COLLIMATOR

摘要

The present invention relates to a beam range measuring system including a slit collimator and, more specifically, to a beam range measuring system including a slit collimator, measuring a prompt gamma ray generated when an object is irradiated with a beam for measuring the beam range, which includes the slit collimator selectively collimating a gamma ray reaching a detector, wherein the slit collimator includes: a shielding unit controlling a one dimensional image put on a gamma ray passageway and measured and being capable of shielding the beam; and a driving unit varying a shape of the shielding unit and which is configured to vary an irradiation area, an irradiation type and an irradiation position of the beam according to the deformation of the shielding unit.