What is fog in radiographic film?

Fog. Fog in radiology refers to darkening of images by sources other than the radiation of the primary beam to which the film was exposed. This can be due to chemicals in the processing solutions, light, or non primary beam radiation.

How does film get fogged?

Film often fogs for two reasons; age or uncontrolled light exposure. With age, the film exhibits similar characteristics as with the first image. The fogging effect is evenly distributed throughout the length of the film.

What does fogged film look like?

A film that is either fully black, or has partial black marks indicates that the film has been fogged. (Exposed to light). Fogging could arise in the following stages: Loading a film into a camera.

What color is fogged film?

By step 4, it is completely exposed. To determine if film has been fogged, take a sheet of unexposed x-ray film and send it through the film processor. When the film comes out, it should be clear or have a very light blue tint. If the film looks gray, it has been fogged.

What is this fog?

Fog shows up when water vapor, or water in its gaseous form, condenses. During condensation, molecules of water vapor combine to make tiny liquid water droplets that hang in the air. You can see fog because of these tiny water droplets. Water vapor, a gas, is invisible. Fog happens when it’s very, very humid.

What is chemical fog?

Chemical fogging, particularly H2O2 or hydrogen peroxide fogging, is an efficient and effective way to sanitize a controlled or indoor environment. The hydrogen peroxide itself is a powerful decontaminate, and when released in an aerosol form, it is capable of achieving a 6-log kill.

Why are my film photos cloudy?

The most common reasons that lead to unsharp film photos are motion blur, caused by using too slow a shutter speed; missed focus, caused by not having enough depth of field to work with; and underexposure, caused by not exposing for the shadows.

How do you know if a film is overexposed?

It doesn’t matter if the photo is in color or black and white.

  1. If a photo is too dark, it is underexposed. Details will be lost in the shadows and the darkest areas of the image.
  2. If a photo is too light, it is overexposed. Details will be lost in the highlights and the brightest parts of the image.

Is fog a solution?

Fog is a colloid since it is a heterogeneous mixture of water, air and suspension particles.