Depth-dependent positronium formation in γ-irradiated polymers after 30-month aging

Depth-dependent positronium (Ps) formation and annihilation study of Co-60 γ-irradiated polyethylene and polytetrafluorethylene were performed. After 30-month aging, no free radicals effect on Ps formation was detected for the studied polymers. Efficient trapping of back-diffusion positrons was obse...

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Bibliographic Details
Published in:Applied surface science 2008-10, Vol.255 (1), p.205-208
Main Authors: Yu, R.S., Hao, X.P., Ma, Y.Y., Wang, P., Qin, X.B., Zhang, Z., Wang, B.Y., Wei, L., Suzuki, T., Ito, Y., Shantarovich, V.P.
Format: Article
Language:English
Subjects:
Irradiation
Polymer
Positron annihilation
Positronium
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Summary:Depth-dependent positronium (Ps) formation and annihilation study of Co-60 γ-irradiated polyethylene and polytetrafluorethylene were performed. After 30-month aging, no free radicals effect on Ps formation was detected for the studied polymers. Efficient trapping of back-diffusion positrons was observed in heavily irradiated samples, where Ps formation probability near polymer surface and in the bulk turns to be equivalent to each other. Results shown that positron annihilation Doppler broadening in polytetrafluorethylene is prevailingly influenced by high momentum electrons of fluorine atoms instead of Ps intensity.
ISSN:0169-4332
1873-5584
DOI:10.1016/j.apsusc.2008.05.206