Kodak DryView 8300 Service Bulletins page 95

Service & Support
Health Imaging
Kodak DryView 8600/8610 LASER IMAGERS
Technical Bulletin
27-01/02 Purple/Green Reflections on Film
Problem
When the surface of the "antihalation" side of the film is viewed in reflected fluorescent light, purple/green
streaks or wavy colored areas are visible. When the film is viewed in only reflected "incandescent" light,
the colors are not visible.
Cause
Fluorescent TUBES have high quantities of energy in narrow-wavelength bands in the purple/green area of
the visible spectrum. When this light is viewed reflected from the "antihalation" side of the film, the
coherency of these narrow-wavelength bands is enough to cause interference effects in the thin layer on the
"antihalation" side of the film. The effect is a contour map of the thin film thickness in the "antihalation
coating" where the interference occurs.
When this light is viewed reflected from the "antihalation" side of the film, the coherency of these narrow-
wavelength bands is enough to cause interference effects (i.e., a contour map) in the thin-film layer on the
"antihalation" side of the film.
Solution
When the radiologists view the films on a normal light box during transmission, the purple/green variations
or density variations will have no affect on the film reading.
There can be large variations between film lots. Customers who see a large number of variations can order
new film to minimize their concern.
January 2002
Eastman Kodak Company
Health Imaging Products
1 Imation Way
Oakdale, MN 55128
http://www.kodak.com
Printed in the U.S.A.
© Kodak 2002