ASTM C761 - 18

    Standard Test Methods for Chemical, Mass Spectrometric, Spectrochemical, Nuclear, and Radiochemical Analysis of Uranium Hexafluoride

    Active Standard ASTM C761 | Developed by Subcommittee: C26.05

    Book of Standards Volume: 12.01

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    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.

    1. Scope

    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.



    Subsampling of Uranium Hexafluoride


    Gravimetric Determination of Uranium

    9 – 17

    Titrimetric Determination of Uranium


    Preparation of High-Purity U3O8


    Isotopic Analysis


    Determination of Hydrocarbons, Chlorocarbons, and Partially Substituted Halohydrocarbons

    21 – 27

    Determination of Antimony


    Determination of Bromine


    Determination of Chlorine

    30 – 36

    Determination of Silicon and Phosphorus

    37 – 43

    Determination of Boron and Silicon


    Determination of Ruthenium


    Determination of Titanium and Vanadium


    Spectrographic Determination of Metallic Impurities


    Determination of Tungsten


    Determination of Thorium and Rare Earths


    Determination of Molybdenum


    Atomic Absorption Determination of Metallic Impurities

    51 – 56

    Impurity Determination by Spark-Source Mass Spectrography


    Determination of Boron-Equivalent Neutron Cross Section


    Determination of Uranium-233 Abundance by Thermal Ionization Mass Spectrometry


    Determination of Uranium-232 by Alpha Spectrometry

    60 – 66

    Determination of Fission Product Activity


    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


    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.

    2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.

    ASTM Standards

    C787 Specification for Uranium Hexafluoride for Enrichment

    C799 Test Methods for Chemical, Mass Spectrometric, Spectrochemical, Nuclear, and Radiochemical Analysis of Nuclear-Grade Uranyl Nitrate Solutions

    C859 Terminology Relating to Nuclear Materials

    C996 Specification for Uranium Hexafluoride Enriched to Less Than 5% 235U

    C1128 Guide for Preparation of Working Reference Materials for Use in Analysis of Nuclear Fuel Cycle Materials

    C1219 Test Methods for Arsenic in Uranium Hexafluoride

    C1233 Practice for Determining Equivalent Boron Contents of Nuclear Materials

    C1267 Test Method for Uranium by Iron (II) Reduction in Phosphoric Acid Followed by Chromium (VI) Titration in the Presence of Vanadium

    C1287 Test Method for Determination of Impurities in Nuclear Grade Uranium Compounds by Inductively Coupled Plasma Mass Spectrometry

    C1295 Test Method for Gamma Energy Emission from Fission and Decay Products in Uranium Hexafluoride and Uranyl Nitrate Solution

    C1344 Test Method for Isotopic Analysis of Uranium Hexafluoride by Single-Standard Gas Source Mass Spectrometer Method

    C1346 Practice for Dissolution of UF6 from P-10 Tubes

    C1380 Test Method for the Determination of Uranium Content and Isotopic Composition by Isotope Dilution Mass Spectrometry

    C1413 Test Method for Isotopic Analysis of Hydrolyzed Uranium Hexafluoride and Uranyl Nitrate Solutions by Thermal Ionization Mass Spectrometry

    C1428 Test Method for Isotopic Analysis of Uranium Hexafluoride by Single-Standard Gas Source Multiple Collector Mass Spectrometer Method

    C1429 Test Method for Isotopic Analysis of Uranium Hexafluoride by Double-Standard Multi-Collector Gas Mass Spectrometer

    C1441 Test Method for The Analysis of Refrigerant 114, Plus Other Carbon-Containing and Fluorine-Containing Compounds in Uranium Hexafluoride via Fourier-Transform Infrared (FTIR) Spectroscopy

    C1474 Test Method for Analysis of Isotopic Composition of Uranium in Nuclear-Grade Fuel Material by Quadrupole Inductively Coupled Plasma-Mass Spectrometry

    C1477 Test Method for Isotopic Abundance Analysis of Uranium Hexafluoride and Uranyl Nitrate Solutions by Multi-Collector, Inductively Coupled Plasma-Mass Spectrometry

    C1508 Test Method for Determination of Bromine and Chlorine in UF6 and Uranyl Nitrate by X-Ray Fluorescence (XRF) Spectroscopy

    C1539 Test Method for Determination of Technetium-99 in Uranium Hexafluoride by Liquid Scintillation Counting

    C1561 Guide for Determination of Plutonium and Neptunium in Uranium Hexafluoride and U-Rich Matrix by Alpha Spectrometry

    C1636 Guide for the Determination of Uranium-232 in Uranium Hexafluoride

    C1689 Practice for Subsampling of Uranium Hexafluoride

    C1742 Test Method for Isotopic Analysis of Uranium Hexafluoride by Double Standard Single-Collector Gas Mass Spectrometer Method

    D1193 Specification for Reagent Water

    D3084 Practice for Alpha-Particle Spectrometry of Water

    E60 Practice for Analysis of Metals, Ores, and Related Materials by Spectrophotometry

    ISO Standards

    ISO 7195 Nuclear Energy-Packaging of Uranium Hexafluoride (UF6) for Transport

    ANSI Standards

    ANSI N 14.1 Nuclear Material-Uranium Hexafluoride-Packaging for Transport

    Other Specifications

    Uranium Hexafluoride: Base Charges, Use Charges, Special Charges, Table of Enriching Services, Specifications, and Packaging United States Department of Energy, Oak Ridge, TN 37830.

    American Chemical Society Specification

    Reagent Chemicals Reagent Chemicals, American Chemical Society Specifications, American Chemical Society, Washington, DC. For suggestions on the testing of reagents not listed by the American Chemical Society, see Analar Standards for Laboratory Chemicals, BDH Ltd., Poole, Dorset, U.K. and the United States Pharmacopeia and National Formulary, U.S. Pharmacopeial Convention, Inc. (USPC), Rockville, MD.

    ICS Code

    ICS Number Code 27.120.30 (Fissile materials and nuclear fuel technology)

    UNSPSC Code

    UNSPSC Code 15131500(Nuclear fuel)

    Referencing This Standard
    Link Here
    Link to Active (This link will always route to the current Active version of the standard.)

    DOI: 10.1520/C0761-18

    Citation Format

    ASTM C761-18, Standard Test Methods for Chemical, Mass Spectrometric, Spectrochemical, Nuclear, and Radiochemical Analysis of Uranium Hexafluoride, ASTM International, West Conshohocken, PA, 2018,

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