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Estimation of Small Quantities of Uranium in Thorium

Description: Abstract: "Estimation of the intensity of the uranyl fluorescence furnishes a method for the determination of quantities of uranium as low as one-half microgram of uranium in one-half illilitor of glassy phosphoric acid. The test has been used to detect directly three parts of uranium in one million parts of thorium" (p. 1).
Date: 1946
Creator: Weissman, S. I. & Duffield, R. B.
Partner: UNT Libraries Government Documents Department

A Conceptual Design of a Thorium-Uranium (233) Power Breeder Reactor

Description: From abstract: A conceptual design study has been performed for a sodium cooled, graphite moderated, thermal power-breeder reactor utilizing the Thorium-Uranium 233 breeding cycle. Several aspects of the design of the system are considered but no attempt has been made to supply all the details. It appears that the design presented is feasible and will allow the production of economic power as well as full utilization of thorium resources.
Date: February 1, 1954
Creator: Henrie, J. O. & Weisner, E. F.
Partner: UNT Libraries Government Documents Department

New Description of Thorium Spectra

Description: Report discussing wavelengths and estimated intensities in electrodeless lamp and spark sources presented for 15121 lines of ThI, ThII, ThIII, and ThIV in the spectral range from 2000 to 11550 A. Also contains tables of previously published interferometric values.
Date: June 21, 1960
Creator: Zalubas, Romuald
Partner: UNT Libraries Government Documents Department

Genesis of the Bokan Mountain, Alaska Uranium-Thorium Deposit

Description: From preface: This study was funded by the Department of Energy through Bendix Field Engineering Corporation subcontract 78-245-E dated September 20, 1978. The project is part of the National Uranium Resource Evaluation (NUBE) Program conducted by Bendix for the Department of Energy and is specifically part of an effort to geologically define and explain the significant occurrences of uranium throughout the world.
Date: January 1980
Creator: Thompson, Tommy B.; Lyttle, Thomas & Pierson, John R.
Partner: UNT Libraries Government Documents Department

[Wyoming Uranium Evaluation] Volume 3: Uranium Assessment for the Precambrian Pebble Conglomerates in Southeastern Wyoming

Description: From introduction: The Geology Department of the University of Wyoming was asked to make a geostatistical assessment of the uranium endowment of these deposits as a part of the World Class core drilling operations of the Bendix Field Engineering Corporation. This study was to include (a) the development of optimum geostatistical methodology for assessing uranium endowment in areas of close drill control (1 mile or less centers) as well as in areas of distant drill control (5 mile centers or more), (.b) the implementation of this methodology in assessing the uranium resources of the pebble conglomerates in southeastern Wyoming, and (c) the determination of the overall geostatistical uncertainty of the resource estimates. In addition, methods were to be studied for projecting the assessments into new areas, including prediction of estimate uncertainty.
Date: March 1981
Creator: Borgman, Leon E.; Sever, Cassandra K.; Quimby, William F.; Andrew, Michael E.; Houston, Robert S. & Karlstrom, Karl E.
Partner: UNT Libraries Government Documents Department

Thorium Uranium Physics Experiments: Final Report

Description: Report concerning the "study of uniform lattice cores moderate with light water" (p. xiii) and comparing the measurements with various theoretical models. Includes descriptions of the cores, core measurements, leakage experiments, and calculations.
Date: May 1960
Creator: Snidow, N. L.; Anderson, R. C.; Batch, M. L.; deCoulon, G. A. G.; Lewis, R. H. & Vannoy, W. M.
Partner: UNT Libraries Government Documents Department

The Geological Survey's Work on the Geology of Uranium and Thorium Deposits

Description: From abstract: The Geological Survey has been studying the geology of uranium and thorium continuously since 1939, when it began a comprehensive investigation of the vanadium-uranium deposits of the Colorado Plateau. Greatly increased demand for uranium arising from the advent of controlled fission in 1942 resulted in widening of the study in 1944 to include other possible sources and in further expansion on behalf of the U. S. Atomic Energy Commission since 1947. The wide variety of materials investigated in this study are embraced by five somewhat arbitrary groups of related types of deposits as follows: (1) Igneous rocks, pegmatites, veins, and related deposits; (2) Deposits in sandstone of carnotite, copper-uranium, and other minerals; (3) Other consolidated sedimentary rocks; (4) Placers; and (5) Natural fluids.
Date: 1952
Creator: Butler, Arthur P., Jr.
Partner: UNT Libraries Government Documents Department

PREPARATION OF THORIUM OXIDE FROM ORNL THOREX THORIUM NITRATE

Description: Thorium nitrate, removed from irradiated Th metal processed in the Thorex pilot plant, was converted to the oxide and then to the fluoride in one pilot-plant-scale and two laboratory-scale runs. Activity distributions, decontamination factors, and safety of the process are treated. (D.L.C.)
Date: February 13, 1957
Creator: McDuffee, W.T. & Yarbro, O.O.
Partner: UNT Libraries Government Documents Department

Thorium and Uranium M-shell X-ray Production Cross Sections for 0.4 – 4.0 MeV Protons, 0.4 - 6.0 MeV Helium Ions, 4.5 – 11.3 MeV Carbon Ions, and 4.5 – 13.5 MeV Oxygen Ions.

Description: The M-shell x-ray production cross section for thorium and uranium have been determined for protons of energy 0.4 - 4.0 MeV, helium ions of energy 0.4 - 6.0 MeV, carbon ions of energy 4.5 - 11.3 MeV and oxygen ions of energy 4.5 - 13.5 MeV. The total cross sections and the cross sections for individual x-ray peaks in the spectrum, consisting of the following transitions Mz (M4-N2, M5-N3, M4-N3), Ma (M5-N6,7), Mb (M4-N6, M5-O3, M4- O2), and Mg (M4-O3, M5-P3, M3-N4, M3-N5), were compared to the theoretical values determined from the PWBA + OBKN and ECUSAR. The theoretical values for the carbon and oxygen ions were also modified to take into account the effects of multiple ionizations of the target atom by the heavier ions. It is shown that the results of the ECUSAR theory tend to provide better agreement with the experimental data.
Date: May 2011
Creator: Phinney, Lucas C.
Partner: UNT Libraries

Alternative Fuel Cycle Options : Performance Characteristics and Impact on Nuclear Power Growth Potential

Description: The fuel utilization characteristics for LWR, SSCR, CANDU and LMFBR reactor concepts are quantified for various fuel cycle options, including once-through cycles, thorium cycles, and denatured cycles. The implications of various alternative reactor deployment strategies on the long-term nuclear power growth potential are then quantified in terms of the maximum nuclear capacity that can be achieved and the growth pattern over time, subject to the constraint of a fixed uranium-resource base. The overall objective of this study is to shed light on any large differences in the long-term potential that exist between various alternative reactor/fuel cycle deployment strategies.
Date: September 1977
Creator: Chang, Y. I.; Till, C. E.; Rudolph, R. R.; Deen, J. R. & King, M. J.
Partner: UNT Libraries Government Documents Department

The Formation of U232 by Helium Ions of Thorium

Description: The production of U{sup 232} by the sum of {alpha},4n and {alpha},p 3n reactions on thorium has been studied. The cross section at an average energy of 37.5 Mev was 0.013 barns and the threshold for the reaction was about 30 Mev.
Date: April 14, 1948
Creator: Newton, Amos S.
Partner: UNT Libraries Government Documents Department

Solvent extraction study of the thorium nitrate, nitric acid, and tributyl phosphate-dodecane system: density and acidity relationships

Description: A solvent extraction study to determine equilibrium conditions of thorium nitrate-nitric acid with 30% tributyl phosphate in normal dodecane has been completed. Experimental conditions studied were 30 to 60{sup 0}C, 0.05 to 1.5 M Th(NO{sub 3}){sub 4}, and 0.0 to 3.0 M HNO{sub 3}. The extractant concentration was constant at 30% tributyl phosphate. The equilibrium experiments have produced data which demonstrate that thorium nitrate concentration, free acid, and density are related in equilibrium behavior between the aqueous and organic phases from 30 to 60{sup 0}C in the 30% tributyl phosphate-dodecane solvent extraction system. The concentration interactions apply to both the two- and three-phase regions. A linear correlation was observed for the density (D) of the aqueous or organic phase and the concentration of thorium and free acid. The general form of the equation is D = a(C/sub Th/ + bC/sub H/) + c, where a is the slope, b is the constant, c is the intercept, and C/sub Th/ and C/sub H/ are the molar concentrations of thorium and free acid respectively. The relationship of temperature, thorium nitrate, and free acid makes possible the definitions of the boundaries between the two- and three-phase regions. This dependence, in turn, permits operational control or simulation studies of the system within the two-phase region. The data demonstrate the interactions of the components of the Thorex system and can be used to improve the mathematical description of equilibrium in the SEPHIS-Thorex computer program.
Date: May 1, 1980
Creator: Weinberger, A.J.; Marley, J.L. & Costanzo, D.A.
Partner: UNT Libraries Government Documents Department

Thorium and Rare-Earth Minerals in Powderhorn District, Gunnison County, Colorado

Description: From abstract: Thorium has been found since 1949 in at least 33 deposits in an area 6 miles wide and 20 miles long in the Powderhorn district, Gunnison County, Colo. The district is underlain largely by pre-Jurassic metamorphic and igneous rocks, most of which, if not all, are pre-Cambrian in age. These rocks are overlain by sandstone of the Morrison formation of Jurassic age, and by volcanic rocks of the Alboroto group and the Hinsdale formation of Miocene and of Pliocene(?) age, respectively.
Date: 1956
Creator: Olson, J. C. & Wallace, S. R.
Partner: UNT Libraries Government Documents Department

Preliminary Report on 1952 Field Investigations in Wet Mountains, Colorado

Description: From page 3: A metallogenic province containing thorium in veins in pre-Cambrian rocks along the western slope of the Wet Mountains, Colo. found by the Reconnaissance Group of the U. S. Geological Survey during the summer of 1950,was revealed by the discovery during fiscal-years 1951-1952 of seventeen radioactive deposits scattered along a north-northwest linear distance of twenty miles. All the thorium occurrences were found within terrain that has never been geologically mapped. Three of the most promising localities were mapped at 1:1,200, and a diamond-drilling program was conducted at Haputa ranch.
Date: 1953
Creator: Singewald, Q. D.; Christman, Robert A. & Brock, M. R.
Partner: UNT Libraries Government Documents Department

RADIOACTIVITY OF THORIUM AND FEASIBILITY OF IN VIVO THORIUM MEASUREMENTS

Description: Tabulations of the radioactivity in the thorium series decay chain and a discussion of the radioactivity variations possible in non-equllibrium conditions of the decay chain are presented. Experimental data indicate that the daughters of thorium within the human lung may be measured by in vivo gamma spectrometry and related to Th/sup 232/ content for thorium quantities as small as 9 mug, if the activity ratio of Th/sup 232/: Th/sup 228/ is knowu for the deposited material. Two crystel gamma coincidence measurements of pairs of the simultaneously emitted gamma quanta from the daughters are suggested as a promising approach to thorium in vivo measurements. (auth)
Date: November 11, 1959
Creator: Cofield, R.E.
Partner: UNT Libraries Government Documents Department

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 was found to give reliable data for the various sample types of interest. (auth)
Date: January 1, 1960
Creator: Matsumoto, W.Y.
Partner: UNT Libraries Government Documents Department