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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Real-time Radiography<br />
Real-time radiography (RTR), or real-time radioscopy, is a nondestructive test<br />
(NDT) method whereby an image is produced electronically rather than on<br />
film so that very little lag time occurs between the item being exposed to<br />
radiation and the resulting image. In most instances, the electronic image that<br />
is viewed, results from the radiation passing through the object being<br />
inspected and interacting with a screen <strong>of</strong> material that fluoresces or gives <strong>of</strong>f<br />
light when the interaction occurs. The fluorescent elements <strong>of</strong> the screen form<br />
the image much as the grains <strong>of</strong> silver form the image in film radiography.<br />
The image formed is a "positive image" since brighter areas on the image<br />
indicate where higher levels <strong>of</strong> transmitted radiation reached the screen. This<br />
image is the opposite <strong>of</strong> the negative image produced in film radiography. In<br />
other words, with RTR, the lighter, brighter areas represent thinner sections<br />
or less dense sections <strong>of</strong> the test object.<br />
Charlie Chong/ Fion Zhang
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