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Radiographic Setup - Source/Part Orientation
The orientation of the material or component being radiographed
with respect to the radiation source can have a significant effect on
the interpretation of the image. This experiment illustrates that with
one exposure, it is sometimes difficult to accurately identify or size
a defect. Student will make two exposures of the same components at
slightly different orientations and evaluate the differences in the
The results should show that the change in relationship between the
source and two nickels can have a significant effect on the image produced.
Since radiography produces a shadow graph image, it is possible for
two features to appear as one in the image. This is very important when
attempting to interpret a radiograph. Two small defects can appear as
one bigger defect, which would affect defect sizing results. Also, one
defect could go completely undetected if it were hidden by the shadow
of another defect or feature of the component being radiographed.