| Issue |
J. Phys. IV France
Volume 03, Number C4, Septembre 1993
4th International Workshop on Positron and Positronium Chemistry
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|---|---|---|
| Page(s) | C4-279 - C4-281 | |
| DOI | https://doi.org/10.1051/jp4:1993444 | |
J. Phys. IV France 03 (1993) C4-279-C4-281
DOI: 10.1051/jp4:1993444
Positron lifetime measurements in polyethylene under different conditions
G. BRAUER1, Th. DANIEL2, W. FAUST3, Z. MICHNO4 and H. SCHNEIDER31 Research Centre Rossendorf Inc., WIP Project, P.O. Box 510119, 01314 Dresden, Germany
2 Phys. Chem. Institut
3 Strahlenzentrum, Univ. Giessen, 35392 Giessen, Germany
4 Technical University Opole, Poland
Abstract
Positron lifetime measurements were performed on polyethylene probes of different densities under various atmospheric conditions within a [MATH]-dose range from 0 kGy up to 1460 kGy. We present here experiments non destroying the sample. Four components could be resolved in each lifetime spectrum ; the components consist each of a lifetime [MATH] and an intensity I. In the dose range investigated the behaviour of the lifetime parameters of the longest lived ([MATH]) and the second long-lived ([MATH]) component, respectively, could be explained by the [MATH] recristallisation and the creation of hydroperoxides. The average free volume as a function of the dose may be calculated out of the lifetime of the fourth component ([MATH]).
© EDP Sciences 1993