NEUTRON TOMOGRAPHY
Tomography is the process of reconstructing a three-dimensional distribution of an attenuation coefficient from a multitude of two-dimensional projections of the sample, taken from different angles. In principle, tomography can be performed with any non-dispersive radiation. With the availability of large areas digital neutron detectors and more powerful computers, neutron tomography is rapidly gaining importance throughout research facilities in the world. This paper provides an introduction to the tomography principle and stresses the importance of neutron beam design for high quality of neutron tomographic images. Several examples taken at the Paul Scherrer Institute and at the Technical University Munich are presented.