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Displaying 1 - 25 of 2289

Uranium Ion Yields from Monodisperse Uranium Oxide Particles

February 24, 2016
Author(s)
Nicholas E. Sharp, John D. Fassett, David S. Simons
… et al. [2]. However, the effect of sample substrate on uranium ion production efficiency and sputtering profile has … sample utilization efficiency by analyzing mono-disperse uranium oxide microspheres deposited onto graphite and … SIMS, Nuclear Forensics, Uranium, Sample Utilization Efficiency …

Measurement of Uranium-236 in Particles by Secondary Ion Mass Spectrometry

January 12, 2017
Author(s)
David S. Simons, John D. Fassett
… abundance by secondary ion mass spectrometry of 236U in uranium-containing material is complicated by the presence of 235U1H+ ions at the same nominal mass as the uranium isotopic peak. The net intensity of the 236U signal … the amount of sample is limited, as is the case with small uranium particles that are of great interest for nuclear …

Natural Uranium Radioactivity Solution Standard: SRM 4321d

December 27, 2017
Author(s)
Ronald Colle, Lizbeth Laureano-Perez, Svetlana Nour, Jerome J. LaRosa, Brian E. Zimmerman, Leticia S. Pibida, Denis E. Bergeron
… A new natural uranium solution standard has been produced and will be … dilution analysis, Liquid scintillation (LS), Natural uranium, Standard Reference Material (SRM), Uranium-234, Uranium-235, Uranium-238 … Natural Uranium Radioactivity Solution Standard: SRM 4321d …

Improved Uranium Particle Analysis by SIMS using O3- Primary Ions

September 6, 2022
Author(s)
Evan Groopman, Todd Williamson, David S. Simons
… and O3-) to determine the benefits of using such beams for uranium particle SIMS analyses. Typically, O- is the most … negative primary ion species for both age dating and uranium isotopic analysis from the conventional duoplasmatron … investigated the effect of the molecular oxygen beams on uranium isotope mass fractionation and the Th/U relative …

Bulk-Moduli Systematics in Oxides Including Superconductors

January 5, 2001
Author(s)
H M. Ledbetter, Sudook A. Kim
… For oxides, including superconductors, we consider the … (B/V a ) relationship. For nonsuperconducting oxides, the B-V a diagram shows that most oxides fall in three sets: (1) rocksalt crystal structure, … Bulk-Moduli Systematics in Oxides Including Superconductors …

Bulk-Moduli Systematics in Oxides, Including Superconductors

January 1, 2001
Author(s)
H M. Ledbetter, Sudook A. Kim
… For oxides, including superconductors, we consider the … (B/V α ) relationship. For nonsuperconducting oxides, the B-V α diagram shows that most oxides fall in three sets: (1) rocksalt crystal structure, … Bulk-Moduli Systematics in Oxides, Including Superconductors …

Uranium removal from seawater by means of polyamide 6 fibers directly grafted with diallyl oxalate through a single-step, solvent-free irradiation process

December 4, 2015
Author(s)
Travis C. Dietz, Claire E. Tomaszewski, Zois Tsinas, Dianne L. Poster, Aaron Barkatt, Mohammad Adel-Hadadi, Fred B. Bateman, Lonnie Cumberland, Erich Schneider, Karen Gaskell, Jay LaVerne, Mohamad Al-Sheikhly
… of oxalate-based polymeric adsorbents in the recovery of uranium from seawater, diallyl oxalate (DAOx) was grafted … with actual seawater spiked with 0.2 or 1.0 mg·L−1 uranium. The fraction of uranium in the solution which was removed due to uptake on … Single-step radiation graft polymerization, uranium extraction, seawater, nylon, acrylated oxalate …

Advances in Age-Dating of Individual Uranium Particles by Large Geometry Secondary Ion Mass Spectrometry

June 10, 2019
Author(s)
Christopher Szakal, David S. Simons, John D. Fassett, Albert J. Fahey
… We present the ability to conduct single micrometer-sized uranium particle age-dating measurements on particles that … conditions that allow for this advance in single-particle uranium age dating. We introduce the use of statistics … 3.0) micrometers across enrichments ranging from natural uranium to highly-enriched uranium and on ages ranging from …

New reference materials for trace-levels of actinide elements in plutonium

January 27, 2022
Author(s)
Richard Essex, Lav Tandon, Amy Gaffney, Cole Hexel, Debbie Bostick, Lisa Colletti, Diana Decker, Casey Finstad, Joseph Giaquinito, Elmer Lujan, John Partridge, Benjamin Roach, John Rolinson, Kyle Samperton, Alice Slemmons, Khalil Spencer, Floyd Stanley, Lisa Townsend, Kerri Treinen, Ross Williams, Christopher Worley
… mass fractions of plutonium, americium, neptunium, and uranium. Isotope amount ratios were also determined for plutonium and uranium, but neptunium and americium were observed to be … with the exception of limited heterogeneity for uranium, primarily observed for the 238U isotope. Model …

Mechanisms and Measurement of Oxidative Damage to DNA

March 1, 2001
Author(s)
M. Dizdaroglu, Pawel Jaruga, H Rodriguez
… metabolism and by exogenous sources. These species cause oxidative damage to DNA and generate multiple products … are various analytical techniques for the measurement of oxidative damage to DNA with their own advantages and … between laboratories in terms of the measurement of oxidative damage to DNA. Especially, endogenous levels of DNA …

Reference lines in the optogalvanic spectra of uranium and thorium in the wavelength range 422 nm to 462 nm

June 11, 2012
Author(s)
W DeGraffenreid, Sarah C. Campbell, Craig J. Sansonetti
… The spectra of uranium and thorium are convenient sources of reference lines … operating over the wavelength range 422 nm to 462 nm. Ten uranium and eight thorium lines were measured with an … optogalvanic spectroscopy, reference wavelengths, thorium, uranium … Reference lines in the optogalvanic spectra of uranium and thorium in the wavelength range 422 nm to 462 nm …

REFERENCE MATERIALS FOR TRACE ACTINIDE CONTENT IN PLUTONIUM OXIDE

October 1, 2021
Author(s)
Richard Essex, Lav Tandon, Cole Hexel, Amy Gaffney
… to individual sample units comprised of 200 mg of oxide in robust quartz glass vials. Characterization was … constituents are homogenously distributed within the Pu oxide material. Monoisotopic Am-241 is consistent with … to be due to process related contamination of the Pu oxide or analysis blank. Monoisotopic Np-237 also appears be …

Modeling Heat and Moisture Transport in Steam-Cured Mortar: Application to AASHTO Type VI Beams

June 22, 2017
Author(s)
Emilio Hernandez-Bautista, Sadoth Sandoval-Torres, Prisciiano Cano Barrita, Dale P. Bentz
… conditions in mortar and concrete specimens of AASHTO Type VI Beams. The primary variables of the model were moisture … of the model to the steam curing of an AASHTO Type VI beam indicates thermal gradients (between the surface and … AASHTO Type VI concrete beam, heat and mass transport, hydration, …

The Infrared Spectrum of Uranium Hollow Cathode Lamps from 850 - 4000 nm: Wavenumbers & Line Identifications from FTS Spectra

August 4, 2011
Author(s)
Stephen L. Redman, James E. Lawler, Gillian Nave, Lawrence W. Ramsey, Suvrath Mahadevan
… Solar Observatory (NSO). This line list includes isolated uranium lines in the Y, J, H, K, and L bands (0.9 to 1.1 μm, … we provide enable inexpensive, commercially-available uranium hollow-cathode lamps to be used for high-precision … spectra, Fourier transform spectroscopy, near infrared, uranium, wavelengths …

Mapping Oxidative DNA Damage at Nucleotide Resolution in Mammalian Cells

October 16, 2008
Author(s)
H Rodriguez, T R. O'Connor, H H. Chen, S M. Dai, S D. Flanagan, G P. Holmquist, S A. Akman, A D. Riggs
… Oxidative Stress and Aging Journal … IMPCR, oxidative stress, reactive oxygen species, TDPCR … Mapping Oxidative DNA Damage at Nucleotide Resolution in Mammalian …

Atom Probe Mass Spectrometry of Uranium Isotopic Reference Materials

July 22, 2020
Author(s)
Frederick Meisenkothen, Mark McLean, Irina Kalish, Daniel V. Samarov, Eric B. Steel
… algorithm, we demonstrate accurate and reproducible uranium isotopic analyses, via atom probe mass spectrometry, … by Poisson counting statistics, i.e., the number of uranium atoms recorded. … isotopic analysis, uranium, multi-hit detection events, particles, atom probe, …

A new highly enriched 233U reference material for improved simultaneous determination of uranium amount and isotope amount ratios in trace level samples

January 26, 2021
Author(s)
Richard Essex, Ross W. Williams, Kayron T. Rogers, Cole R. Hexel, Tashi Parsons-Davis, Kerri C. Treinen
… as a master solution which was analyzed for molality of uranium by modified Davies and Gray titration. A portion of … units. Selected units were analyzed to characterize uranium isotope amount ratios by multi-collector inductively … couple plasma mass spectrometry and for verification of uranium content. Modelling of spike-corrected isotopic data …

Atomic Spectral Tables for the Chandra X-Ray Observatory. Part II (Si vi - Si xii)

June 1, 2004
Author(s)
Larissa Podobedova, Daniel E. Kelleher, Joseph Reader, Wolfgang L. Wiese
… probabilities are given for spectra of ionized silicon (Si VI - Si XII) in the region 25 to 170 . These tables provide … far ultraviolet, Si IX, Si VI, Si VII, Si VIII, Si XI, Si XII, silicon, soft x-rays … Tables for the Chandra X-Ray Observatory. Part II (Si vi - Si xii) …
Displaying 1 - 25 of 2289
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