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Significance and Use
4.1 This standard provides a guide for the other DDA standards (see Practices , , and ). It is not intended for use with computed radiography apparatus. Figure 1 describes how this standard is interrelated with the aforementioned standards.
FIG. 1 Flow Diagram Representing the Connection Between the Four DDA Standards
4.2 This guide is intended to assist the user to understand the definitions and corresponding performance parameters used in related standards as stated in in order to make an informed decision on how a given DDA can be used in the target application.
4.3 This guide is also intended to assist cognizant engineering officers, prime manufacturers, and the general service and manufacturing customer base that may rely on DDAs to provide advanced radiological results so that these parties may set their own acceptance criteria for use of these DDAs by suppliers and shops to verify that their parts and structures are of sound integrity to enter into service.
4.4 The manufacturer characterization standard for DDA (see Practice ) serves as a starting point for the end user to select a DDA for the specific application at hand. DDA manufacturers and system integrators will provide DDA performance data using standardized geometry, X-ray beam spectra, and phantoms as prescribed in Practice . The end user will look at these performance results and compare DDA metrics from various manufacturers and will decide on a DDA that can meet the specification required for inspection by the end user. See Sections and for a discussion on the characterization tests and guidelines for selection of DDAs for specific applications.
4.5 Practice is designed to assist the end user to set up the DDA with minimum requirements for radiological examinations. This standard will also help the user to get the required SNR, to set up the required magnification, and provides guidance for viewing and storage of radiographs. Discussion is also added to help the user with marking and identification of parts during radiological examinations.
4.6 Practice is designed to help the end user with a set of tests so that the stability of the performance of the DDA can be confirmed. Additional guidance is provided in this document to support this standard.
4.7 Figure 1 provides a summary of the interconnectivity of these four DDA standards.
4.8 DDAs may be used with significant success under a wide energy range, i.e. from 10 kV to 20 MeV if configured appropriately. However in this document some phantoms such as the duplex wire gauge (Practice ) may not give an accurate representation of the basic spatial resolution at energies above 600 kV.
1.1 This standard is a user guide, which is intended to serve as a tutorial for selection and use of various digital detector array systems nominally composed of the detector array and an imaging system to perform digital radiography. This guide also serves as an in-detail reference for the following standards: Practices , , and .
1.2 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, health, and environmental practices and determine the applicability of regulatory limitations prior to use.
1.3 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
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 Using Industrial Radiographic Film
E155 Reference Radiographs for Inspection of Aluminum and Magnesium Castings
E192 Reference Radiographs of Investment Steel Castings for Aerospace Applications
E1000 Guide for Radioscopy
E1316 Terminology for Nondestructive Examinations
E1320 Reference Radiographs for Titanium Castings
E1815 Test Method for Classification of Film Systems for Industrial Radiography
E1817 Practice for Controlling Quality of Radiological Examination by Using Representative Quality Indicators (RQIs)
E2002 Practice for Determining Total Image Unsharpness and Basic Spatial Resolution in Radiography and Radioscopy
E2422 Digital Reference Images for Inspection of Aluminum Castings
E2445 Practice for Performance Evaluation and Long-Term Stability of Computed Radiography Systems
E2446 Practice for Manufacturing Characterization of Computed Radiography Systems
E2597 Practice for Manufacturing Characterization of Digital Detector Arrays
E2660 Digital Reference Images for Investment Steel Castings for Aerospace Applications
E2669 Digital Reference Images for Titanium Castings
E2698 Practice for Radiological Examination Using Digital Detector Arrays
E2737 Practice for Digital Detector Array Performance Evaluation and Long-Term Stability
ISO DocumentISO 17636-2 Non-Destructive Testing of WeldsRadiographic Testing - Part 2: X- and Gamma-Ray Techniques with Digital Detector
ICS Number Code 11.040.50 (Radiographic equipment)
UNSPSC Code 41111800(Non destructive examination equipment)
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ASTM E2736-17, Standard Guide for Digital Detector Array Radiography, ASTM International, West Conshohocken, PA, 2017, www.astm.orgBack to Top