A method for decontaminating caps (2) or necks of containers by electron bombardment, the method including: an operation of the passage or positioning of the caps (2) or necks of containers in front of an electron bombardment window (8), the opening of the caps (2) or necks of the containers facing the window (8)； and an operation of electron bombardment of the caps (2) or necks of the containers, during the passage or positioning of the caps or necks of the containers in front of the window (8)； the bombardment being carried out by way of a pulsed electric field including a series of electrical pulses of determined frequency, duration and intensity.
