ASTM E2023-19 pdf free download 中子射线敏感性指示器的制作标准

ASTM E2023-19 pdf free download,Standard Practice for Fabrication of Neutron Radiographic Sensitivity Indicators.
中子射线敏感性指示器的制作标准

Scope

1.1 ASTM E2023-19 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 ASTM E2023-19 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 ASTM E2023-19 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.

范围

1.1 本实施规程涵盖了敏感性指示器（SI）的制作，可用于确定由直接热中子射线检查产生的胶片射线图像的相对质量。

1.2 单位—以英制单位表示的值应视为标准。

1.3 本标准不旨在涵盖与其使用相关的所有安全问题（如果有）。使用本标准的用户有责任在使用前建立适当的安全、健康和环境规范，并确定法规限制的适用性。

1.4 本国际标准是根据世界贸易组织技术性贸易壁垒（TBT）委员会发布的有关国际标准、指南和建议制定原则的决定制定的。

意义与用途

5.1 唯一真正有效的图像质量指示器是一种材料或部件，等效于被中子射线检查的零件，具有已知标准的不连续性、夹杂物、漏项或缺陷（参比标准对照件）。敏感性指示器设计用于替代参比标准，提供关于孔隙和间隙灵敏度的定性信息。按照本标准进行制作对于准确和一致的测量至关重要。

5.2 所有敏感性指示器的制作都应遵循本标准，以用于测试方法E545中的直接热中子射线成像来确定图像质量。也可以使用根据本标准早期版本或1981年至1991年之间构建的设备进行的测试方法E545。