A lot of slurry fluids have an opaque substance. It is difficult to visualize using previous photograph system with a visible ray. Therefore, we use the X-ray photograph to visualize inside a slurry fluid. And also to capture three-dimensional flow structure of the slurry flow, we use two X-ray sources and detectors. Time-serial data of the particle position are obtained by particle tracking and stereo-pair matching techniques. 3-Dimensional velocity vectors inside the slurry fluid are obtained
