Characterisation of proton irradiated CR-39 detector using positron annihilation lifetime spectroscopy |
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| Institution: | 1. Università di Pisa, Scuola di Ingegneria, Largo Lucio Lazzarino 1, Pisa, Italy;2. Yale University, School of Medicine, New Haven CT, 06511, USA;1. Department of Physics, Panjab University, Chandigarh – 160014, India;2. Inter University Accelerator Centre, Aruna Asaf Ali Marg, New Delhi – 110067, India;1. Department of Physics & Astrophysics, University of Delhi, Delhi 110007, India;2. Inter University Accelerator Centre, Aruna Asaf Ali Marg, New Delhi 110067, India;1. Department of Physics and Astrophysics, University of Delhi, Delhi 110007, India;2. Inter University Accelerator Centre, Aruna Asaf Ali Marg, New Delhi 110067, India;3. Department of Physics, Panjab University, Chandigarh 160014, India |
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| Abstract: | The damaged produced by proton beam slowed down in CR-39 polymer results in highest degree of disorder with change of free volume proprieties. Positron annihilation lifetime spectroscopy (PALS) is nowadays well recognized as powerful tool of microstructure investigations. PALS is used in order to get more information at an atomic scale of modifications induced by irradiation of polymers particularly the variation of free volume in the irradiated region. In this paper, the mean free volume hole radii and average free volume of the micro-voids in CR-39 polymer irradiated with 200 MeV therapy proton beam at different positions in spread out Bragg Peak region (SOBP) at Ithemba proton therapy facility have been determined using PALS. © 2006 Elsevier Ltd. All rights reserved. |
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