ASTM E1255 : 23

Standard Practice for Radioscopy

Standard Details

1.1 This practice2 covers application details for radioscopic examination using penetrating radiation using an analog component such as an electro-optic device (for example, X-ray image intensifier (XRII) or analog camera, or both) or a Digital Detector Array (DDA) used in dynamic mode radioscopy. Radioscopy is a radiographic technique that can be used in (1) dynamic mode radioscopy to track motion or optimize radiographic parameters in real-time, or both (25 to 30 frames per second), near real-time (a few frames per second), or high speed (hundreds to thousands of frames per second) or (2) static mode radioscopy where there is no motion of the object during exposure as a filmless recording medium. This practice is not to be used for static mode radioscopy using DDAs. If static radioscopy using a DDA (that is, DDA radiography) is being performed, use Practice E2698.

1.1.1 This practice also may be used for Linear Detector Array (LDA) applications where an LDA uses relative perpendicular motion of either the detector or component under examination to build an image line by line.

1.1.2 This practice may also be used for “flying spot” applications where a pencil beam of X-rays rasters over an area to build an image point by point.

1.2 This practice establishes the minimum requirements for radioscopic examination of metallic and non-metallic materials using X-ray or gamma radiation. Since the techniques involved and the applications for radioscopic examination are diverse, this practice is not intended to be limiting or restrictive, but rather to address the general applications of the technology and thereby facilitate its use. Refer to Guides E94 and E1000, and Terminology E1316, provide additional information and guidance.

1.3 Basis of Application:

1.3.1 The requirements of this practice and Practice E1411 shall be used together. The requirements of Practice E1411 will provide the performance qualification and long-term stability test procedures for the radioscopic system. The user of the radioscopic system shall establish a written procedure that addresses the specific requirements and tests to be used in their application and shall be approved by the Cognizant Radiographic Level 3 before examination of production hardware. There are areas (listed below 1.3.1.1 – 1.3.1.14) in this practice that may require agreement between the cognizant engineering organization and the radioscopy supplier, or specific direction from the cognizant engineering organization. These items should be addressed in the purchase order or the contract.

1.3.1.1 Systems, equipment, and materials that do not comply with this Practice (1.5);

1.3.1.2 Modified tests and/or gauges when using a gamma source or radiation energy above 320 kV (1.6);

1.3.1.3 Personnel qualification and certification (5.8);

1.3.1.4 Qualification of the NDT supplier (5.9);

1.3.1.5 Alternate image displays (6.1.3.1);

1.3.1.6 Alternate image quality indicator (IQI) types (6.1.6.5);

1.3.1.7 Non-requirement for IQI (8.9.7);

1.3.1.8 Examination record archiving, hard copy, and recording (6.1.10);

1.3.1.9 Radioscopic quality levels (8.8.1.16);

1.3.1.10 Total image unsharpness (8.8.1.15);

1.3.1.11 Performance verification (9.3);

1.3.1.12 Interpreter duty and rest periods (10.2);

1.3.1.13 Examination report (11.1);

1.3.1.14 Retention and storage of radiographs (6.1.10, 8.16, and 11.1);

1.3.2 Appendix X1 may be used to fulfill existing contracts that use Appendix X1 or the former Annex A1. The former mandatory Annex A1 “DEPARTMENT OF DEFENSE CONTRACTS, SUPPLEMENTAL REQUIREMENTS” was deleted and the detailed requirements are appended now in the non-mandatory Appendix X1.

1.4 This practice also requires the user to perform a technique qualification suitable for its intended purpose and to issue a system qualification report (see 9.7). Additionally, the user shall develop part specific inspection procedures (see Section 8).

1.5 Compliance—Systems, equipment, and materials that do not comply with this practice shall require approval from the Cognizant Engineering Organization (CEO).

1.6 The general principles discussed in this practice apply broadly to penetrating radiation radioscopic systems. However, this document is written specifically for use with X-ray and gamma-ray systems. Other radioscopic systems, such as those employing neutrons, will involve equipment and application details unique to such systems.

1.7 The user of this practice shall note that X-ray energies higher than 320 keV may require modified or different methods other than those described within this practice.

1.8 Units—The values stated in either SI units or inch-pound units are to be regarded separately as standard. The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other. Combining values from the two systems may result in non-conformance with the standard. Where applicable, SI units are shown in brackets [xx].

1.9 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. For specific safety statements, see Section 7.

1.10 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International StandardDetails, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.