1.1 目的- 本文概述了使用热中子对材料和部件进行射线照相检查的做法。它们旨在作为生产具有一致质量特征的中子射线照片的指南，并帮助用户考虑热中子放射学的适用性。提供了有关首选做法的声明，但未讨论首选做法的技术背景。必要的技术背景见参考文献 ( 1- 16 ) . 2. 1.2 限制- 尚未为任何材料或生产过程制定验收标准（见第节） 5. 基于应用）。然而，遵守指南将产生可重复的结果。无论是通过反应堆、加速器、亚临界组件或放射源进行的中子照相术，只有在保持技术所有细节（如中子源、准直、几何形状、胶片等）的一致性的情况下，其灵敏度和分辨率才会保持一致。 本指南仅限于结合转换屏幕使用照相或射线照相胶片进行图像记录；其他成像系统可用。重点放在核反应堆中子源的使用上。 1.3 解释和验收标准- 本指南不包括解释和验收标准。验收和拒收标准的指定在产品规范的认定范围内。 1.4 安全实践- 中子放射学过程特有的中子和伴生辐射防护的一般做法在第节中讨论 18 . 管辖核法规也将适用。 1.5 中子射线照相过程的其他方面- 有关中子射线照相的许多重要方面，如技术、文件、射线照片的查看、射线照片的存储、胶片处理和记录保存，请参阅指南 E94 ，其中涵盖了X射线照相的这些方面。（参见第节 2. .) 1.6 以国际单位制或英寸-磅单位表示的数值应视为标准。 1.7 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。 1.8 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 本指南涵盖待检查材料的类型、中子射线照相检查技术、中子产生和准直方法、射线照相胶片和转换器屏幕选择。在中子放射学技术的当前状态下，这些实践通常适用于特定的材料组合、工艺和技术。

1.1 Purpose— Practices to be employed for the radiographic examination of materials and components with thermal neutrons are outlined herein. They are intended as a guide for the production of neutron radiographs that possess consistent quality characteristics, as well as aiding the user to consider the applicability of thermal neutron radiology. Statements concerning preferred practice are provided without a discussion of the technical background for the preference. The necessary technical background can be found in Refs ( 1- 16 ) . 2 1.2 Limitations— Acceptance standards have not been established for any material or production process (see Section 5 on Basis of Application). Adherence to the guide will, however, produce reproducible results. Neutron radiography, whether performed by means of a reactor, an accelerator, subcritical assembly, or radioactive source, will be consistent in sensitivity and resolution only if the consistency of all details of the technique, such as neutron source, collimation, geometry, film, etc., are maintained. This guide is limited to the use of photographic or radiographic film in combination with conversion screens for image recording; other imaging systems are available. Emphasis is placed on the use of nuclear reactor neutron sources. 1.3 Interpretation and Acceptance Standards— Interpretation and acceptance standards are not covered by this guide. Designation of accept-reject standards is recognized to be within the cognizance of product specifications. 1.4 Safety Practices— General practices for personnel protection against neutron and associated radiation peculiar to the neutron radiologic process are discussed in Section 18 . Jurisdictional nuclear regulations will also apply. 1.5 Other Aspects of the Neutron Radiographic Process— For many important aspects of neutron radiography such as technique, files, viewing of radiographs, storage of radiographs, film processing, and record keeping, refer to Guide E94 , which covers these aspects for X-ray radiography. (See Section 2 .) 1.6 The values stated in either SI or inch-pound units are to be regarded as the standard. 1.7 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. 1.8 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 This guide covers types of materials to be examined, neutron radiographic examination techniques, neutron production and collimation methods, radiographic film, and converter screen selection. Within the present state of the neutron radiologic art, these practices are generally applicable to specific material combinations, processes, and techniques.