Thorium and Uranium Isotopes in Arctic Sediments

1989 ◽  
pp. 571-579 ◽  
Author(s):  
B. L. K. Somayajulu ◽  
P. Sharma ◽  
Yvonne Herman
Keyword(s):  
Uranium Isotopes

Investigation of an Alleged Nuclear Incident at Greenham Common Airbase Using TI-mass Spectrometric Measurements of Uranium Isotopes

2000 ◽  
Vol 34 (21) ◽  
pp. 4496-4503 ◽  
Author(s):  
Ian W. Croudace ◽  
Phillip E. Warwick ◽  
Rex N. Taylor ◽  
Andrew B. Cundy
Keyword(s):  
Mass Spectrometric ◽  
Uranium Isotopes ◽  
Spectrometric Measurements

scholarly journals New α -Emitting Isotope U214 and Abnormal Enhancement of α -Particle Clustering in Lightest Uranium Isotopes

2021 ◽  
Vol 126 (15) ◽  
Author(s):  
Z. Y. Zhang ◽  
H. B. Yang ◽  
M. H. Huang ◽  
Z. G. Gan ◽  
C. X. Yuan ◽  
...  
Keyword(s):  
Uranium Isotopes ◽  
Particle Clustering

scholarly journals Upper limits on the extent of seafloor anoxia during the PETM from uranium isotopes

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Matthew O. Clarkson ◽  
Timothy M. Lenton ◽  
Morten B. Andersen ◽  
Marie-Laure Bagard ◽  
Alexander J. Dickson ◽  
...  
Keyword(s):  
Carbon Cycle ◽  
Global Scale ◽  
Uranium Isotopes ◽  
Biogeochemical Model ◽  
Emission Scenarios ◽  
Isotope Data ◽  
Upper Limit ◽  
Thermal Maximum ◽  
Upper Limits ◽  
Anoxic Events

AbstractThe Paleocene Eocene Thermal Maximum (PETM) represents a major carbon cycle and climate perturbation that was associated with ocean de-oxygenation, in a qualitatively similar manner to the more extensive Mesozoic Oceanic Anoxic Events. Although indicators of ocean de-oxygenation are common for the PETM, and linked to biotic turnover, the global extent and temporal progression of de-oxygenation is poorly constrained. Here we present carbonate associated uranium isotope data for the PETM. A lack of resolvable perturbation to the U-cycle during the event suggests a limited expansion of seafloor anoxia on a global scale. We use this result, in conjunction with a biogeochemical model, to set an upper limit on the extent of global seafloor de-oxygenation. The model suggests that the new U isotope data, whilst also being consistent with plausible carbon emission scenarios and observations of carbon cycle recovery, permit a maximum ~10-fold expansion of anoxia, covering <2% of seafloor area.

Rapid mineral surface weathering beneath the Greenland Ice Sheet shown by radium and uranium isotopes

2020 ◽  
Vol 547 ◽  
pp. 119663
Author(s):  
Benjamin S. Linhoff ◽  
Mathew A. Charette ◽  
Jemma Wadham
Keyword(s):  
Ice Sheet ◽  
Greenland Ice Sheet ◽  
Uranium Isotopes ◽  
Mineral Surface

scholarly journals Third minima in thorium and uranium isotopes in a self-consistent theory

2013 ◽  
Vol 87 (5) ◽  
Author(s):  
J. D. McDonnell ◽  
W. Nazarewicz ◽  
J. A. Sheikh
Keyword(s):  
Uranium Isotopes ◽  
Consistent Theory ◽  
Self Consistent

DETERMINATION AND DOSE CONTRIBUTION OF URANIUM ISOTOPES AND 210Po ACTIVITY CONCENTRATIONS OF NATURAL SPRING WATERS IN THE PROVINCE OF GRANADA, SPAIN

2018 ◽  
Vol 181 (4) ◽  
pp. 350-359 ◽  
Author(s):  
A Milena-Pérez ◽  
F Piñero-García ◽  
V M Expósito-Suárez ◽  
J Mantero ◽  
J Benavente ◽  
...  
Keyword(s):  
Uranium Isotopes ◽  
Activity Concentrations ◽  
210Po Activity ◽  
Natural Spring
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