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    Positron annihilation studies of the effect of gamma irradiation dose in polymers

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    Date
    2003-01-01
    Author
    Al-Qaradawi, I. Y.
    Britton, D. T.
    Abdel-Hady, E. E.
    Abdulmalik, D. A.
    Al-Shobaki, M. A.
    Minani, E.
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    Abstract
    Positron 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.
    URI
    https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=0141739270&origin=inward
    DOI/handle
    http://dx.doi.org/10.1016/S0969-806X(03)00205-6
    http://hdl.handle.net/10576/49478
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    • Mathematics, Statistics & Physics [‎786‎ items ]

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