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Title: Measuring Uranium Decay Rates for Advancement of Nuclear Forensics and Geochronology

Abstract

Radioisotopic dating techniques are highly valuable tools for understanding the history of physical and chemical processes in materials related to planetary sciences and nuclear forensics, and rely on accurate knowledge of decay constants and their uncertainties. The decay constants of U-238 and U-235 are particularly important to Earth science, and often the measured values with lowest reported uncertainties are applied, although they have not been independently verified with similar precision. New direct measurements of the decay constants of U-238, Th-234, U-235, and U-234 were completed, using a range of analytical approaches. An overarching goal of the project was to ensure the quality of results, including metrological traceability to facilitate implementation across diverse disciplines. This report presents preliminary results of these experiments, as a few final measurements and calculations are still in progress.

Authors:
 [1]
  1. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Publication Date:
Research Org.:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1411707
Report Number(s):
LLNL-TR-742524
DOE Contract Number:  
AC52-07NA27344
Resource Type:
Technical Report
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; 58 GEOSCIENCES; 38 RADIATION CHEMISTRY, RADIOCHEMISTRY, AND NUCLEAR CHEMISTRY

Citation Formats

Parsons-Davis, Tashi. Measuring Uranium Decay Rates for Advancement of Nuclear Forensics and Geochronology. United States: N. p., 2017. Web. doi:10.2172/1411707.
Parsons-Davis, Tashi. Measuring Uranium Decay Rates for Advancement of Nuclear Forensics and Geochronology. United States. doi:10.2172/1411707.
Parsons-Davis, Tashi. Tue . "Measuring Uranium Decay Rates for Advancement of Nuclear Forensics and Geochronology". United States. doi:10.2172/1411707. https://www.osti.gov/servlets/purl/1411707.
@article{osti_1411707,
title = {Measuring Uranium Decay Rates for Advancement of Nuclear Forensics and Geochronology},
author = {Parsons-Davis, Tashi},
abstractNote = {Radioisotopic dating techniques are highly valuable tools for understanding the history of physical and chemical processes in materials related to planetary sciences and nuclear forensics, and rely on accurate knowledge of decay constants and their uncertainties. The decay constants of U-238 and U-235 are particularly important to Earth science, and often the measured values with lowest reported uncertainties are applied, although they have not been independently verified with similar precision. New direct measurements of the decay constants of U-238, Th-234, U-235, and U-234 were completed, using a range of analytical approaches. An overarching goal of the project was to ensure the quality of results, including metrological traceability to facilitate implementation across diverse disciplines. This report presents preliminary results of these experiments, as a few final measurements and calculations are still in progress.},
doi = {10.2172/1411707},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Tue Oct 31 00:00:00 EDT 2017},
month = {Tue Oct 31 00:00:00 EDT 2017}
}

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