Patent ID: 7394082

Claim:
An ion beam delivery equipment for delivering a ion beam to an irradiation target, the equipment comprising: a beam generator for generating said ion beam; a beam delivery nozzle including a beam energy adjustment device having a thickness varied in the direction of travel of said ion beam extracted from said beam generator to change energy of said ion beam passing said beam energy adjustment device, thereby forming a spread-out Bragg peak width in said irradiation target, said beam delivery nozzle delivering said ion beam having passed said beam energy adjustment device to said irradiation target; a first dose monitor installed upstream of said beam energy adjustment device in the direction of travel of said ion beam; a second dose monitor installed downstream of said beam energy adjustment device in the direction of travel of said ion beam; and a spread-out Bragg peak width computing unit for computing the spread-out Bragg peak width based on a first ionization charge detected by said first dose monitor and a second ionization charge detected by said second dose monitor.