Počet záznamů: 1  

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

  1. 1.
    0396487 - FZÚ 2014 RIV US eng J - Článek v odborném periodiku
    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
    Institucionální podpora: RVO:68378271
    Klíčová slova: neutron scattering (including small-angle scattering) * atom and neutron interferometry
    Kód oboru RIV: BM - Fyzika pevných látek a magnetismus
    Impakt faktor: 3.767, rok: 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.
    Trvalý link: http://hdl.handle.net/11104/0224244

     
     
Počet záznamů: 1  

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