Understanding Neutron Radiography Reading V-Kodak Part 2 of 3

Although the lines of an exposure chart are normally straight, they should in
most cases be curved--concave downward. The straight lines are convenient
approximations, suitable for most practical work, but it should be recognized
that in most cases they are only approximations. The degree to which the
conventionally drawn straight line approximates the true curve will vary,
depending on the radiographic conditions, the quality of the exposing
radiation, the material radiographed, and the amount of scattered radiation
reaching the film. In addition, time, temperature, degree of activity, and
agitation of the developer are all variables that affect the shape of the
characteristic curve and should therefore be standardized. When, in hand
processing, the temperature or the activity of the developer does not
correspond to the original conditions, proper compensation can be made by
changing the time according to methods described in "Control of Temperature
and Time". Automated processors should be carefully maintained and
cleaned to achieve the most consistent results. In any event, the greatest of
care should always be taken to follow the recommended processing
procedures.
Charlie Chong/ Fion Zhang
Radiography in Modern Industry. Rochester, NY: Eastman Kodak Co. 1980