1.1 本试验方法适用于六氟化铀（UF）的同位素分析 6. )与 235 U浓度小于或等于5 % 和 234 U 236 0.0002至0.1的U浓度 %. 1.2 此测试方法可适用于分析 235 U同位素组成，提供足够的认证参考材料（CRM或可追溯标准）。 1.3 本标准并非旨在解决与其使用相关的所有安全问题（如有）。本标准的使用者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。 1.4 本国际标准是根据世界贸易组织技术性贸易壁垒委员会发布的《关于制定国际标准、指南和建议的原则的决定》中确立的国际公认的标准化原则制定的。 ====意义和用途====== 5.1 六氟化铀是用于生产核反应堆燃料的基本材料。为了适用于此目的，材料必须符合同位素组成的标准。该试验方法旨在确定材料是否符合规范中所述的要求 C787型 和 C996年 。

1.1 This test method is applicable to the isotopic analysis of uranium hexafluoride (UF 6 ) with 235 U concentrations less than or equal to 5 % and 234 U, 236 U concentrations of 0.0002 to 0.1 %. 1.2 This test method may be applicable to the analysis of the entire range of 235 U isotopic compositions providing that adequate Certified Reference Materials (CRMs or traceable standards) are available. 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 Uranium hexafluoride is a basic material used to produce nuclear reactor fuel. To be suitable for this purpose, the material must meet criteria for isotopic composition. This test method is designed to determine whether the material meets the requirements described in Specifications C787 and C996 .