Understanding Neutron Radiography Reading V-Kodak Part 2 of 3

Illumination
The processing area must be provided with both white light and safelight
illumination. White light is desirable for many activities, including cleaning and
maintenance. Since excessive exposure of film to safelight illumination will
result in fog, the arrangement of the safelight lamps must be carefully
considered. A manual processing room should be divided into three zones of
safelight intensity: The brightest, in which the films are washed and placed in
the dryer; the medium zone, where films are developed and fixed; and the
dimmest zone, where loading-bench activities are carried on. Only one level
of illumination is usually provided in a processing room for automatic
processing, since the manipulation of unprocessed film is reduced to a
minimum. The "safeness" of processing room illumination depends equally on
the use of the proper safelight filter, the use of the proper wattage of bulb, the
proper placement of lamps with respect to film, and not exceeding the
maximum "safe" time of exposure of the film to safelight illumination.
Charlie Chong/ Fion Zhang
Radiography in Modern Industry. Rochester, NY: Eastman Kodak Co. 1980