Ion beam delivery equipment and an ion beam delivery method

An ion beam delivery method for emitting a ion beam extracted from a beam generator through an beam delivery nozzle, which includes a beam energy adjustment device having a thickness varied in the direction of travel of said ion beam to change energy of said ion beam passing said beam energy adjustment device, thereby forming a spread-out Bragg peak width in an irradiation target, the method comprising the steps of:

• detecting a first ionization charge of said ion beam upstream of said beam energy adjustment device and detecting a second ionization charge of said ion beam downstream of said beam energy adjustment device in the direction of travel of said ion beam;
• and
• computing the spread-out Bragg peak width based on the first ionization charge and the second ionization charge.

An ion beam delivery method for emitting a ion beam extracted from a beam generator through an beam delivery nozzle, which includes a beam energy adjustment device having a thickness varied in the direction of travel of said ion beam to change energy of said ion beam passing said beam energy adjustment device, thereby forming a spread-out Bragg peak width in an irradiation target, the method comprising the steps of:

• detecting a first ionization charge of said ion beam upstream of said beam energy adjustment device and detecting a second ionization charge of said ion beam downstream of said beam energy adjustment device in the direction of travel of said ion beam;
• and
• computing the spread-out Bragg peak width based on the first ionization charge and the second ionization charge, and determining whether the computed spread-out Bragg peak width is equal to a setting width.