| 摘要 |
<p>A particle beam therapy system that is capable of irradiating a target area with an irradiation beam suitable for a particle beam therapy using a spot scanning method and that can be constructed in a small size, with low cost and of being easily adjusted, includes a synchrotron, a beam transport system and an irradiation device. The beam transport system is provided with a beam interrupting device adapted to block supply of a charged particle beam to the irradiation device. The beam interrupting device has a beam shielding magnet, an exciting power supply for the beam shielding magnet and a beam dump. The beam transport system has a bending magnet. The beam shielding magnet is provided on an inlet side of the bending magnet. The beam dump is provided on an outlet side of the bending magnet. A controller controls the exciting power supply to control the timing of an operation of the beam shielding magnet.
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