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7 results on '"Joanna S. Denton"'

1. A chromatography chemistry for purifying Pa from U-Nb metal alloys

Author

John R. Engel, Joanna S. Denton, Stephen P. Lamont, Jacob E. Buettner, Christine Y. Chen, Robert E. Steiner, and Theresa M. Kayzar-Boggs

Subjects
Nuclear Energy and Engineering, Health, Toxicology and Mutagenesis, Public Health, Environmental and Occupational Health, Radiology, Nuclear Medicine and imaging, Pollution, Spectroscopy, Analytical Chemistry
Published
2023

2. Improved methods to age-date uranium certified reference materials for nuclear forensics using the 231Pa/235U radiochronometer

Author

Joanna S. Denton, Allison M. Wende, Theresa M. Kayzar-Boggs, April R. Cardon, Mark A. Edwards, Matthew E. Sanborn, and Robert E. Steiner

Subjects
Nuclear Energy and Engineering, Health, Toxicology and Mutagenesis, Public Health, Environmental and Occupational Health, Radiology, Nuclear Medicine and imaging, Pollution, Spectroscopy, Analytical Chemistry
Published
2022

3. Establishing discordance as a radiochronometric signature for nuclear forensic investigations: a multi-laboratory intercomparison exercise

Author

Matthew A. Higginson, Theresa M. Kayzar-Boggs, Christine Y. Chen, Samuel T. J. Cross, Joanna S. Denton, James A. Dunne, Mark A. Edwards, Charlotte Eng, Amy M. Gaffney, Chris R. D. Gilligan, Maya N. Morris, John M. Rolison, Matthew E. Sanborn, and Allison M. Wende

Subjects
Nuclear Energy and Engineering, Health, Toxicology and Mutagenesis, Public Health, Environmental and Occupational Health, Radiology, Nuclear Medicine and imaging, Pollution, Spectroscopy, Analytical Chemistry
Published
2022

4. Separation of protactinium from uranium-niobium alloys for 231Pa–235U radiochronometry in nuclear forensic investigations

Author

Christine Yifeng Chen, Matthew A. Higginson, Theresa M. Kayzar-Boggs, Joanna S. Denton, James Dunne, Mark A. Edwards, Charlotte Eng, John R. Engel, Amy M. Gaffney, Chris Gilligan, Maya N. Morris, John M. Rolison, Matthew E. Sanborn, and Allison M. Wende

Subjects
Nuclear Energy and Engineering, Health, Toxicology and Mutagenesis, Public Health, Environmental and Occupational Health, Radiology, Nuclear Medicine and imaging, Pollution, Spectroscopy, Analytical Chemistry
Published
2023

5. International interlaboratory compilation of trace element concentrations in the CUP-2 uranium ore concentrate standard

Author

Joanna S. Denton, Debra A. Bostick, Sergei F. Boulyga, J. Alan Cunningham, Ike Dimayuga, Cole R. Hexel, Joe Hiess, Slobodan V. Jovanovic, Philip Kaye, Tara Kell, Fiona Kelly, William Kinman, Stephen Kiser, Rachel E. Lindvall, Zsuzsanna Macsik, Benjamin T. Manard, Klaus Mayer, Jean-Francois Mercier, Pavel Samuleev, Patrick R. B. Saull, Youqing Shi, Robert. E. Steiner, Brian W. Ticknor, Marina Totland, Zsolt Varga, Maria Wallenius, and E. Miller Wylie

Subjects
Nuclear Energy and Engineering, Health, Toxicology and Mutagenesis, Public Health, Environmental and Occupational Health, Radiology, Nuclear Medicine and imaging, Pollution, Spectroscopy, Analytical Chemistry
Published
2022

6. International cooperation in age-dating uranium standards for nuclear forensics using the 231Pa/235U radiochronometer

Author

Joanna S. Denton, Amy M. Gaffney, Kyle M. Samperton, Eva Baransky, Kerri C. Treinen, Robert E. Steiner, Yan Chen, Ross W. Williams, Allison Wende, Sheng-Hui Huang, Theresa M. Kayzar-Boggs, and Yong-Gang Zhao

Subjects
Health, Toxicology and Mutagenesis, Nuclear forensics, Atomic energy, Nuclear engineering, Public Health, Environmental and Occupational Health, chemistry.chemical_element, Uranium, 010403 inorganic & nuclear chemistry, 01 natural sciences, Pollution, 0104 chemical sciences, Analytical Chemistry, Nuclear Energy and Engineering, chemistry, Environmental science, Radiology, Nuclear Medicine and imaging, Consensus model, National laboratory, Spectroscopy
Abstract

During 2017–2018 Los Alamos National Laboratory, Lawrence Livermore National Laboratory and the China Institute of Atomic Energy collaborated in an interlaboratory 231Pa/235U radiochronometry exercise. The laboratories used different analytical methods to obtain a consensus model purification date for CRM U010 of December 28, 1958 ± 198 days and for CRM U850 of May 20, 1958 ± 363 days. These results agree with previously reported model dates using the 230Th/234U radiochronometer as well as the production histories of these materials. The concordance of interlaboratory data confirms the ability of laboratories to make reproducible radiochronometry measurements using distinct analytical approaches.

Published
2020

7. An interlaboratory collaboration to determine consensus 231Pa/235U model ages of a uranium certified reference material for nuclear forensics

Author

Allison Wende, Theresa M. Kayzar-Boggs, Amy M. Gaffney, Robert E. Steiner, Joanna S. Denton, Kerri C. Treinen, Ross W. Williams, Ayako Okubo, and Martha M. Miller

Subjects
Engineering, business.industry, Health, Toxicology and Mutagenesis, Nuclear forensics, Public Health, Environmental and Occupational Health, Library science, chemistry.chemical_element, Uranium, Pollution, Analytical Chemistry, Certified reference materials, Nuclear Energy and Engineering, chemistry, Radiology, Nuclear Medicine and imaging, business, National laboratory, Spectroscopy
Abstract

Application of the 231Pa/235U radiochronometer for nuclear forensic investigations is challenged by a lack of certified reference materials with 231Pa/235U model purification dates. The Japan Atomic Energy Agency, Los Alamos National Laboratory, and Lawrence Livermore National Laboratory completed an interlaboratory study measuring 231Pa/235U model ages of New Brunswick Laboratory CRM U100. Results from independent laboratories were combined to calculate a consensus 231Pa/235U model purification date for CRM U100 of March 26, 1959 ± 237 days. This 231Pa/235U consensus date for CRM U100 may be used by the nuclear forensic community for quality control of 231Pa/235U radiochronometry measurements of unknown materials.

Published
2020

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