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Showing 1 to 20 of 36 for “"radioactive decay"”.
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Doubly Ionized K-Shell Following Radioactive Decay
Submitted by Carly Hafner (chafner2@illinois.edu) on 2013-09-27T22:43:13Z No. of bitstreams: 1 4183_0001.pdf: 17459179 bytes, checksum: a3c908d3c1647fbfe6831ab308b1be26 (MD5)
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The Radioactive Decay of Y87 and Sr87
U of I Only
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Resolution of composite radioactive decay curves by Fourier decay analysis
Call number: LD2668 .T4 1978 J69
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Resolution of composite radioactive decay curves by Fourier decay analysis
Call number: LD2668 .T4 1978 J69
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Tritium Plume Dynamics in the Shallow Unsaturated Zone Adjacent to an Arid Waste-Disposal Facility, Amargosa Desert Research Site, Nevada
… adjacent to a closed, commercial low-level radioactive waste disposal facility. Wastes were disposed at the facility from 1962-92. Tritium has moved long distances (> 400 m) through a shallow (1-2-m depth) dry gravelly layer--orders of magnitude further than predicted by standard transport …
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Chemical abundance analysis of HE 2324-0215, an r-process-enhanced metal-poor star
… we derived the age of the star by the means of radioactive decay, resulting in the age of 13.0 ± 1.0 Gyr. The age and the metallicity of the star suggest that HE 2324-0215 formed in a dwarf galaxy which was later accreted and became part of the Milky Way.
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Variance reduction for Poisson and Markov jump processes
… models including an emissions process and radioactive decay. These algorithms apply several variance reduction techniques to the generation of Poisson variates in the tau-leaping time-stepping method for Markov processes. Both antithetical and stratified sampling variance-reduction …
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Dual Neutral Particle Beam Interrogation of Intermodal Shipping Containers for Special Nuclear Material
… is the creation of fragments that undergo radioactive decay over a time period on the order of tens of seconds after the initial event. The delayed' gamma-rays emitted from these fragments over this period are considered a hallmark for the presence of SNM. A fundamental model is developed …
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Garnet-biotite thermometry, garnet-aluminum silicate-silica-plagioclase barometry, and Emp monazite geochronology of the early Proterozoic Ivanpah Mountains, eastern Mojave Desert, Se California
… Microprobe Analysis on monazite, using U-Th-Pb radioactive decay, suggest metamorphism occurred between 1752 +/- 86 Ma and 1689 +/- 34 Ma, similar to the age of the Yavapai terrane (∼1.70--1.69 Ma). These ages are constrained from six monazite grains included in three large garnets …
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Replenishment prioritization of highly perishable goods : a case study on nuclear medicine
… goods that is subject to rapid, but predictable radioactive decay. This study examines the viability of differentiating service through segmenting customers in Tyco Healthcare's (THC's) nuclear medicine supply chain. More specifically, the network of pharmacies that THC serves is divided into two …
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Criticality and thermal analyses of separated actinides in transmutation
… also generate a significant amount of heat by radioactive decay. If kilogram quantities are stored in a container, for example, the material may heat to an equilibrium temperature that exceeds its melting temperature. The heat generation of curium and americium present even more restriction on …
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Modeling and Design of Betavoltaic Batteries
… nuclear battery that harvests beta emitting radioactive decay energy using semiconductors. The literature results suggest that a better model is needed to design a betavoltaic battery. This dissertation creates a comprehensive model that includes all of the important factors that impact …
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BETA DECAY STUDIES AS A TOOL TO INVESTIGATE NUCLEAR STRUCTURE IN THE N-RICH PO-FR REGION AND IN P-RICH CD ISOTOPES
Beta decay is the most common form of radioactive decay, occurring in isotopes of all known elements along the nuclear chart. This makes it a formidable tool to probe the internal structure of nuclei both on the proton- and neutron-rich exotic nuclei, at the limit of the existence of the nucleus. …
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Investigation of tritium atom exchange in plastic liquid scintillation vials
… tritium activity not attributed to the natural radioactive decay. Several explanations have been offered through past literatures including diffusion, LSC cocktail degradation, and change in quenching effects. Another possible explanation for the decrease in activity is that tritium may have …
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Polonium-210 radioactivity in Lake Mead fish
… of polonium are useful because the man-made radioactive plutonium is also a heavy metal with very similar energy of alpha particle emission during radioactive decay; This study was directed toward determining the radioactivity levels of {dollar}\sp{210}{dollar}Po in Lake Mead fish, …
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Development of a MeVVA based beryllium-7 plasma source
… 7-Be is a peculiar isotope due to its varying radioactive decay half-life in different electro-chemical configurations. It is also found in an unexpected abundance at high altitudes of the Earth's atmosphere. It is possible ioniziation affects the radioactivity of the isotope, partly explaining …
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Transients in the errorbox of GW190814
… emission was due to a kilonova powered by the radioactive decay of r-process material produced during the merger. For the first time short gamma-ray bursts were convincingly linked to BNS mergers, as observed in GRB170817A [3]. The third LVC observing run (O3) began 2019 April 1 and concluded …
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Seedless Extractors
… harvested from nature (e.g., atmospheric noise, radioactive decay, other quantum phenomena) rarely looks so pure. This motivates the study of randomness extractors, which are deterministic algorithms that convert weak sources of randomness into uniformly random bits. The study of extractors dates …
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Constraining North Atlantic circulation with transient tracer observations
… input histories, sampling distributions, and radioactive decay constants, shows that by adjusting only initial-boundary conditions of CFCs and tritium, a 1⁰ x 1⁰ offline model and the transient tracer data can be brought into near-consistency, in the domain between 4.5⁰S and 39.5⁰N of the …
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