1.1 本规程涵盖灵敏度指示器（SI）的制造，可用于确定直接热中子射线照相检查产生的胶片射线照相图像的相对质量。 1.2 单位- 以英寸-磅单位表示的值应视为标准值。 1.3 本标准并不旨在解决与其使用相关的所有安全问题（如有）。本标准的使用者有责任在使用前建立适当的安全、健康和环境实践，并确定监管限制的适用性。 1.4 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《国际标准、指南和建议制定原则决定》中确立的国际公认标准化原则制定的。 =====意义和用途====== 5.1 唯一真正有效的图像质量指示器是材料或部件，相当于中子射线照相的部件，具有已知的标准不连续性、夹杂物、遗漏或缺陷（参考标准对比部件）。 SI旨在替代参考标准，在单个单位中提供孔和间隙灵敏度的定性信息。按照本规程进行制造对于准确和一致的测量至关重要。 5.2 本规程应适用于与试验方法一起使用的所有SI的制造 E545号 以确定直接热中子照相术中的图像质量。根据本规程先前版本或试验方法制造的装置 E545号 对于1981年至1991年间制造的设备。

1.1 This practice covers the fabrication of Sensitivity Indicators (SI), which can be used to determine the relative quality of film radiographic images produced by direct, thermal neutron radiographic examination. 1.2 Units— The values stated in inch-pound units are to be regarded as standard. 1.3 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. 1.4 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 ====== 5.1 The only truly valid image quality indicator is a material or component, equivalent to the part being neutron radiographed, with a known standard discontinuity, inclusion, omission, or flaw (reference standard comparison part). The SI is designed to substitute for the reference standard, providing qualitative information on hole and gap sensitivity in a single unit. Fabrication in accordance with this practice is vital for accurate and consistent measurements. 5.2 This practice shall be followed for the fabrication of all SIs to be used with Test Method E545 to determine image quality in direct thermal neutron radiography. Devices constructed to previous versions of this practice, or Test Method E545 for devices built between 1981 and 1991, can also be used.