Understanding Neutron Radiography Reading V-Kodak Part 2 of 3

■ Development
♦ Developer Solutions
Prepared developers that are made ready for use by dissolving in water or by
dilution with water provide a carefully compounded formula and uniformity of
results. They are comparable in performance and effective life, but the liquid
form offers greater convenience in preparation, which may be extremely
important in a busy laboratory. Powder chemicals are, however, more
economical to buy. When the exposed film is placed in the developer, the
solution penetrates the emulsion and begins to transform the exposed silver
halide crystals to metallic silver. The longer the development is carried on, the
more silver is formed and hence the denser the image becomes. The rate of
development is affected by the temperature of the solution--as the
temperature rises, the rate of development increases. Thus, when the
developer temperature is low, the reaction is slow, and the development time
recommended for the normal temperature would result in underdevelopment.
When the temperature is high, the reaction is fast, and the same time would
result in over development.
Charlie Chong/ Fion Zhang
Radiography in Modern Industry. Rochester, NY: Eastman Kodak Co. 1980