1.1 本试验方法涵盖了以下物质的同位素丰度分析: 234 U 235 U 236 U、 和 238 水解六氟化铀（UF）样品中的铀 6. )通过电感耦合等离子体源、多采集器、质谱（ICP-MC-MS）。该方法适用于具有 235 U丰度在0.2到6之间 % 大量ASTM STP中也描述了该试验方法 1344 1.2 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。 1.3 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。 1.4 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《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 该测试方法能够测量 234 U 235 U 236 U、 和 238 U符合规范要求 C787 和 C996 .

1.1 This test method covers the isotopic abundance analysis of 234 U, 235 U, 236 U, and 238 U in samples of hydrolysed uranium hexafluoride (UF 6 ) by inductively coupled plasma source, multicollector, mass spectrometry (ICP-MC-MS). The method applies to material with 235 U abundance in the range of 0.2 to 6 % mass. This test method is also described in ASTM STP 1344. 1.2 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this 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 test method is capable of measuring uranium isotopic abundances of 234 U, 235 U, 236 U, and 238 U as required by Specifications C787 and C996 .