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This paper is an overview of the standards in the field of nondestructive testing (NDT) radiography. The objective is to lay the overall framework and direction for more detailed coverage to follow. First, the NDT radiographic system variables are discussed in an effort to point out the need for increased standards activity. This activity should produce better precision in radiographic testing.
A framework of achieving the requisite precision at minimum cost is presented. This framework interrelates radiographic personnel, procedure, equipment and supplies, producing repeatable radiographs. The framework calls for controlling the system, which requires image quality indicators (IQIs) and adequate assurance as to requisite permanence of the radiograph.
The present status and future needs in standardization in each of the areas mentioned is covered. This includes a table of the standards and present activity on each of them.
NDT radiography is a flexible tool. The paper concludes with the challenge of building a more precise radiographic structure.
nondestructive testing, standards, radiography
Product manager, E. I. du Pont de Nemours and Company, Inc., Wilmington, Del.