CHARGED PARTICLE BEAM IRRADIATION SYSTEM

摘要

PROBLEM TO BE SOLVED: To provide a charged particle beam irradiation system which accurately measures vertical dose distributions of particle beam relative to the particle beam advancing direction within an irradiation object, and thus improves accuracy of controlling vertical irradiation dose relative to the particle beam advancing direction at each position within the irradiation object and secures desired dose distributions.

SOLUTION: The charged particle beam irradiation system has a two-dimensional dose monitor 212 and an irradiation controlling apparatus 300. A dose counter apparatus 304a measures an added dose for each region of a monitor plane of the two-dimensional dose monitor 212 by independently cumulative doses measured for each region of the monitor plane. A comparing section 306 outputs a control signal for stopping beam irradiation when the cumulative dose measured for each region of the monitor plane reaches a target dose predetermined for each region of the monitor plane so as to stop beam irradiation to a region reaching its target dose.

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