Positron annihilation studies of the effect of gamma irradiation dose in polymers
المؤلف | Al-Qaradawi, I. Y. |
المؤلف | Britton, D. T. |
المؤلف | Abdel-Hady, E. E. |
المؤلف | Abdulmalik, D. A. |
المؤلف | Al-Shobaki, M. A. |
المؤلف | Minani, E. |
تاريخ الإتاحة | 2023-11-19T08:15:08Z |
تاريخ النشر | 2003-01-01 |
اسم المنشور | Radiation Physics and Chemistry |
المعرّف | http://dx.doi.org/10.1016/S0969-806X(03)00205-6 |
الاقتباس | Al-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. |
الرقم المعياري الدولي للكتاب | 0969806X |
الملخص | 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. |
اللغة | en |
الناشر | Elsevier Ltd |
الموضوع | Cross-linking Gamma irradiation Polyethylene Polymers Polystyrene |
النوع | Conference Paper |
الصفحات | 457-461 |
رقم العدد | 3-4 |
رقم المجلد | 68 |
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