JJAP Conf. Proc. 2, 011103 (2014) doi:10.7567/JJAPCP.2.011103
In situ observation of damage evolution in polycarbonate under ion irradiation with positrons
- 1Quantum Science and Engineering Center, Kyoto University, Uji, Kyoto 611-0011, Japan
- 2Department of Nuclear Engineering, Kyoto University, Kyoto 615-8530, Japan
- 3Faculty of Medicine, Yamagata University, Yamagata 990-9585, Japan
- Received July 01, 2014
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We report β+–γ coincidence positron annihilation lifetime spectroscopy of in situ observation of ion damage in polycarbonate under irradiation by MeV-energy H+ ions. Ion damage was investigated from changes in the relative intensity of the long-lived ortho-positronium pick-off annihilation lifetime component measured under irradiation and non-irradiation conditions. It was found that at fluences of less than 1015 ions·cm−2 the relative intensity of this component during irradiation was significantly reduced compared to that after irradiation. This reduction disappears at fluences higher than 1015 ions·cm−2. Results suggest that at fluences up to 1015 ions·cm−2, transient damage structures are formed under irradiation.
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