We demonstrate a new analytical X-ray computed tomography technique for \nempirical linear relationship between the X-ray mass attenuation coefficient of the materials\nand X-ray energy was found for X-ray energies between 8 keV and 30 keV. The mass densityvisualizing\nand quantifying the mass density of materials comprised of low atomic number elements\nwith unknown atomic ratios. The mass density was obtained from the experimentally\nobserved ratio of the imaginary and real parts of the complex X-ray refractive index. An\nimage of two polymer fibers was quantified using the proposed technique using a scanning-\ntype X-ray micro beam computed tomography system equipped with a wedge\nabsorber. The reconstructed mass density agrees well with the calculated one.
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