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Symmetric Talbot-Lau neutron grating interferometry and incoherent scattering correction for quantitative dark-field imaging.

  • Kim Y School of Mechanical Engineering, Pusan National University, Busan, Republic of Korea.
  • Valsecchi J Laboratory for Neutron Scattering and Imaging, Paul Scherrer Institut, Villigen, Switzerland.
  • Kim J Neutron Science Center, Korea Atomic Energy Research Institute, Daejeon, Republic of Korea.
  • Lee SW School of Mechanical Engineering, Pusan National University, Busan, Republic of Korea. seunglee@pusan.ac.kr.
  • Strobl M Laboratory for Neutron Scattering and Imaging, Paul Scherrer Institut, Villigen, Switzerland. markus.strobl@psi.ch.
  • 2019-12-14
Published in:
  • Scientific reports. - 2019
Multidisciplinary
English We introduce the application of a symmetric Talbot-Lau neutron grating interferometer which provides a significantly extended autocorrelation length range essential for quantitative dark-field contrast imaging. The highly efficient set-up overcomes the limitation of the conventional Talbot-Lau technique to a severely limited micrometer range as well as the limitation of the other advanced dark-field imaging techniques in the nanometer regime. The novel set-up enables efficient and continuous dark-field contrast imaging providing quantitative small-angle neutron scattering information for structures in a regime from some tens of nanometers to several tens of micrometers. The quantitative analysis enabled in and by such an extended range is demonstrated through application to reference sample systems of the diluted polystyrene particle in aqueous solutions. Here we additionally demonstrate and successfully discuss the correction for incoherent scattering. This correction results to be necessary to achieve meaningful quantitative structural results. Furthermore, we present the measurements, data modelling and analysis of the two distinct kinds of cohesive powders enabled by the novel approach, revealing the significant structural differences of their fractal nature.
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  • English
Open access status
gold
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https://sonar.ch/global/documents/186828
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