fog (redirected from Valley fog)

fog (fog) a colloid system in which the dispersion medium is a gas and the disperse particles are liquid.

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fog (fogging),

n See film fault, fogged.

fog, chemical,

n See film fault.

fog, dyschroic,

n See film fault, dyschroic fog.

fog, light,

n See film fault.

fog, radiation,

n the film darkening caused by radiation from sources other than intentional exposure to the primary beam; e.g., film may be exposed to scatter radiation, or accidental exposure may occur if stored film is not protected from radiation.

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fog

1. a colloid system in which the dispersion medium is a gas and the dispersed particles are liquid.

2. regrowth after harvesting of a cereal crop. Called also aftermath, feg.

3. obscuring opacity on an x-ray film.

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basic fog

blackening of an unexposed x-ray film after development.

fog fever

see atypical interstitial pneumonia.

x-ray fog

local or general exposure to extraneous radiation, light or chemical action which is additional to the true photographic image. Leads to spoiling of the x-ray image.