Irradiation apparatus for effectively performing intermittent irradiation in synchronism with respiration

An irradiation apparatus for treating foci of a treated body by irradiating a charged particle beam or a radiation beam of high energy, comprising:

• a respiration synchronizing circuit for detecting a respiration state of said treated body and outputting a radiation permission signal in synchronism with a rest period of said foci which are being moved by a respiration motion;
• and
• a beam passage change control circuit for deflecting said beam from a correct passage, causing said beam to impinge upon a predetermined beam stopper portion during a period in which said radiation permission signal is not outputted from said respiration synchronizing circuit and returning said beam to the correct passage during a period in which said radiation permission signal is outputted from said respiration synchronizing circuit;
• in which said beam passage change control circuit includes a circuit for properly fluctuating an impingement place when said beam is caused to impinge upon said beam stopper portion during a period in which said radiation permission signal is not outputted from said respiration synchronizing circuit.