1.1 这些试验方法涵盖或参考六氟化铀（UF）的二次采样和化学、质谱、光谱化学、核和放射化学分析程序 6. ). 大多数测试方法都是常规使用，以确定是否符合UF 6. 浓缩和转化设施的规范。 1.2 本文件中的分析程序按以下顺序出现: 注1: 小组委员会C26.05将就试验方法中重新编号的章节与C26.02进行协商 C761 当分析方法被独立的分析方法取代时，为了确定如何在后续出版物中最好地解决这些章节重新编号的问题。 小节 六氟化铀的二次采样 8. 铀的重量法测定 9 – 17 铀的滴定测定 18 高纯度铀的制备 3. O 8. 19 同位素分析 20 碳氢化合物、氯碳化合物和部分取代卤代烃的测定 21 – 27 锑的测定 28 溴的测定 29 氯的测定 30 – 36 硅和磷的测定 37 – 43 硼和硅的测定 44 钌的测定 45 钛和钒的测定 46 光谱法测定金属杂质 47 钨的测定 48 钍和稀土的测定 49 钼的测定 50 原子吸收法测定金属杂质 51 – 56 火花源质谱法测定杂质 57 硼当量中子截面的测定 58 热电离质谱法测定铀-233丰度 59 α光谱法测定铀-232 60 – 66 裂变产物活度的测定 67 用离子交换和α计数法测定钚 68 – 72 萃取和α计数法测定钚 73 – 80 萃取-α计数法测定镎 81 – 88 原子吸收法测定六氟化铀中可溶铬 89 – 95 原子吸收法测定六氟化铀中不溶铬 101 – 102 六氟化铀中锝-99的测定 103 – 110 六氟化铀裂变产物γ能发射率的测定方法 112 ICP-AES法测定金属杂质 113 – 122 ICP-AES法测定钼、铌、钽、钛和钨 123 – 132 1.3 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 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。 （有关具体的保障和安全考虑声明，请参阅第节。） 7. .) 1.5 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====== 4.1 六氟化铀是制备核反应堆燃料的基本材料。为此，材料必须符合铀含量、同位素成分、金属杂质、碳氢化合物和卤代烃含量的标准。这些测试方法旨在确定材料是否符合规范中所述的要求 C787 和 C996 .

1.1 These test methods cover or give reference to procedures for subsampling and for chemical, mass spectrometric, spectrochemical, nuclear, and radiochemical analysis of uranium hexafluoride (UF 6 ). Most of these test methods are in routine use to determine conformance to UF 6 specifications in the Enrichment and Conversion Facilities. 1.2 The analytical procedures in this document appear in the following order: Note 1: Subcommittee C26.05 will confer with C26.02 concerning the renumbered section in Test Methods C761 to determine how concerns with renumbering these sections are best addressed in subsequent publications as analytical methods are replaced with stand-alone analytical methods. Sections Subsampling of Uranium Hexafluoride 8 Gravimetric Determination of Uranium 9 – 17 Titrimetric Determination of Uranium 18 Preparation of High-Purity U 3 O 8 19 Isotopic Analysis 20 Determination of Hydrocarbons, Chlorocarbons, and Partially Substituted Halohydrocarbons 21 – 27 Determination of Antimony 28 Determination of Bromine 29 Determination of Chlorine 30 – 36 Determination of Silicon and Phosphorus 37 – 43 Determination of Boron and Silicon 44 Determination of Ruthenium 45 Determination of Titanium and Vanadium 46 Spectrographic Determination of Metallic Impurities 47 Determination of Tungsten 48 Determination of Thorium and Rare Earths 49 Determination of Molybdenum 50 Atomic Absorption Determination of Metallic Impurities 51 – 56 Impurity Determination by Spark-Source Mass Spectrography 57 Determination of Boron-Equivalent Neutron Cross Section 58 Determination of Uranium-233 Abundance by Thermal Ionization Mass Spectrometry 59 Determination of Uranium-232 by Alpha Spectrometry 60 – 66 Determination of Fission Product Activity 67 Determination of Plutonium by Ion Exchange and Alpha Counting 68 – 72 Determination of Plutonium by Extraction and Alpha Counting 73 – 80 Determination of Neptunium by Extraction and Alpha Counting 81 – 88 Atomic Absorption Determination of Chromium Soluble In Uranium Hexafluoride 89 – 95 Atomic Absorption Determination of Chromium Insoluble In Uranium Hexafluoride 101 – 102 Determination of Technetium-99 In Uranium Hexafluoride 103 – 110 Method for the Determination of Gamma-Energy Emission Rate from Fission Products in Uranium Hexafluoride 112 Determination of Metallic Impurities by ICP-AES 113 – 122 Determination of Molybdenum, Niobium, Tantalum, Titanium, and Tungsten by ICP-AES 123 – 132 1.3 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard. 1.4 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. (For specific safeguard and safety consideration statements, see Section 7 .) 1.5 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 ====== 4.1 Uranium hexafluoride is a basic material used to prepare nuclear reactor fuel. To be suitable for this purpose the material must meet criteria for uranium content, isotopic composition, metallic impurities, hydrocarbon and halohydrocarbon content. These test methods are designed to determine whether the material meets the requirements described in Specifications C787 and C996 .