1.1 这些试验方法涵盖或参考了六氟化铀的二次取样和化学、质谱、光谱化学、核和放射化学分析的程序 6 ).这些测试方法中的大多数通常用于确定是否符合UF 6 浓缩和转化设施的规格。 1.2 本文件中的分析方法按以下顺序出现: 附注1: 小组委员会C26.05将与C26.02讨论试验方法中重新编号的章节 C761 确定随着分析方法被独立的分析方法取代，如何在后续出版物中最好地解决对这些章节重新编号的问题。 章节 六氟化铀二次取样 8 重量法测定铀 9 – 17 滴定法测定铀 18 高纯U的制备 3 O 8 19 同位素分析 20 烃、氯代烃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 钍和稀土元素的测定 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 裂变产物活性的测定 67 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 萃取法和α计数法测定镎 81 – 88 原子吸收法测定六氟化铀中可溶性铬 89 – 95 原子吸收法测定六氟化铀中不溶性铬 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SI单位表示的值将被视为标准值。以pH单位表示的氢离子浓度的非SI单位和以每分钟崩解次数(符号dpm)和每分钟计数(符号cpm)表示的放射性衰变的非SI单位被视为标准。每分钟转数的非国际单位制单位，符号rpm，也被视为标准。 1.4 本标准并不旨在解决与其使用相关的所有安全性问题（如果有）。本标准的使用者有责任在使用前建立适当的安全、健康和环境实践并确定法规限制的适用性。 （有关具体的保障措施和安全考虑声明，请参见第节 7 .) 1.5 本国际标准是根据关于制定国际标准、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世界贸易组织技术性贸易壁垒（TBT）委员会发布的离子。 ======意义和用途====== 4.1 六氟化铀是用于制备核反应堆燃料的基础材料。为了适用于此目的，材料必须满足铀含量、同位素组成、金属杂质、碳氢化合物和卤代碳氢化合物含量的标准。这些试验方法旨在确定材料是否符合质量标准中描述的要求 C787 和 C996 . 4.2 为保障和核安全应用目的的适用性- 用于保障和核安全应用的方法应符合指南规定的要求 C1068 用于此类应用中。然而，遵守这些程序并不自动保证监管机构接受由此产生的保障措施。这些测试方法的用户仍然有责任确保其在保障措施中的应用得到适当监管机构的批准。 4.3 当与适当的认证参考物质(CRM)结合使用时，这些程序可以证明对国家测量基础的可追溯性。

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 Earth Elements 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. The non-SI unit for hydrogen ion concentration expressed in pH units, and non-SI units for radioactive decay expressed as both disintegrations per minute, symbol dpm, and counts per minute, symbol cpm, are regarded as standard. The non-SI unit of revolutions per minute, symbol rpm, is also regarded as 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 . 4.2 Fitness for Purpose of Safeguards and Nuclear Safety Applications— Methods intended for use in safeguards and nuclear safety applications shall meet the requirements specified by Guide C1068 for use in such applications. However, adherence to these procedures does not automatically guarantee regulatory acceptance of the resulting safeguards measurements. It remains the sole responsibility of the user of these test methods to assure that its application to safeguards has the approval of the proper regulatory authorities. 4.3 When used in conjunction with appropriate certified reference materials (CRMs), these procedures can demonstrate traceability to the national measurement base.