Skip to main content
U.S. flag

An official website of the United States government

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Secure .gov websites use HTTPS
A lock ( ) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.

New thorium-229 standard reference material

Published

Author(s)

Richard Essex, Jacqueline L. Mann, Ross W. Williams, William S. Kinman, Amelie Hubert, Megan E. Bennett

Abstract

A new reference material, preliminarily designated as SRM 3059, was characterized for 229Th molality (mol•g-1) and thorium isotope amount ratios. This SRM is intended for use in nuclear forensic analyses as an isotope dilution mass spectrometry spike. The value and expanded uncertainty (k = 2) for the 229Th molality is (1.1498 ± 0.0016) • 10-10 mol • g-1 solution. The values and expanded uncertainty (k = 2) for the n(230Th)/n(229Th) ratio is (5.18 ± 0.26) • 10-5 and the n(232Th)/n(229Th) ratio is (3.815 ± 0.092) • 10-4.
Citation
Applied Radiation and Isotopes
Volume
134

Keywords

thorium, isotope dilution mass spectrometry, nuclear forensics, radiochronometry, reference material

Citation

Essex, R. , Mann, J. , Williams, R. , Kinman, W. , Hubert, A. and Bennett, M. (2017), New thorium-229 standard reference material, Applied Radiation and Isotopes, [online], https://doi.org/10.1016/j.apradiso.2017.07.050 (Accessed October 27, 2021)
Created July 26, 2017, Updated June 24, 2021