Neutron Imaging by Unknown

Author:Unknown
Language: eng
Format: epub
ISBN: 9789811662737
Publisher: Springer Singapore

(6.11)

where σ is the scattering cross-section, N the particle density and R is a parameter with the dimension of a length specifying an average size or correlation length in the scattering object. In contrast to the phase shift, with this definition of small-angle scatter signal, one can reconstruct slices using the conventional linear filter. Using double single-crystal setup, the first attempts to probe the spatial distribution of small-angle scattering signal using a spatially resolved neutron imaging detector have been reported [31]. Figure 6.8 shows three-dimensional phase tomographic reconstruction of the aluminium cylinder with asymmetric hole along with different cut-away sections using analyser-based phase-contrast imaging. Figure 6.9 shows ultrasmall angle X-ray contrast tomography slice images of different concentrations of β-carotene in D2O inside various holes in a square Al matrix.

Fig. 6.8Three-dimensional refraction contrast reconstruction of the sample volume (aluminium cylinder with asymmetric hole drilled); cut-open (a, b); view from top (c); sagittal cut (d); frontal cut (e).

Reproduced from [30] with permission from © Elsevier 2004

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