ASTM E1815 Classification of Film Systems for Industrial Radiography

ASTM E1815 Classification of Film Systems for Industrial Radiography

The approach for determining the performance of film systems used in industrial radiography is covered by the standard test method ASTM E1815. This type of testing defines basic standards for system classes. The values are considered as a standard when expressed in SI units.

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    Scope:

    ASTM E1815 test method gives a relative means of classifying industrial radiography film systems. The film system consists of the film and the processing system that goes with it. Only direct exposure-type film exposed with lead enhancing screens should be tested using this procedure. This test method cannot accurately measure the performance of films exposed to fluorescent (light-emitting) intensifying screens.

    Procedure:

    In ASTM E1815, the measurement equipment is used for classification if this equipment and the corresponding test procedures produce the same results with an uncertainty of less than 5% and a confidence level of 95% for gradient G2, less than 7%, and a confidence level of 95% for gradient G4, and less than 10% and a confidence level of 95% for granularity. Compared to the test method of 7.1 to 7.4 for the film systems to be categorized, this shall conform with ISO/IEC 17025.

    Specimen size

    The microdensitometer’s inflow aperture must be roughly circular, with a diameter of not less than 1.2 times or more than 2 times the diameter of the efflux aperture.

    Data
    G = dD /d log10 K

    where:

    K is the dose required for density D − Do, and Do is the fog and base density.

    Conclusion:

    ASTM E1815 test method gives a relative means of classifying industrial radiography film systems.

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