[en] This work deals with the effect of ionizing radiations on polymers. On particular are described: - the different types of ionizing radiations used, the chemical effects induced and the industrial equipments used to produce ionizing radiations; - the reticulation of polymers by ionizing radiations (which type of polymers are concerned, the alterations of their properties: chemical stability - mechanical resistance - heat resistance, the application sectors); - the grafting of polymers by ionizing radiations (principle of radio-grafting, factors influencing the radio-grafting, advantages, industrial implementation and applications). (O.M.)