Data display system and method

A method for processing transmission data from neutron and gamma-ray radiation to form an image, the neutron and gamma-ray radiation having traversed through an object and representing a measure of neutron. attenuation and gamma-ray attenuation introduced by the object, comprising forming a neutron mass attenuation matrix 'n' and gamma-ray mass attenuation matrix 'g' from the measure of neutron attenuation and gamma-ray attenuation respectively; calculating a composition matrix R whose elements R are defined as a function of elements n from 'n' and the corresponding elements. g from 'g', R representing an average composition of material between a source Which generated the radiation and a point (i,j); calculating a density matrix X whose elements X are defined as a function of the elements n from 'n' and the corresponding elements g from 'g', X representing an approximate amount of material between the radiation source and the point (i,j); calculating a quality matrix Q as a function of the elements n from the 'n' and the elements g from 'g', Q representing a measure of the reliability of the elements of R; and forming an image for display; wherein the image contains information from R, X and Q.