A computerized tomography system has been developed suitable for the examination of inanimate objects of widely varying composition and shape. Photons provided by x-ray tubes and isotopic sources have been utilized to scan various industrial objects. Transmitted x rays or 15-rays have been detected with plastic scintillators operated in the photon (pulse) counting mode. Tomograms (cross-sectional density maps) have been reconstructed for a number of objects, including polypropylene cartridge filters, concrete piers, electric power poles, steel I-beams, and electronic components. The results indicate that the technique will find extensive application in quality control, in manufacturing processes, periodic inspection of structural elements subjected to deteriorating forces such as stress or environment, and non-destructive testing in general.
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Ellinger et al. (1979) studied this question.