Sample matrix influence on the efficiency function modeling for uranium isotopes determination by gamma spectrometry

2021 ◽  
pp. 109891
Author(s):  
A. Vraničar ◽  
J. Nikolov ◽  
Đ. Lazarević ◽  
A. Rikalo ◽  
N. Todorović ◽  
...  
Keyword(s):  
Gamma Spectrometry ◽  
Uranium Isotopes ◽  
Efficiency Function ◽  
Sample Matrix ◽  
Matrix Influence

MULTIPLE, SHORT-LIVED OCEAN ANOXIC EVENTS ACROSS THE LATE DEVONIAN MASS EXTINCTION DETECTED USING URANIUM ISOTOPES OF MARINE CARBONATES

2016 ◽  
Author(s):  
David A. White ◽  
◽  
Maya Elrick ◽  
Stephen Romaniello ◽  
Feifei Zhang
Keyword(s):  
Mass Extinction ◽  
Uranium Isotopes ◽  
Late Devonian ◽  
Marine Carbonates ◽  
Anoxic Events

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 An adaptive multi-sensor resource allocation algorithm based on efficiency function

2021 ◽  
Vol 1738 ◽  
pp. 012088
Author(s):  
Jian Li ◽  
Xuanmin Lu ◽  
Yiwen Zhang ◽  
Zhiying Mou
Keyword(s):  
Resource Allocation ◽  
Efficiency Function ◽  
Resource Allocation Algorithm ◽  
Allocation Algorithm

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.

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