| 摘要 |
<p>A tracking type radiation shielding apparatus comprising a shielding block (14) having transmitted radiation for determining a radiation field, a pedestal (50) for placing the shielding block thereon, and a slide means for allowing the pedestal to slide in the moving direction of an irradiation part of the radiation. The slide means comprises an arc-shaped guide part (63) in which a moving locus of the shielding block depicts an arc, and a drive unit (53) for providing a moving force to the pedestal based on the external control signal. Since the shielding block is moved in an arc shape, the radiation passing through block pores is hardly subjected to irregular reflection, the radiation field is prevented from scattering at the irradiation part of the radiation, and the radiation field is not expanded excessively. The irradiation field is allowed to follow the irradiation part without expanding the radiation field.</p> |
