< Topic > Occurrence of the moire stripe is controlled, furthermore the hollow grid whose absorption of the transmitted x-ray is little is produced, easily. Solutions As for the hollow grid of this invention, as for the intermediate substance which transmits the x-ray it does not exist, in order for the x-ray cover material to become interval of integer two times the pixel pitch of two dimensional radiation detector, being something which strictly it is arranged is constituted, the x-ray cover material has the structure which is kept by gluing with the cladding material of the top and bottom. Because of that it is possible to achieve the structure which moire is difficult to occur by administering sensitivity revision.In addition because it assembles making use of the assembly jig, it is possible precision to produce the interval of the x-ray cover material well simply, quality variation as a finished product is little, it becomes something whose precision is high as a product.< Selective figure > Figure 1【課題】 モアレ縞の発生を抑制し、しかも透過X線の吸収が少ない中空グリッドを、容易に製作する。【解決手段】 本発明の中空グリッドは、X線を透過する中間物質は存在せず、X線遮蔽材が二次元放射線検出器の画素ピッチの整数倍の間隔となるように厳密に配置構成されたものであって、X線遮蔽材は上下の被覆材との接着により保持される構造をもつ。そのため感度補正を施すことによりモアレが発生しにくい構造を達成することができる。また組立治具を用いて組み立てているので、X線遮蔽材の間隔を精度良く簡易に作製することができ、完成品としての品質ばらつきが少なく、製品として精度の高いものになる。【選択図】 図1
