Which step in x-ray processing involves removing unexposed silver halide crystals from the film?

The fixing step in x-ray processing is crucial because it involves removing unexposed silver halide crystals from the film. During the development phase, the exposed silver halide crystals are converted into metallic silver, which forms the image. However, the unexposed crystals remain on the film and must be eliminated to prevent fogging and ensure the permanence of the image.

The fixing process uses a chemical solution, typically known as a fixer, which dissolves the unexposed silver halide crystals, making the remaining image more stable and allowing it to be viewed without further exposure to light or processing. This step is vital for achieving a clear and sharp final image.

In contrast, developing is focused on turning the exposed crystals into an image, drying is about removing any excess moisture from the film after processing, and rinsing is typically a preparatory step rather than one that removes unexposed crystals. Understanding the role of each step highlights the importance of fixing in preserving the quality of x-ray images.