NOTE: The black particles represent small quantities of black metallic silver.
Figure 1-4. Photomicrograph (400X) of a cross-section of an x-ray film showing
an exposed and developed emulsion layer.
c. Protective Coating. The emulsion is coated with a thin, transparent material
to protect it during handling and storage. Figure 1-5 shows the composition of x-ray
film.
1-4.
PRODUCTION OF THE LATENT IMAGE
a. When the x-ray film emulsion is sensitized during manufacture, the silver
bromide crystals are left in a state of suspended animation awaiting the x-ray stimulus
to start them on their way to becoming a radiographic image. The potentiality for
this activity exists in the tiny sensitization "specks" at the surface of the crystal
(A, figure 1-6). When x-ray exposure occurs, the latent image is produced.
MD0954
1-5
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