1.1 灰铸铁件的这些参考射线照片包括一组严重程度为1至5级的中心线收缩插图，使用三种辐射源类型，如下所示: 1.1.1 第一卷:中压（标称250 kVp）X射线参考射线照片- 15 x 17中的5个严重性级别集 在里面文件夹 1.1.2 第二卷:铱-192参考射线照片- 15 x 17英寸中的5个严重性级别集。文件夹 1.1.3 第三卷:钴-60参考射线照片- 15 x 17英寸中的5个严重性级别集。文件夹 注1: 参考射线底片是本文件的附件，如有必要，必须从ASTM International单独购买。 1.2 有时，参考射线照片辅助材料的制造工艺可能会有微小变化。 这些变化可能包括所用薄膜或加工化学品的变化、硬纸板垫模具或印刷的变化等。；然而，在所有情况下，这些变化均由插图监测小组委员会审查，并根据固定原型图像审查所有参考射线照片，以确保参考射线照片所代表的验收水平没有变化。因此，无论文本标准的生产日期或修订水平如何，附加参考射线照片均适用于本标准。 1.3 单位- 以英寸-磅为单位的数值应视为标准值。括号中给出的值是到国际单位制的数学转换，仅供参考，不被视为标准值。 1.4 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。 1.5 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 人员资格- 根据本标准使用参考射线照片的人员应符合国家或国际公认的无损检测人员资格认证惯例或标准，并经业主或认证机构认证（如适用）。使用的惯例或标准及其适用版本应在使用方之间的合同协议中确定。业主应授权人员进行射线照相解释。应提供经认证的三级人员，以协助解释适用于参考射线照片的规范和产品要求（如果三级人员是射线照相口译员，则可能是同一个人）。 4.2 这些参考射线照片以及参考的适用钢铸件标准（参考射线照片 E186 和 E446 )，作为确定接受射线照相检查的灰铸铁件中常见内部不连续类型的类别和严重程度的手段。可根据买方和供应商之间约定的合同规范使用。 4.3 本标准的使用不限于本标准标题中包含的特定能量水平或绝对厚度限制。标题旨在描述而非限制性。在没有其他适用文件的情况下，本文件可用于其他能级或厚度，或两者兼有，且买方和供应商已就此达成协议。

1.1 These reference radiographs for gray iron castings consist of one set of illustrations of centerline shrinkage with severity levels 1 to 5 using three radiation source types as follows: 1.1.1 Volume I: Medium Voltage (Nominal 250 kVp) X-ray Reference Radiographs— Set of 5 severity levels in a 15 by 17 in. folder. 1.1.2 Volume II: Iridium-192 Reference Radiographs— Set of 5 severity levels in a 15 by 17 in. folder. 1.1.3 Volume III: Cobalt-60 Reference Radiographs— Set of 5 severity levels in a 15 by 17 in. folder. Note 1: The reference radiograph films are an adjunct to this document and must be purchased separately from ASTM International if needed. 1.2 From time to time, there may be minor changes to the process for manufacturing of the reference radiograph adjunct materials. These changes could include changes in the films or processing chemicals used, changes in the dies or printing for the cardboard mats, etc.; however, in all cases, these changes are reviewed by the Illustration Monitoring Subcommittee and all reference radiographs are reviewed against a fixed prototype image to ensure that there are no changes to the acceptance level represented by the reference radiographs. Therefore, the adjunct reference radiographs remain valid for use with this standard regardless of the date of production or the revision level of the text standard. 1.3 Units— The values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered standard. 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, health, and environmental practices and determine the applicability of regulatory limitations prior to use. 1.5 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 Personnel Qualification— Personnel utilizing reference radiographs to this standard shall be qualified to perform radiographic interpretation in accordance with a nationally or internationally recognized NDT personnel qualification practice or standard and certified by the employer or certifying agency, as applicable. The practice or standard used and its applicable revision shall be identified in the contractual agreement between the using parties. Personnel shall be authorized to perform radiographic interpretation by the employer. A certified Level III shall be available to assist with interpreting specifications and product requirements as applied to the reference radiographs (if the Level III is the radiographic interpreter, this may be the same person). 4.2 These reference radiographs, along with the referenced applicable steel casting standards (Reference Radiographs E186 and E446 ), are supplied as a means of establishing categories and severity levels of common internal discontinuity types in gray iron castings subjected to radiographic examination. They may be used in accordance with contractual specifications as agreed upon between purchaser and supplier. 4.3 The use of this standard is not intended to be restricted to the specific energy level or to the absolute thickness limits that are contained in this standard title. The title is intended to be descriptive and not restrictive. This document may be used, where there is no other applicable document, for other energy levels or thicknesses, or both, for which it is found to be applicable and for which agreement has been reached between purchaser and supplier.