An irradiation apparatus has a large irradiation field and is capable of ensuring the uniformity of a dose distribution without strengthening the performance of an irradiation field enlarging device. The irradiation apparatus includes a beam interruption part for performing a plurality of irradiations...http://www.google.ca/patents/US6984835?utm_source=gb-gplus-sharePatent US6984835 - Irradiation apparatus and irradiation method
