Patent ID: 8233587

Claim:
A source grating for a Talbot-Lau-type interferometer, comprising: a plurality of channels including incident apertures provided on a side irradiated with X-rays and exit apertures provided on an opposite side of the side irradiated with the X-rays, the exit apertures having an aperture area smaller than an aperture area of the incident apertures, wherein the exit apertures of the channels are arranged at a pitch Po that satisfies the following expression: Po=n×Ps× ( L/d ) where Ps represents a pitch of interference fringes of a Talbot self-image, L represents a distance from the source grating in the Talbot-Lau-type interferometer, d represents a distance from the phase grating to an absorption grating in the Talbot-Lau-type interferometer, and n is an arbitrary natural number.