Radiographic Film

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Construction of the Radiographic Film
1.) Base
-          Supports the emulsion 150-300 mm thick, semi rigid lucent and made of polyester, the foundation of the Radiographic Film. Its primary purpose is to provide a rigid structure unto which the emulsion can be coated. It is flexible and fracture-resistant. It maintains the film shape and size during use and processing to limit extortion. It is flexible. It provides region structure.
Ø  Dye
-          Is added to tint the film blue to reduce eye strain.

Ø  Dimensional Stability
-          is the property of the base to maintain its size and shape.
Four Types of Base
1.) Glass Plate – the original film base
2.) Cellulose Nitrate – becomes a substitute of the glass plate and highly flammable.
3.) Cellulose Triacetate – not flammable and safety base
4.) Polyester – more resistant to warping from age and stronger and thinner than cellulose triacetate.
Ø  Emulsion – the heart and the most important part of the x-ray film. This is where the x-rays and light photons from IS interacting and transfer information. Consist of homogenous mixture of gelatin and silver halide crystals and coated evenly in 3-5 mm thick.
Ø  Gelatin – provides mechanical support for the silver halide crystals.
Ø  Silver Halide Crystals – the active ingredient of the emulsion. 98% of the crystal is Ag halide crystal and 2% is Ag iodide.
Atomic Number of the following:
Bromine = 35, Silver = 47, Iodine = 53, Gelatin and Base = 7
Ø  Contaminant – is the imperfection of the arrangement of crystals
3.) Adhesive Layer – a thin coating of material between the emulsion and base, it ensures the uniform adhesion between them. It allows the emulsion and base to maintain proper contact during use and processing.
4.) Overcoat Layer – the protective covering of the gelatin. It protects the emulsion from scratches, pressure, and contamination during handling, processing and storage. It also allows a rough manipulation of film before exposure.

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