【国外标准】 Standard Test Methods for Chemical, Mass Spectrometric, Spectrochemical, Nuclear, and Radiochemical Analysis of Uranium Hexafluoride

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 C996.1.1 These test methods cover or give reference to procedures for subsampling and for chemical, mass spectrometric, spectrochemical, nuclear, and radiochemical analysis of uranium hexafluoride (UF6). Most of these test methods are in routine use to determine conformance to UF6 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.  SectionsSubsampling of Uranium Hexafluoride 8Gravimetric Determination of Uranium 9 – 17Titrimetric Determination of Uranium 18Preparation of High-Purity U3O8 19Isotopic Analysis 20Determination of Hydrocarbons, Chlorocarbons, and Partially Substituted Halohydrocarbons 21 – 27Determination of Antimony 28Determination of Bromine 29Determination of Chlorine 30 – 36Determination of Silicon and Phosphorus 37 – 43Determination of Boron and Silicon 44Determination of Ruthenium 45Determination of Titanium and Vanadium 46Spectrographic Determination of Metallic Impurities 47Determination of Tungsten 48Determination of Thorium and Rare Earths 49Determination of Molybdenum 50Atomic Absorption Determination of Metallic Impurities 51 – 56Impurity Determination by Spark-Source Mass Spectrography 57Determination of Boron-Equivalent Neutron Cross Section 58Determination of Uranium-233 Abundance by Thermal Ionization Mass Spectrometry 59Determination of Uranium-232 by Alpha Spectrometry 60 – 66Determination of Fission Product Activity 67Determination of Plutonium by Ion Exchange and Alpha Counting 68 – 72Determination of Plutonium by Extraction and Alpha Counting 73 – 80Determination of Neptunium by Extraction and Alpha Counting 81 – 88Atomic Absorption Determination of Chromium Soluble In Uranium Hexafluoride 89 – 95Atomic Absorption Determination of Chromium Insoluble In Uranium Hexafluoride 101 – 102Determination of Technetium-99 In Uranium Hexafluoride 103 – 110Method for the Determination of Gamma-Energy Emission Rate from Fission Products in Uranium Hexafluoride 112Determination of Metallic Impurities by ICP-AES 113 – 122Determination of Molybdenum, Niobium, Tantalum, Titanium, and Tungsten by ICP-AES 123 – 1321.3 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.