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Nuclear chemistry is the study of reactions that involve changes in nuclear structure. The nucleus of an atom is composed of protons and, except for hydrogen, neutrons. The number of protons in the nucleus is called the atomic number (Z) of the element, and the sum of the number of protons and the number of neutrons is the mass number (A). Atoms with the same atomic number but different mass numbers are isotopes of the same element.
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Natural Uranium Radioactivity Solution Standard: SRM 4321d.

Ronald Collé1, Lizbeth Laureano-Pérez1, Svetlana Nour1

  • 1National Institute of Standards and Technology, Gaithersburg, MD 20899-8462, USA.

Journal of Research of the National Institute of Standards and Technology
|December 8, 2021
PubMed
Summary

A new natural uranium solution standard (SRM 4321d) is available from NIST, certified for 234U, 235U, and 238U massic activities. This standard ensures accurate uranium measurements in nuclear science and environmental monitoring.

Keywords:
Standard Reference Material (SRM)isotope dilution analysisliquid scintillation (LS)natural uraniumuranium-234uranium-235uranium-238

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Area of Science:

  • Nuclear Chemistry
  • Metrology

Background:

  • Accurate quantification of uranium isotopes is crucial for nuclear applications and environmental safety.
  • Existing standards require updates to meet current metrological demands.

Purpose of the Study:

  • To produce and characterize a new natural uranium solution standard for isotopic analysis.
  • To provide a reliable reference material for the massic activities of 234U, 235U, and 238U.

Main Methods:

  • Preparation of a master solution from a well-characterized metallic uranium certified reference material (CRM 112-A).
  • Gravimetric dilution and quantitative dispensing into sealed ampoules.
  • Homogeneity assessment using photonic-emission integral counting.
  • Confirmatory measurements via liquid scintillation counting and isotope dilution alpha spectrometry.

Main Results:

  • SRM 4321d certified for the massic activities of 234U, 235U, and 238U.
  • Demonstrated homogeneity among dispensed units.
  • Validation of massic activities through multiple analytical techniques.

Conclusions:

  • The newly produced natural uranium solution standard (SRM 4321d) is suitable for its intended use.
  • This standard will enhance the accuracy and reliability of uranium isotope measurements.
  • NIST's dissemination of SRM 4321d supports metrological traceability in nuclear measurements.