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When an x-ray beam reaches the patient, it contains no information regading the patient body or tissue or organ etc. After passing through and having interaction with the tissues in the body of patient, it contain that information which a radiographer wants to know about. On this stage we are unable to get any viw from it unless until we transfer that information to suitable medium of veiwing by human eye. In normal practice, the most common method use to decode this information in attenuated x-ray beam is a ' photographic film'. This process involves, the energy of x-ray beam is converted into light by intensifying screens and this light is then used to expose the films.
Radiographic Films:
The x-ray film is photographic film consisting of a photographically active, or radiation sensitive emulsion that is coated on both sides of a transparent sheet of plastic which is called base sheet or simply base. A thin layer of adhesive material is used to make a good contact between film base and emulsion. Again some supercoating layers are used to protect the mechanical damage of emulsion which is delicate. The purpose of film base is to support the fragile photographic emulsion. The important characteristics of the film base are as follows:
- It must not produce a visible pattern or absorb too much light when the radiograph is viewed.
- The flexibility, thickness and strength of the base must allow for ease of processing or developing.
- The base must have dimensional stability, the shape and size of the base must not change during the developing process or during storing.
Original x-ray plates are consisted of a glass plate with the emulsion coated on one side. The two most important ingredients of a photographic emulsion are gelatin and silver halid. Emulsion thickness varies with film type which in not thicker than 0.5 mil.
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