1、Designation: E2698 10Standard Practice forRadiological Examination Using Digital Detector Arrays1This standard is issued under the fixed designation E2698; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the year of last revision.
2、A number in parentheses indicates the year of last reapproval. Asuperscript epsilon () indicates an editorial change since the last revision or reapproval.1. Scope1.1 This practice establishes the minimum requirements forradiological examination for metallic and nonmetallic materialusing a digital d
3、etector array (DDA) system.1.2 The requirements in this practice are intended to controlthe quality of radiologic images and are not intended toestablish acceptance criteria for parts or materials.1.3 This practice covers the radiologic examination withDDAs including DDAs described in Practice E2597
4、 such as adevice that contains a photoconductor attached to a Thin FilmTransistor (TFT) read out structure, a device that has aphosphor coupled directly to an amorphous silicon read-outstructure, and devices where a phosphor is coupled to a CMOS(Complementary metaloxidesemiconductor) array, a Linear
5、Detector Array (LDA) or a CCD (charge coupled device)crystalline silicon read-out structure.1.4 The DDA shall be selected for an NDT applicationbased on knowledge of the technology described in GuideE2736, and of the selected DDA properties provided by themanufacturer in accordance with Practice E25
6、97.1.5 The requirements of this practice and Practice E2737shall be used together and both be approved by the CEO Level3 in Radiography before inspection of production hardware.The requirements of Practice E2737 will provide the baselineevaluation and long term stability test procedures for the DDAs
7、ystem.1.6 The requirements in this practice shall be used whenplacing a DDA into NDT service and, before being placed intoservice, an established baseline of system qualification shall beperformed in accordance with Practice E2737.1.7 Techniques and applications employed with DDAs arediverse. This p
8、ractice is not intended to be limiting or restric-tive. Refer to Guides E94, E1000, E2736, Terminology E1316,Practice E747 and E1025, Fed. Std. Nos. 21CFR 1020.40 and29 CFR 1910.96 for a list of documents that provide additionalinformation and guidance.2. Referenced Documents2.1 ASTM Standards:2E94
9、Guide for Radiographic ExaminationE543 Specification for Agencies Performing Nondestruc-tive TestingE747 Practice for Design, Manufacture and MaterialGrouping Classification of Wire Image Quality Indicators(IQI) Used for RadiologyE1000 Guide for RadioscopyE1025 Practice for Design, Manufacture, and
10、MaterialGrouping Classification of Hole-Type Image Quality Indi-cators (IQI) Used for RadiologyE1316 Terminology for Nondestructive ExaminationsE1647 Practice for Determining Contrast Sensitivity inRadiologyE1742 Practice for Radiographic ExaminationE2002 Practice for Determining Total Image Unsharp
11、nessin RadiologyE2597 Practice for Manufacturing Characterization of Digi-tal Detector ArraysE2736 Guide for Digital Detector ArraysE2737 Practice for Digital Detector Array PerformanceEvaluation and Long-Term Stability2.2 AWS Documents:3AWS A2.4 Symbols for Welding and Nondestructive Test-ing2.3 Ae
12、rospace Industries Association Document:4NAS 410 Certification amorphous silicon; digital detec-tor array; image processing; image quality indicator; nonde-structive testing; penetrating radiation; radiography; radiologicexamination; X-rayAPPENDIXX1. MINIMUM PERIODIC PERFORMANCE EVALUATIONSReference
13、 qualification std Paragraph Reference Frequency (minimum)Light Meter Must be calibrated Every 6 monthsImage Display EvaluationImage Brightness 7.5.1 Once per monthMonitor 7.5.2-7.5.7 Dailybad pixel, gain and offset maps 8.4-8.5 In accordance with manufacturers recommendations or CEOIQI Evaluation f
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