Double emulsion film

Last revised by Calum Worsley on 13 Feb 2024

Double emulsion film is a type of x-ray film that contains emulsion on both sides of the base. They have a thin layer of emulsion on both sides to absorb light from the front and back of the intensifying screen. Both emulsions contribute to the overall radiographic density of the film. They usually have higher speed than single emulsion x-ray films.

The rationale behind applying emulsion on both sides of the x-ray film is to avoid the shrinking of emulsion during the drying process. This can lead to more curvature on one-side.

Moreover, the presence of emulsion on both sides of the film has the additional advantage of enhancing the film speed when used in conjunction with intensifying screens. The intensifying screens emit light in response to x-ray exposure, thereby amplifying the x-ray signal and facilitating a faster image formation process on both the emulsions. Thus the overall image is the sum of two the densities on both emulsions. This, however, leads to a decrease in image sharpness caused by the parallax effect 2.

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