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Figure 1
The experimental setup for neutron propagation-based phase-contrast measurements with either a pink or a white beam. (a) A schematic diagram of the experimental setup for a high phase contrast/low absorption contrast metal sample and a pink beam, showing the position and angle of the sample relative to the detector and aperture. The coordinate system refers to the phase-retrieval algorithm. (b) A diagram of the metal foil sample consisting of Al (light grey) and Zr (dark grey). Note the width and thicknesses are not on the same scale. (c) A diagram of the setup for white-beam imaging of bone, showing the position of the sample relative to the aperture and detector. (d) A schematic diagram of the sample holder, which could be connected to a pump at the top in order to force liquid through the bone sample that is placed in the middle. A reservoir is present in the bottom to collect liquid. The inset shows a vertical cut through the sample holder, with the sample in the middle packed between O rings and metal pipes holding it in place. The top pipe contains liquid while the bottom pipe is empty. The colour variation across the beams in panels (a) and (c) is to indicate relative wavelength ranges and not to suggest a variation in wavelength across the beam.

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ISSN: 1600-5767
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