Reference Radiographs

摘要

It is often said that "one picture is worth a thousand words." This is especially true when trying to describe the appearance of certain types of discontinuities which are so often seen in industrial radiography. Discontinuities in castings such as sponge or dendritic shrinkage are difficult, if not impossible, to describe in words. Gas porosity in weldments or in aluminum and magnesium castings is another example of a discontinuity which does not lend itself well to description by the written word. These discontinuities can readily by evaluated by comparing them to a reference radiograph of the same discontinuity type.