ASTM E1815-08(2013)e1

4.1 This test method provides a relative means for classification of film systems used for industrial radiography. The film system consists of the film and associated processing system (the type of processing and processing chemistry). Section 4.1.1 The film performance is described by contrast and noise parameters. The contrast is represented by gradient and the noise by granularity.

4.1.2 A film system is assigned a particular class if it meets the minimum performance parameters: for Gradient G at D – D₀ = 2.0 and D – D₀ = 4.0, and gradient/noise ratio at D – D₀ = 2.0, and the maximum performance parameter: granularity σ_D at D = 2.0.

4.2 This test method describes how the parameters shall be measured and demonstrates how a classification table can be constructed.

4.3 Manufacturers of industrial radiographic film systems and developer chemistry will be the users of this test method. The result is a classification table as shown by the example given in 4.4 The publication of classes for industrial radiography film systems will enable specifying bodies and contracting parties to agree to particular system classes, which are capable of providing known image qualities. See 4.5 ISO 11699–1 and European standard EN 584-1 describe the same method for classification of film systems for industrial radiography, but its class definitions and number of classes do not align exactly with this test method. International users of these standards should be aware of these differences for their particular applications.