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  • Springer  (2)
  • 1
    Electronic Resource
    Electronic Resource
    Application of a pulsed slow-positron beam to polymers (1999)
    Springer
    Journal of radioanalytical and nuclear chemistry 239 (1999), S. 329-333 
    Details
    ISSN: 1588-2780
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract Pulsed slow positrons were produced using a time-varying moderator bias with an interval of 82 ns; 97% of the positrons were compressed within 2 ns width at the target position. Both the positron annihilation lifetime and Doppler broadening of the positron annihilation radiation (DBPR) of polytetrafluoroethylene (PTFE) were measured as a function of the incident energy of slow positrons. It was shown that the lifetime and intensity of the long-lived component of positron annihilation are independent of the positron incident energy above 1.2 keV. However, the width of the Doppler-broadened annihilation γ-ray increased in the energy region below 1.2 keV.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02349506
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Free volume of cyanate resins studied by positron annihilation (1996)
    Springer
    Journal of radioanalytical and nuclear chemistry 210 (1996), S. 555-562 
    Details
    ISSN: 1588-2780
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract The polymerization process of bisphenol-A dicyanate (BADCy) has been studied using a positron-annihilation lifetime technique (PAL). The polymerization was conducted at 150°C, and the process was followed by PAL. Seven kinds of samples with different curing times were also formed at 150°C, and the relation between the period of the curing time and the degree of polymerization was studied. It has been shown that theo-Ps lifetime increases in samples with a higher polymerization than 85%, which is consistent with measurements of the specific volume of BADCy.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02056395
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    Paper (German National Licenses)
    Fulltext
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