Abstract
A prototype position-sensitive neutron detector was designed and built for two- and three-dimensional tomographic imaging of materials and complex assemblies. The detector system consists of an LiF-ZnS scintillator screen optically coupled to a cooled charge-coupled device (CCD). Practical resolution limits of the single-screen system were calculated to be approximately 100 mu m, determined by the neutron-beam divergence and the resolution of the scintillator screen. Contrast resolution in a (200- mu m)/sup 3/ volume element was calculated to be 1% of the cross section in small samples. The system included the MIT Research Reactor as a thermal neutron source (nominal flux approximately 2.4*10/sup 8/ n degrees /cm-/sup 2/s), a rotating sample holder, and the two-dimensional position-sensitive detector. The effects of scatter were estimated and compared to data. Two- and three-dimensional tomograms of phantoms and several demonstration objects, including a control valve and an oil well dolomite core sample, were obtained. >
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