Understanding Neutron Radiography Reading V-Kodak Part 2 of 3

Even though the final radiograph so processed is apparently satisfactory,
there is no assurance that development was carried far enough to give the
desired degree of film contrast. (See "Effect Of Development Time On Speed
And Contrast".) Further, "sight development" can easily lead to a high level of
fog caused by excessive exposure to safelights during development. An
advantage of standardized time-temperature processing is that by keeping
the degree of development constant a definite check on exposure time can
always be made. This precludes many errors that might otherwise occur in
the production of radiographs. When the processing factors are known to be
correct but the radiographs lack density, underexposure can be assumed;
when the radiographic image is too dense, overexposure is, indicated. The
first condition can be corrected by increasing the exposure time; and the
second, by decreasing it. The methods for calculating the required changes in
exposure are given in Arithmatic of Exposure.
Charlie Chong/ Fion Zhang
Radiography in Modern Industry. Rochester, NY: Eastman Kodak Co. 1980