Understanding Neutron Radiography Reading V-Kodak Part 2 of 3

Washing
X-ray films should be washed in running water so circulated that the entire
emulsion area receives frequent changes. For a proper washing, the bar of
the hanger and the top clips should always be covered completely by the
running water, as illustrated in Figure 74. Efficient washing of the film
depends both on a sufficient flow of water to carry the fixer away rapidly and
on adequate time to allow the fixer to diffuse from the film. Washing time at 60
to 80° F (15.5 to 26.5° C) with a rate of water flow of four renewals per hour is
30 minutes. (?)
The films should be placed in the wash tank near the outlet end. Thus, the
films most heavily laden with fixer are first washed in water that is somewhat
contaminated with fixer from the films previously put in the wash tank. As
more films are put in the wash tank, those already partially washed are
moved toward the inlet, so that the final part of the washing of each film is
done in fresh, uncontaminated water.
Charlie Chong/ Fion Zhang
Radiography in Modern Industry. Rochester, NY: Eastman Kodak Co. 1980