Provided are a system and method for irradiating charged particles in which a subject to be irradiated is irradiated efficiently even when irregular fluctuations occur during gated irradiation, enabling the irradiation time and treatment time to be reduced. Beam emission is stopped by regular receipt of an emission permission termination signal caused by a regular movement signal. However, an emission-enabled-state-maintaining function (46b) is activated upon receipt of an emission-permission-termination signal. When a predetermined standby time has elapsed without an emission permission start signal again being received during standby, the action of the emission-enabled-state-maintaining function (46b) is terminated. A charged particle beam generator (1) decelerates the beam. In some cases, beam emission is also stopped by irregular receipt of the emission permission termination signal during irradiation. However, the emission-enabled-state-maintaining function (46b) is activated upon receipt of an emission-permission-terminating signal, and the charged particle beam generation device (1) maintains an emission-enabled state. When the emission- permission-starting signal is again received during standby, beam emission is restarted.Linvention fournit un système et un procédé dirradiation de particules chargées permettant de réduire la durée dirradiation et la durée de traitement, en effectuant une irradiation dune efficacité satisfaisante même en cas de survenance de variations irrégulières de lobjet à irradier. Lémission dun faisceau est stoppée par réception dun signal darrêt dautorisation démission régulier à laide dun signal de déplacement régulier. Une fonction de maintien détat démission possible (46b) est activée par cette réception de signal darrêt dautorisation démission. Lorsquune durée dattente établie est passée sans nouvelle réception dun signal de commencement dautorisation démission pendant lattente, la fonction de maintien détat démission possible (46
