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

0396487 - FZÚ 2014 RIV US eng J - Journal Article
Grünzweig, C. - Kopeček, Jaromír - Betz, B. - Kaestner, A. - Jefimovs, K. - Kohlbrecher, J. - Gasser, U. - Bunk, O. - David, C. - Lehmann, E. - Donath, T. - Pfeiffer, F.
Quantification of the neutron dark-field imaging signal in grating interferometry.
Physical Review. B. Roč. 88, č. 12 (2012), "125104-1"-"125104-6". ISSN 1098-0121
Institutional support: RVO:68378271
Keywords : neutron scattering (including small-angle scattering) * atom and neutron interferometry
Subject RIV: BM - Solid Matter Physics ; Magnetism
Impact factor: 3.767, year: 2012

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 . 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.
Permanent Link: http://hdl.handle.net/11104/0224244