Understanding Neutron Radiography Reading V-Kodak Part 2 of 3

Technique
■ Exposure of Control Film
Load the cassette with a sheet of control film. (If the control film has been
refrigerated, be sure to allow enough time for the film to reach room
temperature before handling.) If lead intensifying screens are used in the
normal production operation, use the set reserved for process control.
Carefully set up the x-ray exposure unit for the exposure technique. The
cassette and the stepped wedge must be positioned identically each time
control film is exposed. Cut the exposed film into a minimum of twice the
number of processors in the control system. If possible, cut more than the
minimum, but do not make duplicate exposures and assume they are
identical. Each exposure of control film must be considered a complete
control. Identify the strips as to date and exposing unit. Place half or the
exposed control strips in an airtight, light tight, and moisture proof wrapper
and store them in the refrigerator. Remove the moisture proof package of
control strips exposed in the same unit the previous day. When these latentmage
control strips are at room temperature, they can be handled and
processed.
Charlie Chong/ Fion Zhang
Radiography in Modern Industry. Rochester, NY: Eastman Kodak Co. 1980