FIFTH CANADIAN CONFERENCE ON NONDESTRUCTIVE ... - IAEA

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NDT - RADIOGRAPHIC PROCESSING QUALITY CONTROL
W.E.J. McKinncy
E.I. Vu Pont Vz Nzmoun.* S Co., Inc.
iflilm-ington,
U.S.A.
NDT - RADIOGRAPHIC
PROCESSING QUALITY CONTROL
ABSTRACT
In radiography much skill and equipment go into the latent image formation:
source, film, holder, technique, set-up time, exposure time, and safety.
After the exposure the film is processed in a chemical to form the useful
visible image. Actually many films, hundreds of films, are processed by one
central processor. The best technique and the best film, subjected to
inferior processing will produce an inferior visible image. This paper
discusses ways to control processing quality.
INTRODUCTION
The fundamental tenant of Statistical Quality Control is to define the
process, monitor the process, and respond when the process fails. The
process in processing is the oxidation/reduction chemical reaction that
converts the latent image into the visible image. It is a process that
operates close to optimal. When and how it deviates from optimal directly
affects film quality equally.