PROBLEM TO BE SOLVED: To provide a two-dimensional source grating that comprises a plurality of source gratings and in which the number of eclipses caused in the case of divergent X-ray radiation becomes smaller than ever.SOLUTION: A source grating 4 includes a first partial source grating 104 in which transmission parts 124 for transmitting X-rays and shielding parts 114 for intercepting the X-rays are arrayed in a first direction, and a second partial source grating 204 in which transmission parts 224 and shielding parts 214 are arrayed in a second direction crossing the first direction. The first partial source grating has a shape curved in the first direction, and the second partial source grating has a shape curved in the second direction.【課題】複数の線源格子を用いて構成される２次元の線源格子であって、発散Ｘ線が照射された場合に生じるケラレが従来よりも少ない線源格子を提供する。【解決手段】線源格子４は、Ｘ線を透過する透過部１２４と、Ｘ線を遮蔽する遮蔽部１１４と、が第１の方向に配列した第１の部分線源格子１０４と、透過部２２４と、遮蔽部２１４と、が第１の方向と交差する第２の方向に配列した第２の部分線源格子２０４とを備える。第１の部分線源格子は第１の方向に湾曲した形状を有し、第２の部分線源格子は第２の方向に湾曲した形状を有する。【選択図】図３
