Film fog can occur due to which condition?

Film fog is primarily caused by light exposure to the film before it has been properly processed, which directly relates to the occurrence of a light leak in the darkroom. When there is a light leak, even a small amount of ambient light can reach the sensitive emulsion of the film, leading to premature exposure. This results in a fogged appearance on the developed film, ultimately affecting the diagnostic quality of the radiographs.

The control of light exposure in the darkroom is crucial for maintaining film quality, and practitioners must ensure that the environment is completely light-tight. This helps in preventing any unwanted fogging and ensures the integrity of the radiographic images are upheld.