Each of the following statements is true EXCEPT one. Which one is the EXCEPTION?

a. During exposure, the x-rays strike and ionize all silver halide crystals on the film.
b. The invisible image on an x-ray film is called the "latent image."
c. The function of the gelatin in film emulsion is to keep the silver halide crystals evenly suspended over the base.
d. Silver halide in the emulsion is primarily silver bromide.

a. Some, but not all, of the silver halide crystals are ionized. Metal restorations absorb x-ray energy and prevent the radiation from reaching the film. Denser tissues such as enamel and bone absorb x-ray energy and prevent much more of it from reaching the film than less dense structures such as dentin or pulp.