Gary R. Eppich

article

Uranium assay and trace element analysis of the fourth collaborative material exercise samples by the modified Davies-Gray method and the ICP-MS/OES techniques

Aubrey N. Nelwamondo, Lisa P. Colletti, Rachel E. Lindvall, Anna Vesterlund, more

Journal of Radioanalytical and Nuclear Chemistry > 2018 > 315 > 2 > 379-394

An international group of laboratories participating in CMX-4 subjected three samples to comparative nuclear forensic analysis using uranium assay and trace element analysis techniques to determine if the samples had similar or different origins. Uranium assay indicated that two pellet samples (ES-2 and ES-3) were nearly pure UO₂ while the black powder sample ES-1 was primarily UO₂ with UO₃ and/or...

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Fall, recovery, and characterization of the Novato L6 chondrite breccia

Peter Jenniskens, Alan E. Rubin, Qing‐Zhu Yin, Derek W. G. Sears, more

Meteoritics & Planetary Science > 49 > 8 > 1388 - 1425

The Novato L6 chondrite fragmental breccia fell in California on 17 October 2012, and was recovered after the Cameras for Allsky Meteor Surveillance (CAMS) project determined the meteor's trajectory between 95 and 46 km altitude. The final fragmentation from 42 to 22 km altitude was exceptionally well documented by digital photographs. The first sample was recovered before rain hit the area. First...

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Constraints on fallout melt glass formation from a near-surface nuclear test

Gary R. Eppich, Kim B. Knight, Timothy W. Jacomb-Hood, Gregory D. Spriggs, more

Journal of Radioanalytical and Nuclear Chemistry > 2014 > 302 > 1 > 593-609

We present major element and actinide composition data from a population of fallout glass samples produced from a single near-surface nuclear detonation. Glass major element compositions indicate that composition of local geology is a primary control on bulk fallout chemical composition. Uranium isotope compositions indicate that vaporized, residual fuel was incorporated into the melts prior to solidification,...

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Evaluation of historical beryllium abundance in soils, airborne particulates and facilities at Lawrence Livermore National Laboratory

Mark Sutton, Richard K. Bibby, Gary R. Eppich, Steven Lee, more

Science of the Total Environment > 2012 > 437 > Complete > 373-383

Beryllium has been historically machined, handled and stored in facilities at Lawrence Livermore National Laboratory (LLNL) since the 1950s. Additionally, outdoor testing of beryllium-containing components has been performed at LLNL's Site 300 facility. Beryllium levels in local soils and atmospheric particulates have been measured over three decades and are comparable to those found elsewhere in...

article

Constraints on crystal storage timescales in mixed magmas: Uranium-series disequilibria in plagioclase from Holocene magmas at Mount Hood, Oregon

Gary R. Eppich, Kari M. Cooper, Adam J.R. Kent, Alison Koleszar

Earth and Planetary Science Letters > 2012 > 317-318 > Complete > 319-330

Uranium-series crystal ages, interpreted within a textural and geochemical framework, can provide insight into crystal storage timescales, especially in cases where crystals may derive from multiple sources. We report here ²³⁰ Th– ²²⁶ Ra model ages of two distinct populations of plagioclase from low silica dacites from Mount Hood, Oregon, a volcano where previous studies show that...

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Search results for: Gary R. Eppich

Uranium assay and trace element analysis of the fourth collaborative material exercise samples by the modified Davies-Gray method and the ICP-MS/OES techniques

Fall, recovery, and characterization of the Novato L6 chondrite breccia

Constraints on fallout melt glass formation from a near-surface nuclear test

Evaluation of historical beryllium abundance in soils, airborne particulates and facilities at Lawrence Livermore National Laboratory

Constraints on crystal storage timescales in mixed magmas: Uranium-series disequilibria in plagioclase from Holocene magmas at Mount Hood, Oregon

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INFONA - science communication portal

Search results for: Gary R. Eppich

Uranium assay and trace element analysis of the fourth collaborative material exercise samples by the modified Davies-Gray method and the ICP-MS/OES techniques

Fall, recovery, and characterization of the Novato L6 chondrite breccia

Constraints on fallout melt glass formation from a near-surface nuclear test

Evaluation of historical beryllium abundance in soils, airborne particulates and facilities at Lawrence Livermore National Laboratory

Constraints on crystal storage timescales in mixed magmas: Uranium-series disequilibria in plagioclase from Holocene magmas at Mount Hood, Oregon

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