Radiation irradiation device, radiation irradiation method and program storage medium

摘要

A radiation irradiation device is provided that includes: a metal target that emits bremsstrahlung X-rays as a radiation beam due to irradiation with an electron beam; a radiation shielding member that includes a slit-shaped radiation passage portion and that is disposed downstream of the metal target in the radiation beam emission direction and is disposed such that a portion of the radiation beam passes through the radiation passage portion and the radiation beam incident to regions other than the radiation passage portion is blocked; and an electron beam generating device that irradiates, onto the metal target, an electron beam such that a diameter at a generation point of the emitted radiation beam is smaller than a length of an entry portion of the radiation passage portion along a length direction of the entry portion.

主权项

1. A radiation irradiation device, comprising:
a metal target that emits bremsstrahlung X-rays as a radiation beam due to irradiation with an electron beam, the radiation beam emitted from the metal target spreading out in a cone shape; a radiation shielding member that includes a plurality of slit-shaped radiation passage portions and that is disposed downstream of the metal target in the radiation beam emission direction and is disposed such that a portion of the radiation beam passes through the radiation passage portions and the radiation beam incident to regions other than the radiation passage portions is blocked; an electron beam generating device that irradiates, onto the metal target, an electron beam such that a diameter at a generation point of the emitted radiation beam is smaller than a length of an entry portion of the radiation passage portion along a length direction of the entry portion; and a control unit that effects control of moving at least one of a first region or a second region, the first region being an irradiation target of the radiation beam and the second region being an irradiation region of the radiation beam that has passed through the radiation shielding member, the moving being performed by relatively moving the second region with respect to the first region such that the radiation beam that has passed through the radiation passage portions partially overlaps before and after the moving, wherein the plurality of radiation passage portions are disposed at different positions such that the generation point of the radiation beam is positioned at an intersection point of slit planes of the radiation passage portions.