| 摘要 |
<p>A charged particle accelerator (100) has a switching device (166) for switching on and off the extraction of a charged particle beam, an irradiation unit (110) has electromagnets (220, 221) for setting an irradiation point of the charged particle beam to be irradiated on an irradiation target, and a control unit (130) controls the switching device to cause it to switch on and off the beam extraction and the electromagnets (220, 221) to cause them to change the irradiation point. When the switching device (166) switches on the extraction of the charged particle beam circulating through the charged particle accelerator (100) into the irradiation unit (100), the charged particle beam is irradiated on the irradiation target in the irradiation unit. When the switching device switches off the beam extraction from the charged particle accelerator into the irradiation unit, the irradiation of the charged particle beam on the irradiation target is also stopped. Accordingly, when the control unit (130) controls the switching device to cause it to switch on and off the beam extraction, the irradiation on the irradiation target can also be switched on and off. Since the electromagnets (220, 221) set the irradiation point of the charged particle beam in the irradiation unit (110), the charged particle beam extracted from the charged particle accelerator into the irradiation unit can be irradiated on the irradiation target. Since the control unit (130) controls the electromagnets (220, 221) to cause them to change the irradiation point, the charged particle beam can be irradiated on another irradiation point of the irradiation target. Even when the irradiation target has a complicated shape, the irradiation target can be irradiated with high accuracy through simplified control. The irradiation is continued until a target of irradiation dose is reached and therefore, even when the beam intensity changes temporally, the irradiation target can be irradiated with uniform beam density. <IMAGE></p> |
