des42K in Gegenwart von24Na ausreicht, wurde keine weitere Reinigung durch wiederholte Fällung versucht.
    Abstract: Résumé Plusieurs méthodes de séparations analytiques furent contrôlées à l'aide de traceurs radioactifs. Il s'avéra possible d'éliminer des traces de chrome d'un excès de fer en employant une technique d'extraction liquide-liquide à base d'acétate d'isoamyle. Le degré de purification du fer fut contrôlé par irradiation dans un flux de neutrons thermiques. Le 2-2′ dichinolyle fut employé pour l'extraction sélective de traces de cuivre d'un échantillon de zinc irradié. Il fut ensuite prouvé que le zinc peut être isolé quantitativement par extraction au méthyle-dioctylamine ou en le précipitant sous la forme de Zn[Hg(SCN)4]. La séparation nickel-kobalt à l'aide du diméthyleglyoxime fut contrôlée à l'aide de65Ni et de60Co. Environ 0,5% du cobalt présent fut coprécipité dans les conditions expérimentales données. Enfin, la coprécipitation du sodium avec le dipicrylaminate ou le tetraphénylborate de potasse fut déterminée; en moyenne elle fut de l'ordre de 0,5%.
    Notes: Summary Different analytical separation procedures were investigated by radioactive tracer techniques. By liquid-liquid extraction with isoamylacetate it was found possible to eliminate traces of chromium from a great excess of iron. The iron thus purified was tested for residual Cr by thermal neutron irradiation. A corresponding extraction technique, using cuproïne in isoamylalcohol as extractant, was used for the separation of traces of copper from irradiated zinc. The quantitative extraction of zinc with methyldioctylamine in xylol and the quantitative character of the Zn[Hg(SCN)4] precipitation were furthermore proved. The separation of nickel and cobalt by dimethylglyoxime precipitation was investigated with65Ni and60Co tracers. About 0.6% cobalt was coprecipitated. Coprecipitation of sodium with potassium dipicrylaminate and with potassium tetraphenylborate was found to be about 0.5%. As this decontamination was sufficient to permit selectiveβ-counting of42K in presence of24Na, no double precipitation purification step was attempted.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01220325
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  • 9
    Electronic Resource
    Electronic Resource
    Multielement thin film standards for XRF analysis (1980)
    New York, NY [u.a.] : Wiley-Blackwell
    X-Ray Spectrometry 9 (1980), S. 206-211 
    Details
    ISSN: 0049-8246
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Physics
    Notes: Multielement thin film standards are made by mixing a solution of different elements and a radioactive tracer (24Na) with the water soluble polymer mehtylcellulose. A film is produced by spreading the liquid mixture evenly on glass plates and letting it dry. Standards of the desired size and shape are punched out. The concentrations of the elements are calculated from the tracer activity. Ten sets of standards containing the elements Na, Mg, Al, Si, P, S, Cl, K, Cs, Ti, V, Cr, Mn, Fe, Co, Ni, Cu, Zn, As, Se, Br, Rb, Sr, Ag, Cd, Sn, Sb, Ba and Pb in different groupings have been prepared. Homogeneity and accuracy oof the standards are extensively discussed. The accuracy is also estimated by the alalysis of the standards using several techniques. The precision of the analysis factors derived from the standards is better than 1-2%, while the accuracy for the elements Al, Cl, Ca, Ti, V, Cr, Mn, Fe, Co, Ni, Cu, Zn, Se, Br, Sb, Ba and Pb is found to be better than 5%.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/xrs.1300090412
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