| 摘要 |
PROBLEM TO BE SOLVED: To obtain satisfactory shielding performance, freely design and manufacture one having a size corresponding to the quantity of processing air, and reduce pressure loss, and further reduce the cost. SOLUTION: Many sheet shaped structures 32 each having an opening section 30 are laminated with the openings displaced in their positions to form a spiral ventilating flow passage 34 as a wbole with the opening sections overlapped in succession, whereby a structure having radiation shielding performance is provided. An outer appearance of the sheet shaped structure may be arbitrary, i.e., circular or polygonal. Further, it may be a structure obtained by laminating sheet shaped structures with the same configuration, or may be a combination of different configuration sheet shaped structures. The configuration of the opening section formed in the sheet shaped structure is arbitrary, and is circular preferably hydrodynamically. The circular configuration of the opening section causes an advantage that a fluid effectively flows through the whole of the opening section while preventing any dwelling part from occurring, which is not only effective hydrodynamically but also prevents radiation shielding performance from being deteriorated because of formation of any wasteful opening.
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