Understanding NRT- Reading 1- 2 of 2- Radiogaphic Testing A
Understanding nrt reading 1- 2 of 2- radiogaphic testing a
Understanding nrt reading 1- 2 of 2- radiogaphic testing a
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Chapter 8: Image Considerations<br />
The most common detector used in industrial radiography is film. The high<br />
sensitivity to ionizing radiation provides excellent detail and sensitivity to<br />
density changes when producing images <strong>of</strong> industrial materials. Image quality<br />
is determined by a combination <strong>of</strong> variables: radiographic contrast and<br />
definition. Many variables affecting radiographic contrast and definition are<br />
summarized below and addressed in following sections.<br />
Radiographic Contrast<br />
Radiographic contrast describes the differences in photographic density in a<br />
radiograph. The contrast between different parts <strong>of</strong> the image is what forms<br />
the image and the greater the contrast, the more visible features become.<br />
Radiographic contrast has two main contributors: subject contrast and<br />
detector or film contrast.<br />
Charlie Chong/ Fion Zhang
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