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  • Electronic Resource  (15)
  • 1985-1989  (15)
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  • Electronic Resource  (15)
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  • 11
    Electronic Resource
    Electronic Resource
    99mTc-1,7-bis (2-pyridyl)-2,6-diazaheptane (DPTN) complexes: Production yield and stability in slightly basic media (1985)
    Springer
    Journal of radioanalytical and nuclear chemistry 92 (1985), S. 237-246 
    Details
    ISSN: 1588-2780
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract The reduction of99mTc by SnCl2 in the presence of 1,7-bis (2-pyridyl)-2,6-diazaheptane (DPTN) has been investigated in borate buffer solutions with pHs ranging from 6.7 to 9.5. The resulting cationic, neutral and anionic complexes, in addition to TcO2 and TcO 4 − impurities, were separated by high voltage paper electrophoresis. The cationic complex turned into neutral and then into an anionic form via hydrolysis. These three species were also separated by gel filtration on a Bio-Gel P-2 column; their formation yields, stability, and the rate of their hydrolysis are presented as a function of the pH, and the results are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02219753
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    Paper (German National Licenses)
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  • 12
    Electronic Resource
    Electronic Resource
    Studies in heavy ion activation analysis (1985)
    Springer
    Journal of radioanalytical and nuclear chemistry 88 (1985), S. 369-377 
    Details
    ISSN: 1588-2780
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract 7Li induced radioactivation was used for the trace determination of hydrogen via the1H(7Li, n)7 Be reaction. At 21 MeV7Li, only boron and magnesium present small nuclear interferences. An activation curve has been established by bombarding a stack of thin mylar foils. The comparison of this curve with the excitation function for the forward reaction, namely7Li(p, n)7 Be, shows that the recoil range from the superficial hydrogen atoms is only 1.7 mg·cm−2, allowing post-irradiation etching. Hydrogen has been determined in titanium and lead bronze at the 100 ppm level with a relative precision of 6 to 10%. Studies of 32 potential interfering elements suggest the extension of Li activation to the trace determination of Na[23Na(7Li,6Li)24Na] and K[39K(7Li, d)44m,44Sc].
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02037013
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  • 13
    Electronic Resource
    Electronic Resource
    Studies in heavy ion activation analysis (1985)
    Springer
    Journal of radioanalytical and nuclear chemistry 90 (1985), S. 341-348 
    Details
    ISSN: 1588-2780
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract 10B induced radioactivation was used for the trace determination of hydrogen via the1H(10B α)7Be reaction. At 27 MeV10B++, only boron and magnesium present small nuclear interferences. An activation curve has been established by bombarding stacks of thin mylar foils. The comparison of this curve with the excitation function for the forward reaction, namely10B(p, α)7Be, shows that the recoil range from superficial hydrogen atoms is small. Hydrogen has been determined in titanium and lead bronze at the 100 ppm level. Studies of 21 potential interfering elements suggest that10B activation might be suitable for the trace determination of lithium [6Li(10b,n)15O and7Li(10B, 2n)15O] and oxygen [18O(10B,α)24Na].
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02060790
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  • 14
    Electronic Resource
    Electronic Resource
    Kinetic study of the aquation of K2 TcBr6 in perchlorate solutions (1985)
    Springer
    Journal of radioanalytical and nuclear chemistry 92 (1985), S. 283-292 
    Details
    ISSN: 1588-2780
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract The aquation of TcBr 6 2− in perchlorate solutions at various hydrogen ion concentrations and ionic strengths has been investigated. Although the same products form in all cases the proportions of the cationic and neutral products depend on the [H+] and the ionic strength. Differences in LiClO4/HClO4 and NaClO4/HClO4 can be attributed to differences in the activities, although at constant ionic strength. A rate constant of 1.75·10−5 s−1 was found for the aquation at μ=1, together with an activation energy of 101.6±12.5 kJ/mol.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02219758
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    Paper (German National Licenses)
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  • 15
    Electronic Resource
    Electronic Resource
    Studies in heavy ion activation analysis (1985)
    Springer
    Journal of radioanalytical and nuclear chemistry 90 (1985), S. 349-354 
    Details
    ISSN: 1588-2780
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract Both7Li and10B induced radioactivation were applied to trace determination of hydrogen via the1H(7Li,n)7Be and1H(10B, α)7Be reactions. In both cases, boron and magnesium present nuclear interferences, but their extent does not exceed 0.5%. At the bombarding energies used, 21 MeV7Li++ and 27 MeV10B++ the detection limits are respectively 2 and 0.5 ppm for an iron matrix irradiated for two hours. Due to the recoil of7Be, the samples were carefully prepared to avoid superficial hydrogen contamination. A series of samples which hydrogen content ranges from 15 to 120 ppm was examined, and the results obtained with the two beams were compared.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02060791
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    Paper (German National Licenses)
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