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Poly(l-lactic acid) (PLA), was irradiated with γ-rays in air and in vacuum at 25°C. Melting point T m , glass transition temperature T g and number-average molecular weight Mn decreased with increasing irradiation dose. At low doses, T m , T g and Mn decreased sharply and then the rate became slower. Up to 200 kGy, PLA was predominantly degraded by random chain-scission...