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AuthorAl-Qaradawi, I. Y.
AuthorBritton, D. T.
AuthorAbdel-Hady, E. E.
AuthorAbdulmalik, D. A.
AuthorAl-Shobaki, M. A.
AuthorMinani, E.
Available date2023-11-19T08:15:08Z
Publication Date2003-01-01
Publication NameRadiation Physics and Chemistry
Identifierhttp://dx.doi.org/10.1016/S0969-806X(03)00205-6
CitationAl-Qaradawi, I. Y., Britton, D. T., Abdel-Hady, E. E., Abdulmalik, D. A., Al-Shobaki, M. A., & Minani, E. (2003). Positron annihilation studies of the effect of gamma irradiation dose in polymers. Radiation Physics and Chemistry, 68(3-4), 457-461.‏
ISSN0969806X
URIhttps://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=0141739270&origin=inward
URIhttp://hdl.handle.net/10576/49478
AbstractPositron annihilation lifetime (PAL) technique has been applied to study the effect of gamma irradiation dose on the structure of low-density polyethylene and polystyrene. The positron annihilation lifetime measurements were performed with a conventional fast-fast coincidence system. Gamma irradiation was carried out at room temperature with a 60Co gamma source up to a dose of 1000kGy. The delayed lifetime spectra of irradiated and unirradiated samples were decomposed into three lifetime components. The lifetime parameters give indication of the free-volume size and concentration. It was found that the crosslinking efficiency in the polymer increases significantly with increasing irradiation dose. This appears as a decrease in the intensity of the long-lived positron lifetime components attributed to ortho-positronium formation. Measurements of the Doppler broadening energy spectra of the low-density polyethylene (LDPE) samples have also been performed using a variable mono-energetic positron beam. The trend of the Doppler broadening lineshape S-parameter as a function of the radiation dose supports the lifetime results. © 2003 Elsevier Ltd. All rights reserved.
Languageen
PublisherElsevier Ltd
SubjectCross-linking
Gamma irradiation
Polyethylene
Polymers
Polystyrene
TitlePositron annihilation studies of the effect of gamma irradiation dose in polymers
TypeConference Paper
Pagination457-461
Issue Number3-4
Volume Number68
dc.accessType Abstract Only


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