Limitations of retarded (bisulfite) x-ray film processing Page: 2 of 8
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LIMITATIONS OF RETARDED (BISULFITE) X-RAY FILM PROCESSING
We demonstrate the limitations of using regarded (bisulfite) developer to
abate film sensitivity of x-ray films that have een exposed to intense
radiation. We compared the measured densities of a large number of Kodak
Type-M x-ray film samples exposed to a known fluerre of monochromatic x-rays.
These film samples were processed in three separate batches of bisulfite
developer mixed in the same proportions. We concluded that reproducible
film-density information cannot be obtained using different batches of
(bisulfite) developer solutions.
Retarded developer processing is used to expand the film latitude of
x-ray films that have been exposed to intense device radiation. During a
reexamination of calibration-data files for Kodak Type-M x-ray film, we
uncovered data that demonstrated that this technique is unreliable. These
data showed that the density results of film samples given identical exposures
were inconsistent when the samples were processed in different batches of
bisulfite solution prepared to be as identical as possible. At the time these
tests were made, the known users of bisulfite processing were told of our
results, but no formal report was circulated. This report is intended to
inform potential users of the limitations of the bisulfite processing
RETARDED PROCESSING TECHNIQUE
The addition of sodium metabisulfite to photographic developer is a
well-known technique for expanding the film latitude during the development
stage. This results in decreased optical density in areas of high exposure.
Claude Dittmore of Lawrence Livermore Laboratory (LLL) extended and utilized
this technique over a wide range of x-ray exposures, film types, and developer
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Stoering, J.P. & Dittmore, C. Limitations of retarded (bisulfite) x-ray film processing, report, October 16, 1979; Livermore, California. (https://digital.library.unt.edu/ark:/67531/metadc1092201/m1/2/: accessed March 26, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.