1.1 这种做法 2. 提供了使用射线照相胶片作为记录介质对金属铸件进行射线照相检查的统一程序。 1.2 本标准阐述了铸件射线照相覆盖的通用或实用水平的实现或协议，以检测由指定图像质量指示器测量的灵敏度水平的主要体积不连续性。所有偏差，包括增加覆盖范围的替代方式或方法，或解决检测非体积平面型不连续性的挑战，应在买方和供应商之间达成一致，并应考虑 附录X1 和 附录X2 . 1.3 本文所述的射线照相技术为缺陷检测能力提供了充分的保证； 然而，人们认识到，对于特殊应用，可能需要使用比规定要求更严格或更不严格的特定技术。在这些情况下，替代射线照相技术的使用应经买方和供应商同意（另见第节） 5. ). 1.4 单位- 以国际单位制或英寸-磅单位表示的数值应单独视为标准值。每个系统中规定的值不一定是精确的等价物；因此，为确保符合本标准，每个系统应独立使用，且两个系统的值不得组合。 1.5 本标准并非旨在解决与其使用相关的所有安全问题（如有）。 本标准的用户有责任在使用前制定适当的安全、健康和环境实践，并确定监管限制的适用性。 1.6 本国际标准是根据世界贸易组织技术性贸易壁垒（TBT）委员会发布的《关于制定国际标准、指南和建议的原则的决定》中确立的国际公认标准化原则制定的。 ====意义和用途====== 4.1 本实施规程中提出的要求旨在控制射线照相图像的质量，产生令人满意和一致的结果，而不是用于控制材料或产品的可接受性或质量。

1.1 This practice 2 provides a uniform procedure for radiographic examination of metallic castings using radiographic film as the recording medium. 1.2 This standard addresses the achievement of, or protocols for achieving, common or practical levels of radiographic coverage for castings, to detect primarily volumetric discontinuities to sensitivity levels measured by nominated image quality indicators. All departures, including alternate means or methods to increase coverage, or address challenges of detecting non-volumetric planar-type discontinuities, shall be agreed upon between the purchaser and supplier and shall consider Appendix X1 and Appendix X2 . 1.3 The radiographic techniques stated herein provide adequate assurance for defect detectability; however, it is recognized that, for special applications, specific techniques using more or less stringent requirements may be required than those specified. In these cases, the use of alternate radiographic techniques shall be as agreed upon between purchaser and supplier (also see Section 5 ). 1.4 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 are not necessarily exact equivalents; therefore, to ensure conformance with the standard, each system shall be used independently of the other, and values from the two systems shall not be combined. 1.5 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. 1.6 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. ====== Significance And Use ====== 4.1 The requirements expressed in this practice are intended to control the quality of the radiographic images, to produce satisfactory and consistent results, and are not intended for controlling the acceptability or quality of materials or products.