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Journal Articles

The Application of radiochronometry during the 4th collaborative materials exercise of the nuclear forensics international technical working group (ITWG)

Kristo, M. J.*; Williams, R.*; Gaffney, A. M.*; Kayzar-Boggs, T. M.*; Schorzman, K. C.*; Lagerkvist, P.*; Vesterlund, A.*; Rameb$"a$ck, H.*; Nelwamondo, A. N.*; Kotze, D.*; et al.

Journal of Radioanalytical and Nuclear Chemistry, 315(2), p.425 - 434, 2018/02

https://doi.org/10.1007/s10967-017-5680-5
 Times Cited Count：14 Percentile：81.7(Chemistry, Analytical)

In a recent international exercise, 10 international nuclear forensics laboratories successfully performed radiochronometry on three low enriched uranium oxide samples, providing 12 analytical results using three different parent-daughter pairs serving as independent chronometers. The vast majority of the results were consistent with one another and consistent with the known processing history of the materials. In general, for these particular samples, mass spectrometry gave more accurate and more precise analytical results than decay counting measurements. In addition, the concordance of the $$^{235}$$U-$$^{231}$$Pa and $$^{234}$$U-$$^{230}$$Th chronometers confirmed the validity of the age dating assumptions, increasing confidence in the resulting conclusions.

Journal Articles

Eu isotope measurements on single SiC grains from the Murchison meteorite; A New probe of s-process conditions in parent Asymptotic Giant Branch stars

Terada, Kentaro*; Ito, Katsunori*; Hidaka, Hiroshi*; Yoshida, Takashi*; Iwamoto, Nobuyuki; Aoki, Wako*; Williams, I. S.*

New Astronomy Reviews, 50(7-8), p.582 - 586, 2006/10

https://doi.org/10.1016/j.newar.2006.06.006
 Times Cited Count：6 Percentile：20.42(Astronomy & Astrophysics)

Europium isotopic composition could be a good probe to investigate the neutron capture process in Asymptotic Giant Branch stars (AGB stars) and/or supernovae, because the $$^{151}$$Sm and $$^{153}$$Sm branchings are sensitive to the neutron densities and temperature. Here, we report Eu isotopic analyses of single SiC grains from primitive meteorites using the sensitive high resolution ion microprobe. The results are compared with Eu isotopic ratios predicted from the s-process model of AGB stars. The observed Eu isotopic composition of SiC grains place constraints on s-process conditions such as the temperature and neutron densities in AGB stars.

Journal Articles

SHRIMP measurements of U and Pb isotopes in the Koongarra secondary ore deposit, northern Australia

Nagano, Tetsushi; Sato, Tsutomu*; Williams, I. S.*; Zaw, M.*; Payne, T. E.*; Airey, P. L.*; Yanase, Nobuyuki; Isobe, Hiroshi*; Onuki, Toshihiko

Geochemical Journal, 34(5), p.349 - 358, 2000/10

https://doi.org/10.2343/geochemj.34.349
 Times Cited Count：4 Percentile：13.58(Geochemistry & Geophysics)

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