NDT Methods: Radiography

Radiography Is a non-destructive method of inspecting materials for hidden flaws by utilizing the ability of electromagnetic radiations of short wave-length to penetrate these materials. The value of the ability lies in the fact that the penetrating radiation is absorbed by the material to a degree dependent upon its composition and thickness. Since the amount of radiation emerging from the opposite side of the material can be detected and measured on film, variations in this amount or intensity of radiation are used to determine thickness or composition of the material.

Because of the penetration and absorption capabilities of X and Gamma radiation, radiography is used to test a variety of non-metallic products and metallic products such as welds, castings, forgings and fabrications. Since it is capable of revealing discontinuities (variations in material composition or density) in a variety of dissimilar materials, radiographic testing is a primary non-destructive test method.

Radiographic testing usually requires exposing film to X or Gamma rays that have penetrated a specimen, processing the exposed film and interpreting the resultant radiograph. There are many variables in these procedures and successful completion of any test is dependent upon understanding and control of the variables. Because of the inherent energies emitted by the radiations employed are harmful to human organisms, special care and procedures must be followed when handling radiographic radiation emitting equipment.

NDT Methods
 

West-Can Inspection Limited provides an Inspection and Non-Destructive Testing and Failure Analysis service for the detection and evaluation of materials relative to their quality and condition through our mobile and laboratory facilities. WEST-CAN INSPECTION LIMITED is a private company incorporated in 1969 in Winnipeg, Manitoba.


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