The G values of poly(methyl methacrylates) (PMMA), polycarbonates, and a polylactone for γ‐radiation were determined by using a computer‐assisted GPC as the primary tool for the measurement of the number‐average molecular weights M̄n. The accuracy and precision of the automated GPC were found to have a normalized standard deviation (σ/M̄n) of less than 7%. The G value of PMMA was determined to be essentially independent of molecular weight. For low molecular weight polymers, some nonlinearity in the I/M̄n versus dosage plot was observed at low dosage, i.e., about 1 Mrad.
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Ouano et al. (1976) studied this question.
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