Understanding Neutron Radiography Reading V-Kodak Part 2 of 3

Chapter 11: Process Control
Users of industrial radiography must frequently meet requirements of density
and sensitivity set forth in inspection specifications. They must also keep the
radiograph rejection rate to a minimum. Control of variability in both exposing
and film processing is essential if these requirements are to be met. Although
exposure and processing are the most frequent sources of significant
variations, other factors, such as intensifying screens and film, also contribute
to radiographic variability. The exposure of industrial x-ray film to energy in
the visible spectrum is not a reliable indicator of the process level or the
repeatability of exposures to x-radiation. Therefore, exposure of the control
film to white light is not a satisfactory tool for controlling process variability in
industrial radiography. In the procedure for controlling either the exposing unit
or the film processing, or both, described here, x-radiation is used to expose
the control film.
Charlie Chong/ Fion Zhang
Radiography in Modern Industry. Rochester, NY: Eastman Kodak Co. 1980