Radiographic techniques: principles

Abstract

Ideally, the choice of a technique ought to be made in terms of a required defect sensitivity, but it is seldom possible for users to state categorically the size of the smallest defect which they wish to detect. Consequently, the choice of technique is frequently made in terms of some other factor such as convenience or availability of equipment, time involved etc. Not all radiographs are required to have high defect sensitivity, but it is seldom that sensitivity is not an important factor. It is necessary, therefore, to understand the interplay of the various parameters in each technique from the viewpoint of their effect on sensitivity.