Australian Dental Council (ADC) Practice Test 2026 - Free ADC Practice Questions and Study Guide

X-ray film emulsions are primarily composed of silver bromide crystals suspended in a gelatin medium. Silver bromide is a light-sensitive material that captures the image when exposed to radiation. The gelatin serves as a protective and supportive medium for the silver bromide crystals, allowing for uniform distribution and ensuring that the film can react appropriately to light exposure during the imaging process.

This composition is critical for the functioning of the X-ray film, as the silver bromide is responsible for the film's ability to create an image in a way that is effective for diagnostic purposes. The process of film development involves converting the exposed silver bromide to metallic silver, which forms the visible image.

The other options listed do not correctly represent the composition of X-ray film emulsions. Silver nitrate is not used in film emulsions, and while metallic silver is a product of film development, it is not a component of the emulsion itself.