Standard Active Last Updated: Feb 06, 2018
ASTM C761-18

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

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.


1.1 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.

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Book of Standards Volume: 12.01
Developed by Subcommittee: C26.05
Pages: 27
DOI: 10.1520/C0761-18
ICS Code: 27.120.30