ASTM C1832-23
Standard Test Method for Determination of Uranium Isotopic Composition by Modified Total Evaporation (MTE) Method Using Thermal Ionization Mass Spectrometer

Standard No.

ASTM C1832-23

Release Date

2023

Published By

American Society for Testing and Materials (ASTM)

Latest

ASTM C1832-23

Scope

1.1 This test method describes the determination of the isotope amount ratios of uranium material as nitrate solutions by the modified total evaporation (MTE) method using a thermal ionization mass spectrometer (TIMS) instrument. 1.2 The analytical performance in the determination of the 235 U/238 U major isotope amount ratio by MTE is similar to the (“classical”) total evaporation (TE) method as described in C1672. However, in the MTE method, the evaporation process is interrupted on a regular basis to allow measurements and subsequent corrections for background from peak tailing, perform internal calibration of a secondary electron multiplier (SEM) detector versus the Faraday cups, peak centering, and ion source refocusing. Performing these calibrations and corrections on a regular basis during the measurement, improves precision, and significantly reduces uncertainties for the minor isotope amount ratios 234 U/238 U and 236 U/238 U as compared to the TE method. 1.3 In principle, the MTE method may yield major isotope amount ratios without the need for mass fractionation correction. However, depending on the measurement conditions, small variations are observed between sample turrets. Therefore, a small correction based on measurements of a certified reference material is recommended to improve consistency. The uncertainty around the mass fractionation correction factor usually includes unity. 1.4 Units—The values stated in SI units are to be regarded as standard. The values given in parentheses after SI units are provided for information only and are not considered standard. 1.5 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. 1.6 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.

ASTM C1832-23 Referenced Document

• ASTM C1008 Standard Specification for Sintered (Uranium-Plutonium) Dioxide
  Pellets&x2014;Fast Reactor Fuel
• ASTM C1068 Standard Guide for Qualification of Measurement Methods by a Laboratory Within the Nuclear Industry
• ASTM C1128 Standard Guide for Preparation of Working Reference Materials for Use in the Analysis of Nuclear Fuel Cycle Materials
• ASTM C1156 Standard Guide for Establishing Calibration for a Measurement Method Used to Analyze Nuclear Fuel Cycle Materials
• ASTM C1347 Standard Practice for Preparation and Dissolution of Uranium Materials for Analysis
• ASTM C1411 Standard Practice for the Ion Exchange Separation of Uranium and Plutonium Prior to Isotopic Analysis
• ASTM C1625 Standard Test Method for Uranium and Plutonium Concentrations and Isotopic Abundances by Thermal Ionization Mass Spectrometry
• ASTM C1672 Standard Test Method for Determination of the Uranium, Plutonium or Americium Isotopic Composition or Concentration by the Total Evaporation Method Using a Thermal Ionization Mass Spectrometer*， 2024-01-26 Update
• ASTM C1871 Standard Test Method for Determination of Uranium Isotopic Composition by the Double Spike Method Using a Thermal Ionization Mass Spectrometer
• ASTM C753 Standard Specification for Nuclear-Grade, Sinterable Uranium Dioxide Powder
• ASTM C776 Standard Specification for Sintered Uranium Dioxide Pellets for Light Water Reactors
• ASTM C787 Standard Specification for Uranium Hexafluoride for Enrichment
• ASTM C833 Standard Specification for Sintered (Uranium-Plutonium) Dioxide Pellets
• ASTM C859 Standard Terminology Relating to Nuclear Materials
• ASTM C967 Standard Specification for Uranium Ore Concentrate
• ASTM C996 Standard Specification for Uranium Hexafluoride Enriched to Less Than 5% 235U1
• ASTM D1193 Standard Specification for Reagent Water
• ASTM E2586 Standard Practice for Calculating and Using Basic Statistics
• ASTM E2655 Standard Guide for Reporting Uncertainty of Test Results and Use of the Term Measurement Uncertainty in ASTM Test Methods

ASTM C1832-23 history

• 2023 ASTM C1832-23 Standard Test Method for Determination of Uranium Isotopic Composition by Modified Total Evaporation (MTE) Method Using Thermal Ionization Mass Spectrometer
• 2022 ASTM C1832-22 Standard Test Method for Determination of Uranium Isotopic Composition by Modified Total Evaporation (MTE) Method Using Thermal Ionization Mass Spectrometer
• 2021 ASTM C1832-21 Standard Test Method for Determination of Uranium Isotopic Composition by Modified Total Evaporation (MTE) Method Using Thermal Ionization Mass Spectrometer
• 2016 ASTM C1832-16 Standard Test Method for Determination of Uranium Isotopic Composition by the Modified Total Evaporation (MTE) Method Using a Thermal Ionization Mass Spectrometer