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

Chapter 10: Viewing Radiographs
Radiographs (developed film exposed to x-ray or gamma radiation) are
generally viewed on a light-box. However, it is becoming increasingly
common to digitize radiographs and view them on a high resolution monitor.
Proper viewing conditions are very important when interpreting a radiograph.
The viewing conditions can enhance or degrade the subtle details of
radiographs.
Viewing Radiographs
Before beginning the evaluation of a radiograph, the viewing equipment and
area should be considered. The area should be clean and free of distracting
materials. Magnifying aids, masking aids, and film markers should be close at
hand. Thin cotton gloves should be available and worn to prevent fingerprints
on the radiograph. Ambient light levels should be low. Ambient light levels of
less than 2 fc are often recommended, but subdued lighting, rather than total
darkness, is preferable in the viewing room. The brightness of the
surroundings should be about the same as the area of interest in the
radiograph. Room illumination must be arranged so that there are no
reflections from the surface of the film under examination.
Charlie Chong/ Fion Zhang