High energy, high resolution monochromatic x-ray computed tomography system

Abstract

We have developed a high energy, high resolution monochromatic x-ray computed tomography system using synchrotron radiation. Our system is installed in a vertical wiggler beamline at the Photon Factory of the National Laboratory for High Energy Physics that can produce high brilliance x-rays in the high energy region. At the present stage, we have obtained monochromatic x-rays up to 75 keV, succeeded in taking computed tomography images of materials up to 50 keV with large absorption coefficients that could not be imaged by conventional methods, and observed three-dimensional fine structures in such materials. When the K-edge subtraction method was applied, the system could quantitatively and nondestructively measure the trace distribution of a specific element in the object of interest. In this paper we introduce the experimental system, mainly the crystal monochromator, evaluate the results, and discuss the performance of the system.