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 14: Exposure Calculations<br />
Properly exposing a radiograph is <strong>of</strong>ten a trial and error process, as there are<br />
many variables that affect the final radiograph. In this section we make the<br />
assumptions <strong>of</strong> a generic (and fixed characteristic) x-ray source, fixed film<br />
type, and fixed quality <strong>of</strong> development.<br />
The applet below estimates the density <strong>of</strong> the radiograph based on material,<br />
thickness, geometry, energy (voltage), current, and, <strong>of</strong> course, time. The<br />
effect <strong>of</strong> the energy and the physical setup are shown by looking at the film<br />
density after exposure. It should be noted that the applet will differ<br />
considerably from industrial x-ray configurations, and is designed for<br />
demonstration <strong>of</strong> variables in an x-ray system.<br />
Charlie Chong/ Fion Zhang
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