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High energy high resolution monochromatic x-ray computed tomography using the Photon Factory vertical wiggler beamline : Proceedings of the 4th international conference on synchrotron radiation instrumentation (1992)

Nagata, Y. ; Yamaji, H. ; Hayashi, K. ; [et al.]

[S.l.] : American Institute of Physics (AIP)

Review of Scientific Instruments 63 (1992), S. 615-618

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ISSN: 1089-7623

Source: AIP Digital Archive

Topics: Physics , Electrical Engineering, Measurement and Control Technology

Notes: We have developed a high resolution monochromatic x-ray computed tomography system using synchrotron radiation in the energy range up to 50 keV. The system was installed in a vertical wiggler beamline (BL14C) at the Photon Factory of the National Laboratory for High Energy Physics, and consists of a double-crystal monochromator employing asymmetric Bragg reflections, a photodiode array detector with a phosphor screen, and a microcomputer for control. Computed tomography (CT) images with a pixel size of 6 to 8 μm and with a slice width ranging from 20 to 100 μm were obtained. An image subtraction technique for CT images above and below the x-ray absorption edge of iodine was also evaluated for liquid-containing glass capillaries. Since the CT value (pixel weighting) is linearly proportional to the concentration, the system can quantitatively evaluate the concentration distribution of iodine. These results indicate that the system is very useful for nondestructively evaluating fine structures and their constituent elements.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1063/1.1142668

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Electronic Resource

High energy, high resolution monochromatic x-ray computed tomography system (1992)

Nagata, Y. ; Yamaji, H. ; Hayashi, K. ; [et al.]

Springer

Research in nondestructive evaluation 4 (1992), S. 55-78

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ISSN: 1432-2110

Source: Springer Online Journal Archives 1860-2000

Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics

Notes: 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.