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Showing 1 to 20 of 122 for “"thorium"”.
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Superconductivity of thorium hydrides and thorium deuterides
… we have tested the superconductivity of thorium hydrides and found that Th4 H15 is a superconductor with a transition temperature near 8K, Measurements of the diamagnetic susceptibility of 24 thorium hydride and thorium deuteride samples of various compositions have been made to determine …
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Colloidal interactions of thorium
… study attempted to determine the interactions of thorium with colloidal humic acid and colloidal silica under various aqueous conditions and organic carbon from Blue point, Muddy, and Rogers Springs. A colloidal distribution study was done in spiked Lake Tahoe and Mono Lake samples. Plutonium was …
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Critical assessment of thorium reactor technology
Thorium-based fuels for nuclear reactors are being considered for use with current and future designs in both large and small-scale energy production. Thorium-232 is as abundant on Earth as lead, far more common than all isotopes of uranium, leading to its greatly reduced cost. Thorium itself …
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The marine geochemistry of thorium and protactinium
Suspended particulate matter was collected by sediment traps deployed in the Sargasso Sea (Site S2), the north equatorial Atlantic (Site E), the north equatorial Pacific (Site P), and the Panama Basin (STIE Site). Additional samples of suspended particles were obtained by in situ filtration at Site …
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The marine geochemistry of thorium and protactinium
Thesis (Ph.D.)--Massachusetts Institute of Technology, Dept. of Earth and Planetary Sciences, 1981.
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THORIUM SPECIATION IN SYNTHETIC ANHYDRITE, PLACER ILMENITE CONCENTRATE, AND TITANIA SLAG: IMPLICATIONS FOR THORIUM GEOCHEMICAL BEHAVIOR, SEQUESTRATION, AND BENEFICIATION
Understanding thorium speciation and distribution in ore minerals and related materials is of critical importance so that the thorium fuel cycle can be sourced as byproducts from metallurgical processes. The objective of this dissertation is to study thorium-bearing species in selected ore minerals …
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Trapping, laser cooling, and spectroscopy of Thorium IV
Application of precision laser spectroscopy and optical clock technology to the ground and metastable, first excited state of the ²²⁹Th nucleus at < 10 eV has significant potential for use in optical frequency metrology and tests of variation of fundamental constants. This work is a report on the …
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Electronic and lattice vibrational properties of thorium hydrides
The low temperature heat capacities of several bulk samples of Th4H15 and Th4D15 have been measured in the normal state over the temperature range from 1.4 to 20 K. Values of the electronic heat capacity coefficient, y, and the Debye temperature, eD' have been determined. No isotope effect upon the …
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Experimental approaches for the production of thorium-229
… is to produce more of the parent radioisotope, thorium-229 (t1/2=7932 years.) The two methods of production we chose to investigate are 1) the irradiation of a 226Ra target in the High Flux Isotope Reactor (HFIR) at Oak Ridge National Laboratory (ORNL) and 2) the fast neutron irradiation of a …
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Self-protection analysis of denatured thorium-plutonium fuel
… previous research has examined the use of thorium-plutonium mixedoxide fuel as a potential candidate for this high-burnup goal. Though the neutronics studies have looked upon this fuel type favorably, the purpose of this paper is to investigate the self-protection capabilities of this fuel …
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Initiating Event Analysis of a Lithium Fluoride Thorium Reactor
… Initiating Event Analysis for a Lithium Fluoride Thorium Reactor (LFTR) as the first step of a Probabilistic Safety Assessment (PSA). The major objective of the research is to compile a list of key initiating events capable of resulting in failure of safety systems and release of radioactive …
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The thorium benzyne and the cerium(IV)-nitrogen bond
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Chemistry, 1995.
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Kinetic energy release in photofission of uranium and thorium.
Massachusetts Institute of Technology. Dept. of Chemistry. Thesis. 1965. Ph.D.
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Thorium oxide dissolution kinetics for hydroxide and carbonate complexation
In order to better understand the behavior of thorium breeder reactor fuel in a repository environment, the behavior of thorium oxide was investigated. The kinetics of crystalline thorium oxide dissolution were studied under argon and argon/10% CO2 over a broad pH range in 0.1 M ionic strength …
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Measurement and modelling of uranium and thorium in natural waters
Uranium and thorium are the only elements in the actinide series which naturally occur in the environment in sufficient amounts for practical extraction. They are both radiotoxic and chemotoxic to humans due to the effects of the ionising radiation produced by their radioactive decay, the decay of …
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