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Cost-based optimizations of power density and target-blanket modularity for {sup 232}Th/{sup 233}U-based ADEP

Description: A cost-based parametric systems model is developed for an Accelerator-Driven Energy Production (ADEP) system based on a {sup 232}Th/{sup 233}U fuel cycle and a molten-salt (LiF/BeF{sub 2}/ThF{sub 3}) fluid-fuel primary system. Simplified neutron-balance, accelerator, reactor-core, chemical-processing, and balance-of-plant models are combined parametrically with a simplified costing model. The main focus of this model is to examine trade offs related to fission power density, reactor-core modula… more
Date: July 1, 1995
Creator: Krakowski, Robert A.
Partner: UNT Libraries Government Documents Department
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Power production and ADS

Description: We describe the power production process in Accelerator Driven Sub-critical systems employing Thorium-232 and Uranium-238 as fuel and examine the demands on the power of the accelerator required.
Date: March 1, 2010
Creator: Raja, Rajendran
Partner: UNT Libraries Government Documents Department
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Forecast of Standard Atomic Weights for the Mononuclidic Elements – 2011

Description: In this short report, I will provide an early warning about potential changes to the standard atomic weight values for the twenty mononuclidic and the so-called pseudo-mononuclidic ({sup 232}Th and {sup 231}Pa) chemical elements due to the estimated changes in the mass values to be published in the next Atomic Mass Tables within the next two years. There have been many new measurements of atomic masses, since the last published Atomic Mass Table. The Atomic Mass Data Center has released an unpu… more
Date: July 27, 2011
Creator: Holden, N. E.; Holden, N. & Holden, N. E.
Partner: UNT Libraries Government Documents Department
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THE CONTRIBUTION OF THE INDIVIDUAL RESONANCES TO THE RESONANCE INTEGRALS IN URANIUM AND THORIUM

Description: Information is presented in tabular form on the contributions of the individual resonances to the resonance integrals in U and Th. The cases considered are for isolated cylindrical rods and involve U/sup 238/, U/sup 238/O/ sub 2/, Th/ sup 232/, and Th/sup 232/O/sub 2/ (M.C.G.)
Date: October 26, 1961
Creator: Nordheim, L.W.
Partner: UNT Libraries Government Documents Department
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The Fission Energetics of Th$Sup 23$$Sup 2$

Description: The distribution of the kinetic energy of fragments emitted as a result of the neutron-induced fission of Th/sup 232/ has been determined. Incident neutron energies of 1475 plus or minus 35 kev and l600 plus or minus 35 kev were used. The distributions determined at the two incident neutron energies are identical. The measured total average fragment kinetic energy was l55 plus or minus 4.5 Mev. The most probable fragment mass ratio is 1.47 plus or minus 0.05, and the average kinetic energies of… more
Date: November 1, 1960
Creator: Smith, A. B.; Nobles, R. G. & Friedman, A. M.
Partner: UNT Libraries Government Documents Department
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Results of the radiological survey of the Excelsior Steel Ball Company, Tonawanda, New York (TNY005)

Description: At the request of the US Department of Energy (DOE), a team from Oak Ridge National Laboratory conducted two radiological surveys of property belonging to the Excelsior Steel Ball Company, which is surrounded on three sides by the former site of the Linde Uranium Refinery, Tonawanda, New York. The surveys were performed in September 1997 and February 1998. The purpose of the first survey was to determine if radioactive residuals were present from previous activities at the former Linde site. Th… more
Date: July 1998
Creator: McKenzie, S. P. & Brown, K. S.
Partner: UNT Libraries Government Documents Department
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Thorium in occupationally exposed men.

Description: Higher than environmental levels of {sup 232}Th have been found in autopsy samples of lungs and other organs from four former employees of a thorium refinery. Working periods of the subjects ranged from 3 to 24 years, and times from end of work to death ranged from 6 to 31 years. Examination of the distribution of thorium among the organs revealed poor agreement with the distribution calculated from the dosimetric models in Publication 30 of the International Commission on Radioprotection (ICRP… more
Date: February 24, 1999
Creator: Stehney, A. F.
Partner: UNT Libraries Government Documents Department
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The Determination Thorium Isotopic Ratios by Radiochemical Methods

Description: >A sensitive analytical method was needed to determine the total thorium content and the Th/sup 2//sup 3//sup 0/ isotopic abundance in a number of uranium ore and mill talling samples available in the United States. A procedure was developed using absolute alpha counting to determine Th/sup 2//sup 3//sup 0/ and neutron activation analysis to determine Th/sup 2//sup 3//sup 2/. The method is highly specific with a sensitivity on the order of 10/sup -//sup 1//sup 0/ grams for either isotope and wa… more
Date: January 1, 1960
Creator: Matsumoto, W. Y.
Partner: UNT Libraries Government Documents Department
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A PROGRAM OF RESEARCH AND CALCULATIONS OF RESONANCE ABSORPTION. Final Report

Description: A direct numerical integration of the integral equation for the average collision density in the absorber was previously suggested in a discussion of resonance absorption. The implementation of this program is considered. The method of calculation, comparison with experimental data, and the computer code developed are described. The method of integration, computation of cross sections, selection of mesh size, integration interval, outside correction, the Dancoff correction, and unresolved reson… more
Date: August 28, 1961
Creator: Nordheim, L.W.
Partner: UNT Libraries Government Documents Department
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Health Physics Considerations for Remediation and Exposure Monitoring of a Th-232 Waste Stream in a Commercially Active Environment

Description: This paper discusses some of the unique regulatory conditions and operational challenges facing a team performing a thorium-232 cleanup in a commercially active environment, as well as the implemented and proposed solutions that can be applied to other programs, particularly those operating in an OSHA-regulated environment.
Date: February 27, 2003
Creator: Winters, Michael S. & Hays, David C. Jr.
Partner: UNT Libraries Government Documents Department
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Analysis Of Activation Measurements Of Th$sup 232$ Resonance Captures In The Peach Bottom (40-MW(E) Prototype HTGR) Critical Assembly

Description: Measurements of thorium resonance-capture activations relative to those of Au/sup 197/, which were made in the Peach Bottom (HTGR) critical assembly, are analyzed and compared with thorium resonance activations calculated from tabulated values of the resonance parameters. The new vanadium-subtraction method that was applied is shown to measure thorium resonance captures relative to those of Au/sup 197/ to within several per cent in this geometry. The measurements show that the lowest several re… more
Date: September 14, 1962
Creator: Sampson, J. B.
Partner: UNT Libraries Government Documents Department
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A new look at positron production from heavy-ion collisions: Results from apex

Description: A new solenoidal spectrometer, designed to study the production mechanism of electrons and positrons in heavy-ion collisions, has been constructed at Argonne National Laboratory. The spectrometer has been used to study the {sup 238}U + {sup 181}Ta system at 5.95, 6.10, and 6.30 MeV/u and the {sup 238}U + {sup 232}Th system at 5.95 MeV/u. These bombarding energies cover the energy region where previous experiments have reported sharp sum-energy lines. No evidence is found for sharp peaks in the … more
Date: December 31, 1995
Creator: Ahmad, I.; Back, B. B. & Austin, S. M.
Partner: UNT Libraries Government Documents Department
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New results from Los Alamos in the study of parity violation in neutron P-resonances

Description: The TRIPLE collaboration has made major improvements in our experimental apparatus with a new polarizing spin filter, larger beam size, and new detectors. The result of these improvements is a factor of 20 improvement in the experimental uncertainty that can be obtained in a given running time. We have obtained improved data on {sup 232}Th and {sup 238}U, as well as new data on {sup 113}Cd, In, Ag, and Nb. The sign effect previously observed in {sup 232}Th has been reproduced, but other nuclei … more
Date: August 1, 1994
Creator: Seestrom, S. J.; Alde, D.; Bowman, J. D.; Frankle, C. M.; Green, A. A.; Crawford, B. E. et al.
Partner: UNT Libraries Government Documents Department
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