Combined X-ray diffraction and absorption tomography using a conical shell beam

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Shevchuk, A., Evans, J.P.O. ORCID: 0000-0001-9831-1461, Dicken, A.J., Elarnaut, F. ORCID: 0000-0003-0189-6665, Downes, D. ORCID: 0000-0002-4886-5260, Godber, S.X. and Rogers, K.D., 2019. Combined X-ray diffraction and absorption tomography using a conical shell beam. Optics Express, 27 (15), pp. 21092-21101. ISSN 1094-4087

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Official URL: http://doi.org/10.1364/oe.27.021092

Abstract

We combine diffraction and absorption tomography by raster scanning samples through a hollow cone of pseudo monochromatic X-rays with a mean energy of 58.4 keV. A single image intensifier takes 90x90 (x,y) snapshots during the scan. We demonstrate a proof-of-principle of our technique using a heterogeneous three-dimensional (x,y,z) phantom (90x90x170 mm3) comprised of different material phases, i.e., copper and sodium chlorate. Each snapshot enables the simultaneous measurement of absorption contrast and diffracted flux. The axial resolution was ~1 mm along the (x,y) orthogonal scan directions and ~7 mm along the z-axis. The tomosynthesis of diffracted flux measurements enable the calculation of d-spacing values with ~0.1 Å full width at half maximum (FWHM) at ~2 Å. Thus the identified materials may be color-coded in the absorption optical sections. Characterization of specific material phases is of particular interest in security screening for the identification of narcotics and a wide range of homemade explosives concealed within complex "everyday objects." Other potential application areas include process control and biological imaging.

Item Type:

Journal article

Publication Title:

Optics Express

Creators:

Shevchuk, A., Evans, J.P.O., Dicken, A.J., Elarnaut, F., Downes, D., Godber, S.X. and Rogers, K.D.

Publisher:

Optical Society of America

Date:

2019

Volume:

Number: