Tomodensitometry with X- and gamma-rays

For materials testing computerized tomography (CT) offers the great advantage to produce nondestructively maps of the local X-ray absorption inside an object. For radiation sources in the energy range between 0.2 and 1.5 MeV the absorption is proportional to the density. Therefore with CT the density distribution can be determined. For simple cases the absolute value of the density can be measured. Within the reported paper applications on concrete, powder metallurgical parts and ceramics are given. The last two groups of materials are compared for the green and sintered state. (orig./RHM)