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[en] The sorption rate of dimethylformamide (DMF) onto thin polyethylene terephthalate (PETP) films is reduced after they have been irradiated by 1 MeV12954Xe ions or by 60Co γ rays. It is suggested that defects in the PETP matrix structure interact with DMF molecules and lower their diffusion rate. When the heavy ions impact the polymer, they generate shock waves, which interact with the polymer and create defects at a higher rate [per unit of radiative energy] for ion irradiation than for γ irradiation
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