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Report No.
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Change in gel fraction of polyethylene after irradiation; Evaluation by positron annihilation lifetime spectroscopy

Kitada, Naoya*; Oka, Toshitaka   ; Okutsu, Kenichi*; Yamashita, Takuma*; Kino, Yasushi*; Sekine, Tsutomu*

Polyethylene (PE) is widely used for insulators in nuclear power plants and accelerators. During long-term usage, since PE is subjected to radiation environments, and is degraded by oxidation. To evaluate the degradation of PE, destructive measurement such as gel fraction measurement and tensite test, are usually utilized. In this work, we attempted to evaluate the degradation undestructively by using positron annihilation lifetime spectroscopy. We found out the relationship between the ratio of the positrons annihilation in the free volume hole and the gel fraction (corresponds with the cross-linking of the polymer matrix).

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