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  • 1
    Electronic Resource
    Electronic Resource
    Effect of cascade coincidences on the efficiency calibration of a gamma-X detector (1993)
    Springer
    Journal of radioanalytical and nuclear chemistry 169 (1993), S. 419-427 
    Details
    ISSN: 1588-2780
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract The sensitivity on n-type gamma-X detectors for low-energy X- and γ-rays calls for coincidence corrections in the efficiency calibration that do not apply to the calibration of p-type detectors. Corrections were calculated for the effect of cascade coincidences between γ-rays, X-rays, annihilation radiation, and bremsstrahlung, for 15 radionuclides frequently used for efficiency calibration. Experimental results are presented for a γ-X detector with 37% relative efficiency at distances from 0.9 to 17.5 cm. After coincidence correction smooth efficiency curves were found for the energy range 12 to 2750 keV, even for the position closest to the detector.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02042998
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    Paper (German National Licenses)
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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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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    A pre-irradiation separation procedure based on ion-exchange chromatography for gallium determination in biological and environmental materials by neutron activation analysis (1992)
    Springer
    Journal of radioanalytical and nuclear chemistry 157 (1992), S. 265-272 
    Details
    ISSN: 1588-2780
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract A pre-irradiation separation procedure, for gallium determination in biological and environmental materials by neutron activation analysis (NAA) is reported. The proposed method, based on ion-exchange chromatography, allows to eliminate the radiation risk, while taking the advantages of high sensitivity of NAA. The single comparator method is employed for gallium quantitative evaluation. Since no standard reference materials with certified gallium contents were available, the reliability of the proposed method was extensively investigated by various approaches. Four biological and one environmental standard reference materials, with gallium contents ranging from 54 μg/g-3 ng/g, have been analyzed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02047441
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Correction for neutron induced reaction interferences in the NAA k0-standardization method (1989)
    Springer
    Journal of radioanalytical and nuclear chemistry 133 (1989), S. 153-165 
    Details
    ISSN: 1588-2780
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract A study is made of the correction, in k0-standardized NAA, for interferences caused by fast neutron induced threshold reactions, second order reactions and235U-fission. The following examples are elaborated: determination of the Cr and Sc concentrations in a reference human serum, corrected for the54Fe(n,α)51Cr and44Ca(n,γ;β−; n,γ)46Sc interferences, respectively, and the determination of Zr, Cs, La, Ce, Nd and Sm concentrations in USGS BCR-1 and G-2, corrected for235U(n, f) interference. A detailed uncertainty analysis and a comparison of the analytical results thus obtained with other literature values proves that the interferences can be accurately corrected for by employing the usual neutron flux monitors in the k0-method, namely a Zr-foil and a dilute Au−Al alloyed wire.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02039972
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    Limit of detection for the determination of Pt in biological material by RNAA using electrolytic separation of gold (1992)
    Springer
    Journal of radioanalytical and nuclear chemistry 160 (1992), S. 85-99 
    Details
    ISSN: 1588-2780
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract Neutron activation analysis based on the199Au indicator for platinum requires the separation of gold at high radiochemical purity. The limit of detection is strongly affected by the presence of gold; with a gold content of 50 pg/g, irradiating for 5 days at 5·1013 n/cm2s is needed to achieve a limit of detection of approximately 30 pg/g. In this case the nuclear interference from gold will exceed the level of platinum by several orders of magnitude and has to be determined with exceedingly high precision. Preliminary results for SRM 1577 Bovine Liver with 95% yield gave consistent results for Au, but Pt could not be detected.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02041660
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    Paper (German National Licenses)
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