A new HALEU isotopic certified reference material

Kayron T. Rogers; Carson E. Grant; Cole R. Hexel; Jenn H. Parikh; Kellen W.E. Springer; Benjamin T. Manard; Brian W. Ticknor; Peter B. Mason; Richard M. Essex

doi:10.1007/s10967-025-10551-y

A new HALEU isotopic certified reference material

Kayron T. Rogers, Carson E. Grant, Cole R. Hexel, Jenn H. Parikh, Kellen W.E. Springer, Benjamin T. Manard, Brian W. Ticknor, Peter B. Mason, Richard M. Essex

Research output: Contribution to journal › Article › peer-review

Abstract

Candidate certified reference material (CRM) U196 was prepared by gravimetrically mixing and dissolving NNSA NRMP CRM 112-A (natural uranium metal) and CRM 116-A (highly enriched 93.2% ²³⁵U metal) to achieve a high-assay low-enriched uranium (HALEU) isotopic abundance reference material. CRM U196 will be certified for the ²³³U/²³⁸U, ²³⁴U/²³⁸U, ²³⁵U/²³⁸U, and ²³⁶U/²³⁸U ratios. Gravimetrically determined uranium isotope amount ratios and values derived from the isotope data were calculated from the buoyancy corrected mass data and from certified values for the metal CRMs used to create the solution. The ²³⁵U isotope amount fraction (·100) and expanded uncertainty is 19.5846 ± 0.0028. For attribute verification, total evaporation and modified total evaporation isotope ratio measurements were performed. The reference material is to be distributed as a unit containing 5 mg uranium as dry uranyl nitrate.

Original language	English
Journal	Journal of Radioanalytical and Nuclear Chemistry
DOIs	https://doi.org/10.1007/s10967-025-10551-y
State	Accepted/In press - 2025

Funding

The authors would like to thank the NNSA NMRP and the Office of Stockpile Production Integration (NA-121) within the US Department of Energy for funding and advisement. We also thank the organizers of MARC XIII (International Conference on Methods of Applications of Radioanalytical Chemistry) for a wonderful conference and the opportunity to present this work.

Keywords

High-assay low-enriched uranium
Reference material

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10.1007/s10967-025-10551-y

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title = "A new HALEU isotopic certified reference material",

abstract = "Candidate certified reference material (CRM) U196 was prepared by gravimetrically mixing and dissolving NNSA NRMP CRM 112-A (natural uranium metal) and CRM 116-A (highly enriched 93.2\% 235U metal) to achieve a high-assay low-enriched uranium (HALEU) isotopic abundance reference material. CRM U196 will be certified for the 233U/238U, 234U/238U, 235U/238U, and 236U/238U ratios. Gravimetrically determined uranium isotope amount ratios and values derived from the isotope data were calculated from the buoyancy corrected mass data and from certified values for the metal CRMs used to create the solution. The 235U isotope amount fraction (·100) and expanded uncertainty is 19.5846 ± 0.0028. For attribute verification, total evaporation and modified total evaporation isotope ratio measurements were performed. The reference material is to be distributed as a unit containing 5 mg uranium as dry uranyl nitrate.",

keywords = "High-assay low-enriched uranium, Reference material",

author = "Rogers, \{Kayron T.\} and Grant, \{Carson E.\} and Hexel, \{Cole R.\} and Parikh, \{Jenn H.\} and Springer, \{Kellen W.E.\} and Manard, \{Benjamin T.\} and Ticknor, \{Brian W.\} and Mason, \{Peter B.\} and Essex, \{Richard M.\}",

note = "Publisher Copyright: {\textcopyright} This is a U.S. Government work and not under copyright protection in the US; foreign copyright protection may apply 2025.",

year = "2025",

doi = "10.1007/s10967-025-10551-y",

language = "English",

journal = "Journal of Radioanalytical and Nuclear Chemistry",

issn = "0236-5731",

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T1 - A new HALEU isotopic certified reference material

AU - Rogers, Kayron T.

AU - Grant, Carson E.

AU - Hexel, Cole R.

AU - Parikh, Jenn H.

AU - Springer, Kellen W.E.

AU - Manard, Benjamin T.

AU - Ticknor, Brian W.

AU - Mason, Peter B.

AU - Essex, Richard M.

PY - 2025

Y1 - 2025

N2 - Candidate certified reference material (CRM) U196 was prepared by gravimetrically mixing and dissolving NNSA NRMP CRM 112-A (natural uranium metal) and CRM 116-A (highly enriched 93.2% 235U metal) to achieve a high-assay low-enriched uranium (HALEU) isotopic abundance reference material. CRM U196 will be certified for the 233U/238U, 234U/238U, 235U/238U, and 236U/238U ratios. Gravimetrically determined uranium isotope amount ratios and values derived from the isotope data were calculated from the buoyancy corrected mass data and from certified values for the metal CRMs used to create the solution. The 235U isotope amount fraction (·100) and expanded uncertainty is 19.5846 ± 0.0028. For attribute verification, total evaporation and modified total evaporation isotope ratio measurements were performed. The reference material is to be distributed as a unit containing 5 mg uranium as dry uranyl nitrate.

AB - Candidate certified reference material (CRM) U196 was prepared by gravimetrically mixing and dissolving NNSA NRMP CRM 112-A (natural uranium metal) and CRM 116-A (highly enriched 93.2% 235U metal) to achieve a high-assay low-enriched uranium (HALEU) isotopic abundance reference material. CRM U196 will be certified for the 233U/238U, 234U/238U, 235U/238U, and 236U/238U ratios. Gravimetrically determined uranium isotope amount ratios and values derived from the isotope data were calculated from the buoyancy corrected mass data and from certified values for the metal CRMs used to create the solution. The 235U isotope amount fraction (·100) and expanded uncertainty is 19.5846 ± 0.0028. For attribute verification, total evaporation and modified total evaporation isotope ratio measurements were performed. The reference material is to be distributed as a unit containing 5 mg uranium as dry uranyl nitrate.

KW - High-assay low-enriched uranium

KW - Reference material

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DO - 10.1007/s10967-025-10551-y

M3 - Article

AN - SCOPUS:105022406661

SN - 0236-5731

JO - Journal of Radioanalytical and Nuclear Chemistry

JF - Journal of Radioanalytical and Nuclear Chemistry

ER -

A new HALEU isotopic certified reference material

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Keywords

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