X-ray film is an essential supply for those in the x-ray business. If you are interested in a discount on x-ray film or other dental supplies, come visit Mackie X-ray.
X-ray film is a photographic film that has a radiation sensitive emulsion on either one or both sides of a base made of a thin plastic sheet primarily for the purpose of supporting the emulsion. The base of x-ray film is made of plastic so that it can provide a highly transparent, uniform, optical background. The base is both flexible and strong in order to be snapped into a viewbox. The plastic base also has to withstand the distortion that can be caused by heat during the developing process.
The emulsion of x-ray film is a layer (or layers) of the photographic film that consists of silver halide grains. Emulsion is created from a stable mixture of two or more immiscible liquids in which one of the liquids is dispersed in the other liquid in the form of either globules or droplets. The emulsion is only a photosensitive covering on the film base, which is often made of silver halides (salts) that are suspended on a gelatin base. Gelatin is good for the base because it keeps the grains of silver halides in a stable position that lets the processing agents penetrate quickly without harming the gelatin's strength. Silver halide is a combination of silver bromide and silver iodide where increasing the amount of silver iodide in the emulsion increases the film's sensitivity to light. The silver halides are in crystal form in the x-ray film's emulsion.
Films used for x-rays need to have a spectral sensitivity which is matched to the emission spectrum of the intensifying screen. The standard silver halide film is sensitive up to a wavelength of 520 nm of light while being almost insensitive to most of the light that is emitted from a gadolinium oxisulfide sceen of 540 nm. When dealing with this screen, another type of negative should be used that is called ortho film. Ortho film is sensitive to the green light emitted from the screen through a sensitizing dying agent that is in the emulsion. The agent enables the emulsion to absorb green light and transfer its energy to the silver halide grains.
Originally, photographic glass plates were used for the base, but when the glass used for the plates from Belgium were cut off during World War I, a new base had to be created. Cellulose nitrate, which was already being used as a base for photography, was discovered to be a suitable subsistute. In 1924, a cellulose triacetate base was developed that was able to avoid the highly flammable nature of the cellulose nitrate. It wasn't until 1960 that a stronger, thinner, more stable base was developed. This new base was made of polyester.
|X-Ray Film Cross Reference Chart|
|Full-Speed Blue||Green||Green Lattitude||Duplicating|
|Mackie XRB||Mackie XRO||Mackie XROL||Mackie XR-DUP|
|Kodak RP, Kodak DF-75, Kodak DF-76||Kodak T-MAT-G, Kodak Ektavision G||Kodak T-MAT-L, Kodak Ektavision L||Kodak X-OMAT DUP|
|AGFA Radiomat-B||AGFA Radiomat-SG||AGFA Radiomat-GL||AGFA Radiomat Duplicating, AGFA Radiomat-DUP|
x-ray film discount dental supplies Mackie xray dentists supply