Quantification of the neutron dark-field imaging signal in grating interferometry

Gruenzweig C, Kopecek J, Betz B, Kaestner AP, Jefimovs K, Kohlbrecher J, Gasser U, Bunk O, David C, Lehmann EH, Donath T, Pfeiffer F (2013)

Publication Type: Journal article

Publication year: 2013

Journal

Physical Review B - Condensed Matter and Materials Physics American Physical Society (APS)

Book Volume: 88

Article Number: 125104

Journal Issue: 12

DOI: 10.1103/PhysRevB.88.125104

Abstract

Here we report on a mathematical description for the neutron dark-field image (DFI) contrast based on the influence of the thickness-dependent beam broadening caused by scattering interactions and multiple refraction in the sample. We conduct radiography experiments to verify that the DFI signal exponentially decays as a function of thickness for both magnetic and nonmagnetic materials. Here we introduce a material-dependent parameter, the so-called linear diffusion coefficient Ω. This allows us to perform a quantitative DFI-computed tomography. Additionally, we conduct correlative small-angle neutron-scattering experiments and validate the mathematical assumption that the angular broadening of the direct beam is proportional to the square root of the number of discrete layers. © 2013 American Physical Society.

Involved external institutions

Paul Scherrer Institute (PSI) CH Switzerland (CH) Institute of Physics of the Czech Academy of Sciences / Fyzikální ústav Akademie věd České republiky (FZU) CZ Czech Republic (CZ) Eidgenössische Materialprüfungs- und Forschungsanstalt (Empa) / Swiss Federal Laboratories for Materials Science & Technology CH Switzerland (CH) Technische Universität München (TUM) DE Germany (DE)

How to cite

APA:

Gruenzweig, C., Kopecek, J., Betz, B., Kaestner, A.P., Jefimovs, K., Kohlbrecher, J.,... Pfeiffer, F. (2013). Quantification of the neutron dark-field imaging signal in grating interferometry. Physical Review B - Condensed Matter and Materials Physics, 88(12). https://doi.org/10.1103/PhysRevB.88.125104

MLA:

Gruenzweig, C., et al. "Quantification of the neutron dark-field imaging signal in grating interferometry." Physical Review B - Condensed Matter and Materials Physics 88.12 (2013).

BibTeX: Download