a. False. Most films usually have a double layer of emulsion attached to a polyester film base. This allows increased speed as two intensifying screens can be used. Mammography films usually are single-layered. 

b. False. Silver bromide is most commonly used. 

c. True. The larger the grain size, the faster the film. Larger grains provide a larger target for the light photons and so fewer photons are required to produce the image. 

d. False. Both the anion (bromide) and cation (silver) are required to produce the latent image: the bromide is the electron donor and the silver ion becomes deposited and later converted to the black silver atom to produce the image. 

e. False. Post-processing is vital in converting the latent image to a visible image. This requires the conversion of silver ions to visible silver atoms (electron gain) from electron donors (e.g. phenidone and hydroquinone), a process known as film development. Unexposed grains also need to be removed from the film (to render the film stable in light) and the process of development halted to prevent fogging, a process known as fixing.