Understanding NRT- Reading 1- 2 of 2- Radiogaphic Testing A

It should be verified that the radiograph was produced to the correct density
on the required film type, and that it contains the correct identification
information. It should also be verified that the proper image quality indicator
was used and that the required sensitivity level was met. Next, the radiograph
should be checked to ensure that it does not contain processing and handling
artifacts that could mask discontinuities or other details of interest. The
technician should develop a standard process for evaluating the radiographs
so that details are not overlooked.
Once a radiograph passes these initial checks it is ready for interpretation.
Radiographic film interpretation is an acquired skill combining, visual acuity
with knowledge of materials, manufacturing processes, and their associated
discontinues. If the component is inspected while in service, an
understanding of applied loads and history of the component is helpful. A
process for viewing radiographs, left to right top to bottom etc., is helpful and
will prevent overlooking an area on the radiograph. This process is often
developed over time and individualized. One part of the interpretation process,
sometimes overlooked, is rest. The mind as well as the eyes need to
occasionally rest when interpreting radiographs.
Charlie Chong/ Fion Zhang