Abstract
Linear energy transfer (LET) dependence of the probability of main chain scission of polymethylmethacrylate (PMMA) was investigated. The probability was obtained from decreases in molecular weight measured by gel permeation chromatography (GPC), and LET was evaluated by TRIM code. The scission probability was almost constant for low LET radiation, but decreased for high LET ion irradiation. The mechanism was interpreted from the model of spur overlapping along an ion's path.
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