UNT Libraries Government Documents Department - 143 Matching Results

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Pile Kinetics

Description: From abstract: "A pile will run steadily at an arbitrary level if it is just critical. For a pile not at equilibrium, equations of motion can be set up that contain as variables the pile power, the number of delayed neutron emitters and, in case it is of importance, also the pile temperature. The coefficients will depend on the average lifetime of the neutrons in the pile, the fractions and periods of delayed neutrons, temperature coefficients of resistivity and similar quantities. For a definiā€¦ more
Date: June 14, 1946
Creator: Nordheim, L. W.
Item Type: Refine your search to only Report
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Pile Theory Notes for M.I.T. Seminar

Description: This report discusses topics relating to pile theory, focusing specifically on describing a nuclear chain reacting system. Topics covered include the time dependence of neutron density, controlling chain reacting boxes, and the behavior of neutrons in a pile.
Date: 1946
Creator: Feld, T. T. & Friedman, Francis L. (Francis Lee), 1918-
Item Type: Refine your search to only Report
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The Preparation of Anhydrous White Salt in Green Salt Type Box Reactors

Description: Report discussing a method for producing anhydrous TO2F2 in a box-type reactor, which takes approximately seven hours. "The method consists of a heating period of the charge oxide under oxygen, treatment, with anhydrous hydrofluoric acid gas combined with oxygen, and flushing or removal of the excess hydrofluoric acid and formed water with nitrogen gas."
Date: January 29, 1946
Creator: Johnsson, Karl Otto & Clewett, G. H.
Item Type: Refine your search to only Report
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The Preparation of High-Purity Beryllium Oxide

Description: Abstract. A method for the preparation of beryllium oxide of high purity is presented. Beryllium basic acetate (BeO-3Be(C2H3O2)2) is prepared from the metal or a convenient salt, a chloroform solution of this material extracted with redistilled water, the dried basic acetate distilled in a quartz apparatus, and this purified material converted to the oxide by fuming down with sulfuric acid and igniting at 1000 degrees C. Impurities detectable spectrographically were reduced to a very low leveā€¦ more
Date: May 27, 1946
Creator: Tomkins, F. S.; Cressman, G. W. & Tolmach, L. J.
Item Type: Refine your search to only Report
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Preparation of N-Polychloropolyfluoroheptane

Description: From introduction: "Discussion of alternate processes for manufacture of perfluoroxylene as insurance against any eventuality, e.g. disaster, poor quality, required amount of elemental fluorine not obtainable, necessity for further expansion at some future date, or decreasing cost."
Date: 1946
Creator: Babcock, J. H.; Beanblossom, W. S. & Wojcik, B. H.
Item Type: Refine your search to only Report
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The Preservation of Fluorescence Standards

Description: Report discussing the practice of using methyl methacrylate as a coating for platinium dishes in fluorescence method of uranium analysis. The experimental procedure described in this report to evaluate this practice indicates that the sample would be sufficiently protected from contamination and would not need to be stored in a desiccator.
Date: February 15, 1946
Creator: Grotta, H. M.
Item Type: Refine your search to only Report
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Procedures for the Separation of Products Resulting From Bombardment of Heavy Elements

Description: Technical report that attempts to bring together the various chemical procedures which proved most useful in studying the results of cyclotron bombardment or small scale neutron bombardments of heavy element targets. The report is limited to the elements of the "actinide", or second rare earth series, starting with thorium and including the newly discovered elements of atomic number 95 and 96. Every attempt is made to include all details necessary so this report can serve as a practical laboraā€¦ more
Date: September 23, 1946
Creator: Thompson, Roy
Item Type: Refine your search to only Report
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The Production of Uā‚‚ā‚ƒā‚„ by a Modified Calutron

Description: Abstract: Three and nine-tenths milligrams of U234 have been produced using a Calutron. A Beta-size Calutron was modified to produce complete resolution of the U234 beam from the U235 beam. With Beta charge the U234 current was 4 microamperes. The samples were collected upon flat pieces of graphite bent to fit the E curve.
Date: May 21, 1946
Creator: McKinney, C. R.
Item Type: Refine your search to only Report
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The Quantitative Estimation of the Activity of Beta Particle Emitters

Description: From abstract: "In estimating the activities of Ī²-emitting materials used in the Biology Section, most measurements were made with Geiger-Mueller counters, although Lauritsen electroscopes were used in early work. All samples were mounted on flat porcelain capsules."
Date: October 3, 1946
Creator: Zinn, Walter H. (Walter Henry), 1906-2000; Broido, Abraham; Nordeen, Clifford & Himmelstein, Sheldon H.
Item Type: Refine your search to only Report
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Radiocarbon from Pile Graphite; Chemical Methods for its Concentration

Description: Abstract. Samples of pile graphite, irradiated in a test-hole at Hanford for 15 months, have been assayed for radioactive C14, yielding 0.38 Ā± 0.04 microcuries per gram. At this level of activity, the pile graphite contains very valuable amounts of C14. The relation between the above assay and the probable average assay of pile graphite is discussed, and it is concluded that the latter is almost certainly above 0.3 uc/ gram. Controlled oxidation of this graphite, either with oxygen at ~ 750Ā°C,ā€¦ more
Date: October 10, 1946
Creator: Arnold, James R. & Libby, Willard F.
Item Type: Refine your search to only Report
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Recovery of Uranium From Beta Salvage Residues by Vapor Phase Chlorination With CClā‚„

Description: Abstract: A simple process to recover the bulk of the uranium from ignited beta salvage residues was sought. In preliminary experiments a vapor phase chlorination with CClā‚„ for about four hours followed by water and nitric acid leaching was found adequate. Recoveries are estimated at 60 to 90% of the total uranium content.
Date: April 22, 1946
Creator: Veatch, R. W., Jr. & Miller, A. J.
Item Type: Refine your search to only Report
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Recovery of Uranium From Fiberglass Air Filters

Description: Abstract: Various procedures for extracting uranium from fiberglass air filters have been tested and compared. Satisfactory results which involve the least amount of handling are obtained by simply washing the material with hot 1:1 hydrochloric acid.
Date: August 5, 1946
Creator: Adams, R. H.; Rogers, J. A. & Brown, K. B.
Item Type: Refine your search to only Report
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The Reduction of Uranium Trioxide by Ethyl Alcohol

Description: Abstract: The effect of temperature upon the rate of reduction of uranium trioxide by ethyl alcohol has been investigated, and a comparison of the reactivity of the dioxide produced at various temperatures has been made. The percent of carbon in the end product has been studied with respect to both temperature of reduction and length of exposure to alcohol. Optimum conditions for the reduction have been suggested.
Date: November 18, 1946
Creator: Haines, B. M. & Calkins, V. P.
Item Type: Refine your search to only Report
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Report on a Magnetic Drive Design for the Fercleve Coporation

Description: This report discusses the development of a design for a "permanent magnet drive to couple a motor shaft with a pump impeller through a thick metallic diaphragm of small diameter. [...] The following report presents the procedures and results of the magnetic drive development up to date of cancellation and includes the general features of the design which would have been recommended if the contract had not been cancelled" (p. 1).
Date: 1946?
Creator: Williams, W. D.
Item Type: Refine your search to only Report
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