Significance and Use
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 9 describes specific parameters used for this test method. In general, the classification for hard X-rays, as described in Section 9, can be transferred to other radiation energies and metallic screen types, as well as screens without films. The usage of film system parameters outside the energy ranges specified may result in changes to a film/system performance classification.
The film performance is described by contrast and noise parameters. The contrast is represented by gradient and the noise by granularity.
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 σD at D = 2.0, and gradient/noise ratio at D – D0 = 2.0.
This test method describes how the parameters shall be measured and demonstrates how a classification table can be constructed.
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 Table 2. Another table also includes speed data for user information. Users of industrial radiographic film systems may also perform the tests and measurements outlined in this test method, provided that the required test equipment is used and the methodology is followed strictly.
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 8.
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.
Note 1—ASTM research report E07–1005 contains documentation of technical methods used during the development of this test method.
1.1 This test method covers a procedure for determination of the performance of film systems used for industrial radiography. This test method establishes minimum requirements that correspond to system classes.
1.2 This test method is to be used only for direct exposure-type film exposed with lead intensifying screens. The performance of films exposed with fluorescent (light-emitting) intensifying screens cannot be determined accurately by this test method.
1.3 The values stated in SI units are to be regarded as standard. The values given in parentheses are for information only.
1.4 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.
2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.
E94 Guide for Radiographic Examination
E1316 Terminology for Nondestructive Examinations
ISO/IEC 17025 General Requirements for the Competence of Testing and Calibration Laboratories
European CEN Standard
EN 584-1 Non-Destructive Testing--Industrial Radiographic Film--Part 1: Classification of Film Systems for Industrial Radiography
ASTM system class; film system; film system classification; gradient; gradient/noise; granularity; industrial radiographic film; speed; Classification (standards); Film systems; Industrial radiographic film processing/testing; Radiographic examination;
ICS Number Code 19.100 (Non-destructive testing); 77.040.20 (Non-destructive testing of metals)
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Citing ASTM Standards
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