Paola's Film Project



Developing Film

To develop film is a multi-step process. There are three important parts of a radiographic film (radiographic is the x-ray of film) which is the Base, Emulsion, & Protective Coating.

Base: The purpose of the base is for the materials to be applied to. It is usually made of flexible plastic and provides support for the emulsion. It is not senstive nor can it record image. The transperancy of the film is very important because the film is capable of transmitting light.

Emulsion: The purpose of the emulsion is that is has a senstive suspension material that forms the image. It is manufactured in a pale yellow color with a glassy look.

Protective Coating: The purpose is to protect the softer layers on the film from scratches when handling.

After the film has been exposed to an image, it has to go through a chemical development. The purpose of the development is so you can see the image clearly and be stored.

1. To begin the process, you use chemicals of alkali, metol or hydroquinone mixed with water. It will expose the silver bromide (crystals in the emulsion layer that upon exposure will create the latent image) to black metallic oxide. This will make the image visible.

2. The next in the process is the stop bath. This bath is made up of glacial acetic acid and water to neutralize any extra silver crystals.

3.The third step is the fixer. Its purpose to permantly fix the image on the film so it could be perserved over time. You have to remove any unexposed crystals and harden the remaing ones.

4. Lastly, the film is rinsed and dried.

Resources:

http://www.ndt-ed.org/EducationResources/CommunityCollege/Radiography/EquipmentMaterials/radiographicfilm.htm

http://www.ndt-ed.org/EducationResources/HighSchool/Radiography/developingfilm.htm

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