ASTM C 761:2024

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.

27.120.30