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Proceedings Paper

Tomography using monochromatic thermal neutrons with attenuation and phase contrast
Author(s): Francois Dubus; Ulrich Bonse; Theodor Biermann; Matthias Baron; Felix Beckmann; Michael Zawisky
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Paper Abstract

Attenuation-contrast tomography with monochromatic thermal neutrons was developed and operated at guide station S18 of the institute Laue-Langevin in Grenoble. From the S18 spectrum the neutron wavelength (lambda) equals 0.18 nm was selected by employing a fore crystal with the silicon 220 reflection at a Bragg angle (Theta) equals 30 degrees. Projections were registered by a position sensitive detector (PSD) consisting of a neutron-to-visible-light converter coupled to a CCD detector. Neutron tomography and its comparison with X-ray tomography is studied. This is of special interest since the cross section for neutron attenuation ((sigma) atom) and the cross section for neutron phase shift (bc) are isotope specific and, in addition, by no means mostly monotonous functions of atomic number Z as are attenuation coefficient ((mu) x) and atomic scattering amplitude (f) in the case of X-rays. Results obtained with n-attenuation tomography will be presented. Possibilities and the setup of an instrument for neutron phase-contrast tomography based on single-crystal neutron interferometry will be described.

Paper Details

Date Published: 7 January 2002
PDF: 12 pages
Proc. SPIE 4503, Developments in X-Ray Tomography III, (7 January 2002); doi: 10.1117/12.452864
Show Author Affiliations
Francois Dubus, Univ. Dortmund and Technische Univ. Wein (Austria)
Ulrich Bonse, Univ. Dortmund (Germany)
Theodor Biermann, Univ. Dortmund (Germany)
Matthias Baron, Institut Laue-Langevin (France)
Felix Beckmann, Deutsches Elektronen-Synchrotron/HASYLAB (Germany)
Michael Zawisky, Technische Univ. Wein (Austria)

Published in SPIE Proceedings Vol. 4503:
Developments in X-Ray Tomography III
Ulrich Bonse, Editor(s)

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