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What influcences the speed of film in radiography?



In radiography the relationship between exposure (in C/kg) and resulting density is com- monly referred to as film speed. Other than in normal photography where film speed is indicated by a DIN or ASA number, films for industrial radiography do not carry an inter- nationally recognised speed number.

The generally accepted method of measuring the film speed of radiographic films is to mea- sure the exposure required to achieve a density of 2.0 above base and fog, using a specific processing technique. The various relative exposure values are shown in table 1-8.

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Listing of various Agfa films