Film-based industrial tomography

Abstract X-ray and gamma-ray tomographic inspection has enormous potential for all stages of industrial quality control. Film-based industrial tomography (FIT) is simple in operation and costs less than computerized tomography bt at least an order of magnitude. In FIT there is relative motion between the source and the examined object; the film is stationary relative to the object. The tomographic image is generated directly on the film. A theoretical model of the tomogram response has been developed and shows that each point of the tomogram includes information obtained from all the angular views. Tomograms of various test objects were recorded with a 160 kV constant potential X-ray unit. The slice thickness of the examined plane through the object is 0.3 to 0.5 mm. The capability of FIT to distinguish composition-density differences is demonstrated. Spatial resolution was measured with test patterns and DIN wire standards. Response of films D4 and D7 as a function of exposure was measured.