Computerized tomography with thermal neutrons

The results of the measurements show that CT with thermal neutrons is well suited for nondestructive examination of materials, especially if inhomogeneities in ceramics and objects containing adjacent elements have to be investigated. Using monoenergetic neutrons allows to adjust the physical contrast by change of the neutron energy. The long overall measuring times due to low neutron flux densities can be decreased by using the difference method instead of the conventional filtered backprojection method. They can be decreased further by using two dimensional position sensitive detectors in the parallel beam method. (orig.)