PROBLEM TO BE SOLVED: To provide a radiation shield plate and a radiation imaging device, capable of preventing generation of a radiation that is reflected by a side wall of an opening and travels toward radiation detection means.SOLUTION: A radiation imaging device includes a shield plate 75 having an opening Ap, and radiation detection means. A side wall of the opening Ap includes four surfaces corresponding to respective sides of a quadrangle so that the opening Ap has a quadrangular shape when the shield plate 75 is viewed in a plane. And at least one surface, such as Sal, Sbl, Sbr, and Scr, of the four surfaces of the opening Ap is tilted obliquely with respect to one principal surface 75a of the shield plate 75. Consequently, the device can prevent generation of a radiation that is reflected by the side wall of the opening Ap and travels toward the radiation detection means provided on a side of the other principal surface 75b of the shield plate 75.COPYRIGHT: (C)2012,JPO&INPIT【課題】開口部の側壁で反射されて放射線検出手段に向かう放射線の発生を抑える。【解決手段】開口部Apの側壁は、遮蔽板75を平面視した場合において開口部Apが四角形状を有するように当該四角形の各辺に対応する4つの面を有している。しかも、開口部Apの側壁が有する面のうち少なくとも一つの面Sal、Sbl、Sbr、Scr等は、遮蔽板75の一方主面75aに対して斜めに傾いている。その結果、開口部Apの側壁で反射されて、遮蔽板75の他方主面75b側に設けられた放射線検出手段に向かう放射線の発生を抑えることが可能となる。【選択図】図6
