1.1 本指南涵盖以下内容的确定: 232 α光谱法测定六氟化铀中的铀。 1.2 以国际单位制表示的数值应视为标准值，除非非国际单位制摩尔M用于化学品和试剂的浓度。电子伏特（eV）的单位不在国际单位制范围内，但国际度量衡委员会（CIPM，ComitéInternational des Poids et Mesures）和美国国家科学技术研究所（NIST）接受其与国际单位制的结合使用。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 本指南适用于材料分析，以证明符合规范中规定的规范 C787 和 C996 . 其他一些规格可以用质量表示 232 U/质量 238 U（见ISO 21847-3-2007）。

1.1 This guide covers the determination of 232 U in uranium hexafluoride by alpha spectrometry. 1.2 The values stated in SI units are to be regarded as standard, except where the non-SI unit of molar, M, is used for the concentration of chemicals and reagents. The unit of electronvolt (eV) is outside the SI but its use with the SI is accepted by the International Committee for Weights and Measures (CIPM, Comité International des Poids et Mesures) and the U. S. National Institute of Science and Technology (NIST). 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 guide is applicable to the analysis of materials to demonstrate compliance with the specifications set forth in Specifications C787 and C996 . Some other specifications may be expressed in terms of mass of 232 U per mass of only 238 U (see ISO 21847–3:2007).