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Impurity Diffusion As A Possible Metal Chronometer For Pre-Detonation Nuclear Forensics, Edward T. Peskie, Howard L. Hall 2015 United States Military Academy

Impurity Diffusion As A Possible Metal Chronometer For Pre-Detonation Nuclear Forensics, Edward T. Peskie, Howard L. Hall

International Journal of Nuclear Security

The ability to determine the time since forming of seized nuclear material would provide crucial data to be used in its investigation. The time dependent processes of diffusion relevant to this need are examined; to include grain boundary diffusion, and discontinuous precipitation, and an assessment is performed of the utility of examination of impurity and alloying element concentration profiles for use as a pre-detonation nuclear forensics tool for determining the age of a metal sample. Several examples illustrate the effects of time on both binary alloys and multi-component systems. Parallels are drawn from studies of diffusion in mineral samples under ...


Radiation Damage As A Possible Metal Chronometer For Pre-Detonation Nuclear Forensics, Edward T. Peskie, Howard L. Hall 2015 United States Military Academy

Radiation Damage As A Possible Metal Chronometer For Pre-Detonation Nuclear Forensics, Edward T. Peskie, Howard L. Hall

International Journal of Nuclear Security

The ability to determine the time since the forming of seized nuclear material would provide crucial data to be used in its investigation. This paper examines the effects of radiolytic damage caused by the decay of uranium isotopes and assesses the potential forensic utility of examination of these damage regions for determining the time since forming of a metal sample. This paper draws parallels from studies of fission track dating in mineral samples under geologic time and proposes modifications to previously published work in the field of α-recoil track dating in order to determine the time since a metal sample ...


Cover, 2015 University of Tennessee, Knoxville

Cover

International Journal of Nuclear Security

No abstract provided.


Masthead, 2015 University of Tennessee, Knoxville

Masthead

International Journal of Nuclear Security

No abstract provided.


From The Editor, 2015 University of Tennessee, Knoxville

From The Editor

International Journal of Nuclear Security

No abstract provided.


Student Writing Competition, 2015 University of Tennessee, Knoxville

Student Writing Competition

International Journal of Nuclear Security

No abstract provided.


Characterizing Groundwater Ch4 And 222rn In Relation To Hydraulic Fracturing And Other Environmental Processes In Letcher County, Ky, St. Thomas Majeau LeDoux 2015 University of Tennessee - Knoxville

Characterizing Groundwater Ch4 And 222rn In Relation To Hydraulic Fracturing And Other Environmental Processes In Letcher County, Ky, St. Thomas Majeau Ledoux

Masters Theses

Hydraulic fracturing of shale deposits has greatly increased the productivity of the natural gas industry by allowing it to exploit previously inaccessible reservoirs. However, previous research has demonstrated that this practice can contaminate shallow aquifers with CH4 [methane] from deeper formations. This study compares concentrations and isotope compositions of CH4 sampled from domestic groundwater wells in Letcher County, Kentucky in order to characterize its occurrence and origins in relation to neighboring hydraulically fractured natural gas wells. Additionally, this study tests the reliability of 222Rn [radon] as an alternative tracer to CH4 in identifying processes of gas ...


Green Chemistry As A Tool For Understanding The Toxic Substances Control Act: A Lecture Module For Undergraduate Students, Molly R. Blessing 2015 University of Connecticut - Storrs

Green Chemistry As A Tool For Understanding The Toxic Substances Control Act: A Lecture Module For Undergraduate Students, Molly R. Blessing

Honors Scholar Theses

The Toxic Substances Control Act (TSCA) is the central form of chemical regulation existent in the United States today, yet scientists are often unaware or uncertain of its provisions. Violations of TSCA by unknowing chemists set industry and government unnecessarily at odds. A lecture on TSCA was developed for undergraduate students that uses the concept of green chemistry to promote interest and incentivize learning. Green chemistry methods are cleaner and less wasteful than traditional chemical ones, and many companies using them are at the forefront of technological innovation. The lecture explains both green chemistry and TSCA, includes company case studies ...


Synthesis And Characterization Of Ln[Hfac]X And Ln[Fod]X Complexes For Thermochromatographic Separations, Matthew L. Marsh 2014 University of Tennessee - Knoxville

Synthesis And Characterization Of Ln[Hfac]X And Ln[Fod]X Complexes For Thermochromatographic Separations, Matthew L. Marsh

University of Tennessee Honors Thesis Projects

No abstract provided.


Simultaneous Determination Of Multiple Actinide Elements In A Variety Of Soils Utilizing A Standardized Sequential Extraction Protocol, Sherry Alina Faye 2014 University of Nevada, Las Vegas

Simultaneous Determination Of Multiple Actinide Elements In A Variety Of Soils Utilizing A Standardized Sequential Extraction Protocol, Sherry Alina Faye

UNLV Theses/Dissertations/Professional Papers/Capstones

To obtain a better understanding of the mobility of actinide element contaminants in the environment, the association of the contaminants with specific host phases of soils and sediments must be investigated. This investigation is most commonly conducted using sequential extraction techniques that employ the selective dissolution of soil phases with increasingly aggressive chemical treatment. Though several sequential extraction studies exist in literature, conclusions cannot be made by direct comparison of data due to the lack of uniformity in the protocols used. This work aims to continue development of a standard sequential extraction protocol and expanding its capabilities to include the ...


Technetium Sulfide: Fundamental Chemistry For Waste Storage Form's Application, Maryline Ghislaine Ferrier 2014 University of Nevada, Las Vegas

Technetium Sulfide: Fundamental Chemistry For Waste Storage Form's Application, Maryline Ghislaine Ferrier

UNLV Theses/Dissertations/Professional Papers/Capstones

Technetium is the lightest radioelement. The isotope 99Tc has around a 6% yield from 235U with a half-life of 2.13 x 105 years. The high mobility of TcO4-, the common chemical form of technetium in the environment makes 99Tc an isotope of concern in nuclear waste management. Despite its important role in radiopharmaceuticals and in the nuclear fuel cycle, the fundamental chemistry of technetium is not as well developed as that of the neighboring transition metals; one of the most striking examples being its sulfide chemistry.

Only two technetium binary sulfide compounds had been ...


Effect Of Gamma Radiation On The Interfacial Reactions And Transfer Processes Of Phosphonium-Based Ionic Liquids With Carbon Steel, Ryan P. Morco 2014 The University of Western Ontario

Effect Of Gamma Radiation On The Interfacial Reactions And Transfer Processes Of Phosphonium-Based Ionic Liquids With Carbon Steel, Ryan P. Morco

University of Western Ontario - Electronic Thesis and Dissertation Repository

This thesis presents work on the effects of ionizing radiation on phosphonium-based ionic liquids (ILs). Ionic liquids are known for their tunable properties which make them attractive options for applications for the separation and sequestration of metal ions from spent nuclear fuels, and candidate lubricants for systems under severe conditions. The high radiation environment found in spent fuel processing may decompose the solvents (ILs) used in the process and affect their separation efficiency. The radiolytic decomposition products can also alter the physical and chemical properties of an IL in ways which can affect the potential corrosion of metal alloys in ...


The Development Of Metal-Organic Compounds For Use As Molecular Imaging Agents, Emily J. Simpson 2014 The University of Western Ontario

The Development Of Metal-Organic Compounds For Use As Molecular Imaging Agents, Emily J. Simpson

University of Western Ontario - Electronic Thesis and Dissertation Repository

Molecular imaging probes allow for the non-invasive diagnosis of many diseases through the use of a targeting entity for site specific delivery, as well as a signal for external visualization of probe accumulation in the body. This thesis will focus on the development of new approaches to synthesize targeting peptides and chelators for radionuclide incorporation towards the design of novel molecular imaging probes.

Histidine is a tridentate chelator that can be attached in a pendant fashion to a biomolecule in order to coordinate technetium-99m. Once coordinated, it forms a neutral complex that is capable of forming diastereomers with inverted stereochemistry ...


Development Of A Gallium-Containing One-Bead One-Compound Peptide Library For The Discovery Of New Molecular Imaging Probes, Fernanda C. Bononi 2014 The University of Western Ontario

Development Of A Gallium-Containing One-Bead One-Compound Peptide Library For The Discovery Of New Molecular Imaging Probes, Fernanda C. Bononi

University of Western Ontario - Electronic Thesis and Dissertation Repository

An eight amino acid one-bead one-compound (OBOC) peptide library, containing a gallium-DOTA complex, was developed in an attempt to overcome common issues associated with the later addition of radionuclides to peptide chains of imaging probes. The further addition of a radionuclide often changes the binding properties of a peptide, as it adds bulk, and possibly charges. MALDI (matrix-assisted laser desorption ionization) tandem mass spectrometry was determined to be the method of choice in order to deconvolute gallium-containing peptide sequences. The library obtained was screened against the breast cancer cell lines MDA-MB-231 and MCF-7. Positive beads were isolated and sequences were ...


Thin Films Cds/Cdte Diodes For Nuclear Radiation Detection, Julianna Calkins, John Murphy, Lindsey Smith, Israel Mejia, Bruce Gnade, Manuel Quevedo-Lopez 2014 Stephen F Austin State University

Thin Films Cds/Cdte Diodes For Nuclear Radiation Detection, Julianna Calkins, John Murphy, Lindsey Smith, Israel Mejia, Bruce Gnade, Manuel Quevedo-Lopez

Undergraduate Research Conference

No abstract provided.


Speciation Behavior Of Americium Higher Oxidation States For The Separation Of Americium From Curium, Catherine Lynn Riddle 2014 University of Nevada, Las Vegas

Speciation Behavior Of Americium Higher Oxidation States For The Separation Of Americium From Curium, Catherine Lynn Riddle

UNLV Theses/Dissertations/Professional Papers/Capstones

Several countries are currently expanding the use of nuclear energy as a method for the safe generation of carbon free energy and a number are evaluating starting up a nuclear power program. Closed fuel cycle technologies may be key to waste reduction and a sustainable nuclear energy future and to support the development of more efficient fuel cycles, the investigation of the chemical properties of key actinides is at the forefront of separations research. In this work the characterization of higher oxidation states of americium (Am) has been performed using spectroscopic methods. Americium in the formal oxidation state of Am ...


Syntheses Of Precursors To Fluorine-18 Labeled Pet Imaging Agents, Lindsay B. Boling 2014 University of Tennessee - Knoxville

Syntheses Of Precursors To Fluorine-18 Labeled Pet Imaging Agents, Lindsay B. Boling

University of Tennessee Honors Thesis Projects

No abstract provided.


Binary Technetium Halides, Erik Vaughan Johnstone 2014 University of Nevada, Las Vegas

Binary Technetium Halides, Erik Vaughan Johnstone

UNLV Theses/Dissertations/Professional Papers/Capstones

In this work, the synthetic and coordination chemistry as well as the physico-chemical properties of binary technetium (Tc) chlorides, bromides, and iodides were investigated. Resulting from these studies was the discovery of five new binary Tc halide phases: α/β-TcCl3, α/β-TcCl2, and TcI3, and the reinvestigation of the chemistries of TcBr3 and TcX4 (X = Cl, Br). Prior to 2009, the chemistry of binary Tc halides was poorly studied and defined by only three compounds, i.e., TcF6, TcF5, and TcCl4. Today, ten phases are known (i.e., TcF6, TcF5 ...


Characterization And Optimization Of Extraction Chromatography Resins For Rapid Separations For Safeguard And Nuclear Forensics Purposes, Audrey Roman 2014 University of Nevada, Las Vegas

Characterization And Optimization Of Extraction Chromatography Resins For Rapid Separations For Safeguard And Nuclear Forensics Purposes, Audrey Roman

UNLV Theses/Dissertations/Professional Papers/Capstones

In this work, extraction chromatography resins, DGA and UTEVA, were characterized under various conditions in order to identify novel rapid separations for safeguards and nuclear forensic purposes. For safeguards purposes, mixed matrices containing some of the largest components found in used fuel and either Am, Pu, or U were characterized on DGA and UTEVA resins in order to determine any effects from the addition of these constituents. Results indicated that 5 M HNO3 would be an optimal loading condition due to the consistent actinide adsorption in the presence of the additional used fuel components. Investigations of varying the anion ...


Radiopharmaceuticals: The Application Of Technetium-99m And Rhenium Complexes, Angela Kristin Binion 2014 Syracuse University

Radiopharmaceuticals: The Application Of Technetium-99m And Rhenium Complexes, Angela Kristin Binion

Syracuse University Honors Program Capstone Projects

Nuclear imaging used in diagnostic medicine requires the use of radiopharmaceuticals to make biological areas visible under a gamma camera. Although much success has been found in the use of technetium based imaging agents, their corresponding rhenium complexes can provide insight into the chemical properties of these radiopharmaceuticals without the potentially damaging effects of radiation. Technetium and rhenium complexes utilize a bifunctional chelator to act as a linker between biological vectors and the metal, improving the coordination between the two. Ligands containing thiazole rings have been successfully coordinated to technetium or rhenium tricarbonyl complexes, although it is uncertain whether coordination ...


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