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Radiation effect on positronium formation in low-temperature polyethylene |
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| Authors: | T. Suzuki Y. Ito K. Kondo E. Hamada Y. Ito |
| Affiliation: | a Radiation Science Center, High Energy Accelerator Research Organization (KEK), Oho, Tsukuba 305-0801, Japan b Department of Accelerator Science, The Graduate University for Advanced Studies, Radiation Science Center, High Energy Accelerator Research Organization (KEK), Oho, Tsukuba 305-0801, Japan c Research Center for Nuclear Science and Technology, The University of Tokyo, Tokai-mura, Ibaraki 319-1106, Japan |
| Abstract: | The irradiation effect of γ-rays on polyethylene (PE) has been studied by positron annihilation lifetime spectroscopy (PALS). In the case of non-irradiated PE samples, at a low temperature below the glass-transition temperature, the intensity of the long-lived component of positronium, I3, increases due to an increase in the concentration of trapped electrons. However, the increase in I3 obtained in a few MGy γ-irradiated samples became very small due to the effect of induced radicals. It has been observed that the trapped electrons were affected by the intensity of the positron sources used for a PALS experiment. |
| Keywords: | Radiation effect Positronium Low temperature Polyethylene |
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