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Standard Test Method for Classification of Film Systems for Industrial Radiography (Includes all amendments And changes 11/28/2018).
Automaticky přeložený název:
Standardní zkušební metoda pro klasifikaci filmových systémů pro účely průmyslové radiografie
NORMA vydána dne 1.6.2013
Označení normy: ASTM E1815-08(2013)e1
Poznámka: NEPLATNÁ
Datum vydání normy: 1.6.2013
Kód zboží: NS-43147
Počet stran: 7
Přibližná hmotnost: 21 g (0.05 liber)
Země: Americká technická norma
Kategorie: Technické normy ASTM
Keywords:
ASTM system class, film system, film system classification, gradient, gradient/noise, granularity, industrial radiographic film, speed, ICS Number Code 19.100 (Non-destructive testing), 77.040.20 (Non-destructive testing of metals)
Significance and Use | ||||
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 σD 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. 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. |
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2. Referenced Documents | ||||
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