Understanding Neutron Radiography Reading V-Kodak Part 2 of 3

This control is accomplished by hardener in the developer and additional
hardener in the fixer to hold the thickness and tackiness of the emulsion
within the limits required for reliable transport, as well as for rapid washing
and drying. It is also desirable that automated processing provide rapid
access to a finished radiograph. This is achieved in part by the composition of
the processing solutions and in part by using them at temperatures higher
than those suitable for manual processing of film. The hardening developer
develops the film very rapidly at its normal operating temperature. Moreover,
the formulation of the solution is carefully balanced so that optimum
development is achieved in exactly the time required for the hardener to
harden the emulsion. If too much hardener is in a solution, the emulsion
hardens too quickly for the developer to penetrate sufficiently, and
underdevelopment results. If too little hardener is in the solution, the
hardening process is slowed, overdevelopment of film occurs, and transport
problems may be encountered. To maintain the proper balance, it is essential
that developer solution be replenished at the rate proper for the type or types
of film being processed and the average density of the radiographs.
Charlie Chong/ Fion Zhang
Radiography in Modern Industry. Rochester, NY: Eastman Kodak Co. 1980