A5037800176- Radioactive contamination and transfer
- Geological and Geochemical Analysis
- Radioactive element chemistry and processing
- Geology and Paleoclimatology Research
- Nuclear Materials and Properties
- Nuclear Physics and Applications
- Radioactivity and Radon Measurements
- Nuclear Issues and Defense
- Nuclear and radioactivity studies
- Isotope Analysis in Ecology
- Paleontology and Stratigraphy of Fossils
- Ion-surface interactions and analysis
- Geochemistry and Elemental Analysis
- Astro and Planetary Science
- Laser-induced spectroscopy and plasma
- Nuclear reactor physics and engineering
- Combustion and Detonation Processes
- Archaeology and ancient environmental studies
- X-ray Spectroscopy and Fluorescence Analysis
- Time Series Analysis and Forecasting
- Silicon Effects in Agriculture
- Geochemistry and Geologic Mapping
- earthquake and tectonic studies
- Geomagnetism and Paleomagnetism Studies
- Analytical chemistry methods development
Lawrence Livermore National Laboratory
2015-2024
Lawrence Livermore National Security
2017-2018
University of Chicago
2008-2012
University of California, Berkeley
2001-2006
Planetary Science Institute
2001-2005
University of California System
2005
Berkeley Geochronology Center
2005
Research Article| November 01, 2004 Synchrony of the Central Atlantic magmatic province and Triassic-Jurassic boundary climatic biotic crisis Andrea Marzoli; Marzoli 1Dipartimento di Mineralogia e Petrologia, Università Padova, c. Garibaldi 37, 35137 Italy Search for other works by this author on: GSW Google Scholar Hervé Bertrand; Bertrand 2Laboratoire des Sciences de la Terre, UMR-CNRS 5570, Ecole Normale Supérieure Lyon, UCBL, 46, Allée d'Italie, 69364 France Kim B. Knight; Knight...
Nuclear forensic science seeks to identify the origin of nuclear materials found outside regulatory control. It is increasingly recognized as an integral part a robust security program. This review highlights areas active, evolving research in forensics, with focus on analytical techniques commonly employed Earth and planetary sciences. Applications forensics uranium ore concentrates (UOCs) are discussed first. UOCs have become attractive target for researchers because richness impurities...
Extensive outpourings of basalt, and to a lesser extent rhyolite, are closely associated with continental break-up plume–lithosphere interactions. The Gondwana supercontinent began fragment during Early–Middle Jurassic times was the eruption over three million km 3 dominantly basaltic magma. This intense magmatic episode is recorded in volcanic rocks Karoo (Africa), Ferrar (Antarctica) Chon Aike (South America). K–Ar Rb–Sr whole rock geochronology has consistently failed produce reliable...
In this study, we use laser ablation MC-ICP-MS as a rapid sampling tool to characterize the isotopic composition of uranium in μm-sized oxide particles.
The use of broad bandwidth lasers with automated feedback control wavelength was applied to the measurement 235U/238U ratios by resonance ionization mass spectrometry (RIMS) decrease laser-induced isotopic fractionation. By broadening first laser in a three-color, three-photon process from 1.8 GHz about 10 GHz, variation sequential relative isotope abundance measurements decreased 10% less than 0.5%. This procedure demonstrated for direct interrogation uranium oxide targets essentially no...
Abstract Magnesium and silicon isotopic profiles across melilite grains in two type B1 B2 calcium‐aluminum‐rich inclusions (CAIs) reveal differing but constant enrichments heavy isotopes everywhere except ≤1000 μm from the CAI margins. There is no close correlation B1s or B2s between composition åkermanite content of melilite, a measure progressive igneous crystallization, yet such might be expected B2: without mantle (as B1s) to seal interior off prevent further evaporation, melt would have...
We present the development of a steady state plasma flow reactor to investigate gas phase physical and chemical processes that occur at high temperature (1000 < T 5000 K) atmospheric pressure. The consists glass tube is attached an inductively coupled argon generator via adaptor (ring injector). have modeled system using computational fluid dynamics simulations are bounded by measured temperatures. In situ line-of-sight optical emission absorption spectroscopy been used determine structures...
Abstract In order to model the fate and transport of particles following a nuclear explosion, there must first be an understanding individual physical chemical processes that affect particle formation. One interaction pertinent fireball chemistry resultant debris formation is between uranium oxygen. this study, we use laser ablation metal in different concentrations oxygen gas, either 16 O 2 or 18 , determine influence on rapidly cooling uranium. Analysis recovered particulates using...