1.1 本规程涵盖了用于确定胶片射线照片或CR成像板、数字探测器阵列或放射系统拍摄的数字图像的图像不清晰度和基本空间分辨率的量规的设计和基本使用。 1.2 本规程适用于利用X射线和γ射线辐射源的射线照相和射线透视成像系统。 1.3 单位- 以国际单位制表示的数值应视为标准值。本标准不包括其他计量单位。 1.4 所述仪表可在管电压高达600 kV的情况下有效使用。 1.5 当在兆伏范围内使用电源电压时，结果可能并不完全令人满意。该仪表可用于MV范围，最好用于无物体探测器的表征。 1.6 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。 1.7 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====== 5.1 该仪表旨在提供一种测量图像或探测器不清晰度和图像或探测器基本空间分辨率的方法，尽可能独立于成像系统和对比度灵敏度限制。当双规直接定位在胶片或数字探测器上而不是测试对象上时，则确定的不清晰度对应于固有胶片或探测器的不清晰度( U 探测器 )所确定的基本空间分辨率对应于基本空间检测器分辨率 SR公司 b 探测器 . 注1: ISO 19232-5中描述的量规在尺寸和评估程序方面与本标准相当。 5.2 申请依据 5.2.1 以下项目受使用或参考本惯例的双方之间的合同协议约束。 5.2.1.1 人员资格- 按照本规程进行检查的人员应符合NAS410、EN 4179、ANSI/ASNT CP 189、ISO 9712或SNT-TC-1A的要求，并由业主或认证机构（如适用）认证。当合同或采购订单中有规定时，可使用其他同等资格文件。除非双方之间的合同协议中另有规定，否则适用版本应为最新版本。 5.2.1.2 如果合同协议中有规定，无损检测机构应按照规范中的规定进行资格鉴定和评估 E543 . 规范的适用版本 E543 应在合同中规定。

1.1 This practice covers the design and basic use of a gauge used to determine the image unsharpness and the basic spatial resolution of film radiographs or of digital images taken with CR imaging plates, digital detector arrays, or radioscopic systems. 1.2 This practice is applicable to radiographic and radioscopic imaging systems utilizing X-ray and gamma ray radiation sources. 1.3 Units— The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard. 1.4 The gauge described can be used effectively with tube voltages up to 600 kV. 1.5 When using source voltages in the megavolt range, the results may not be completely satisfactory. The gauge may be used in the MV range, preferably for characterization of detectors without object. 1.6 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. 1.7 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 gauge is intended to provide a means for measuring image or detector unsharpness and basic spatial resolution of the image or detector as independently as practicable from the imaging system and contrast sensitivity limitations. When the duplex gauge is positioned directly on the film or the digital detector and not on the test object, then the determined unsharpness corresponds to the inherent film or detector unsharpness ( U detector ) and the determined basic spatial resolution corresponds to the basic spatial detector resolution SR b detector . Note 1: The gauge, described in ISO 19232-5, is equivalent to this standard in the dimensions and the evaluation procedure. 5.2 Basis of Application 5.2.1 The following items are subject to contractual agreement between the parties using or referencing this practice. 5.2.1.1 Personnel Qualification— Personnel performing examinations to this practice shall be qualified in accordance with NAS410, EN 4179, ANSI/ASNT CP 189, ISO 9712, or SNT-TC-1A and certified by the employer or certifying agency as applicable. Other equivalent qualification documents may be used when specified on the contract or purchase order. The applicable revision shall be the latest unless otherwise specified in the contractual agreement between parties. 5.2.1.2 If specified in the contractual agreement, NDT agencies shall be qualified and evaluated as described in Specification E543 . The applicable edition of Specification E543 shall be specified in the contract.