Results 

Data have been collected with several test scenarios using the small-scale prototype detector system in Glasgow. The latest results were taken with a 12mm-thick stainless steel drum filled with concrete and several high-Z materials. A simulation of this setup is shown opposite without the outermost modules.


Horizontal (10mm-thick) and vertical (5mm-thick) tomograms reconstructed from an experimental data run are shown below. Slices are taken through regions containing a uranium (top) and lead (bottom) sample. The circular cross-section of the barrel are seen in the horizontal slice (left) with the smooth inner distribution of concrete. In the centre the small 2cm-diameter, 3cm-long cylinder of uranium has been clearly reonstructed with millimetre-order precision. At the bottom of this image, the hollow support arm for the barrel has also been successfully imaged. In the vertical slice (right), the upright orientation of the uranium sample is observed. Similar features are observed for the 4cm cube of lead.