ON NEUTRON TOMOGRAPHY

Two-and three-dimensional reconstructions of objects from projections were performed with one-and two-dimensional detectors. For three-dimen sional reconstruction conventional X-ray films with gadolinium convert ers as two-dimensional detectors have been used with a spatial resolut ion of the reconstruction better than 200 mu m. For two-dimensional re construction small angle scattering and refraction can be used as sign als for high resolution tomographic investigations of matter. These in teractions can only be detected with a double crystal diffractometer, where the analyzer crystal acts as one-dimensional detector. Inhomogen eities less than 20 mu m can be imaged two-dimensionally. (C) 1998 Els evier Science B.V. All rights reserved.