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An Analysis of Project Data on the Corrosion of Uranium in Various Media

Description: This is a summarizing and reviewing report in which almost all the experimental data representing Project work done prior to 1949 on the corrosion of pure uranium are brought together and analyzed. New data obtained in this laboratory on corrosion rates in laboratory atmosphere and on the identification of corrosion products by electron diffraction are included. The data for corrosion in each of several different media have been plotted according to logarithm-of-the-rate versus reciprocal-tempe… more
Date: December 22, 1948
Creator: Waber, James T. (James Thomas), 1920-
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Multi-Velocity Serber-Wilson Neutron Diffusion Calculations

Description: Certain types of neutron diffusion calculations were considerably simplified when the Serber.Wilson Method was introduced about eight years ago. This method, semi-empirical In nature and named after its co-discoverers, was first formulated for the one-velocity isotropic theory and applied to spherical geometries. Within these limits it has in general proved to be a fairly accurate method. If restricted source-free case it has, in addition, turned out to be quite manageable both analytically and… more
Date: March 24, 1952
Creator: Carlson, Bengt & Bengt, Janet
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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The Spectrophotometric Determination of Uranium

Description: Measurement of the color intensity of the uranium thiocyanate complex is discussed as a method for the quantitative determination of uranium. Two procedures for amounts from 1 microgram to 1 milligram are described, and standard curves are shown. The effects of numerous foreign ions are shown, and methods of removal for some of these are discussed.
Date: March 15, 1952
Creator: Henicksman, Arthur L.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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A Determination of the Coefficient of Thermal Expansion of Alpha Plutonium

Description: The coefficient of linear expansion of alpha plutonium has been determined for the range -180 to +100 degree C by the silicon-tube and dial-indicator method. The value of the expansion coefficient is reported as [formula]. Included are a detailed description of the apparatus and a discussion of the method.
Date: March 3, 1952
Creator: Elliott, R. O. & Tate, R. E.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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The Pressures and Temperatures Developed During the Reduction of Uranium Tetrafluoride by the Bomb Method

Description: The pressure and temperature cycles developed during the bomb reduction of uranium tetrafluoride by calcium have been determined. Data for the 250, 500, and 1000 gram scale reductions are given, and the apparatus used is described.
Date: August 8, 1951
Creator: Hayward, B. R.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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A Determination of the Coefficient of Thermal Expansion of Alpha Plutonium

Description: The coefficient of linear expansion of alpha plutonium has been determined for the range -180 to +100 degree C by the silicon-tube and dial-indicator method. The value of the expansion coefficient is reported as [formula]. Included are a detailed description of the apparatus and a discussion of the method.
Date: March 1, 1952
Creator: Elliott, R. O. & Tate, R. E.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Dependence of the Oxidation of Uranium on Oxygen Pressure

Description: The oxidation of uranium metal has been studied from the standpoint of the oxygen dependence of the reaction rate in an effort to establish the mechanism. The experimental data of Perkins agree with the theoretical dependence of the oxygen pressure derived this report. This agreement supports the hypothesis that the rate-controlling step in the migration of cations in the DO2 lattice, although the observed time dependence is not necessarily in agreement with this conclusion. Experimental entrop… more
Date: March 20, 1952
Creator: Waber, James T. (James Thomas), 1920-
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Determination of Zirconium in Plutonium-Zirconium Alloys

Description: A method for determining zirconium in plutonium-zirconium alloys was required as part of an investigation of alloys containing fissionable material, with possible use in nuclear reactors. Alloys of these two elements were brought into solution with a bisulfate fusion and the zirconium was separated by precipitation with p-bromomandelic acid. Determinations were completed by weighing the zirconium oxide obtained after ignition of the precipitate at 925 degree C. The precision of this recommended… more
Date: September 5, 1952
Creator: Bergstresser, K. S. (Karl Samuel), 1909-2004
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Neutron Distribution Measurements at Pajarito by Means of Photographic Emulsion

Description: A method using photographic emulsions for the study of neutron distributions is described. The construction of a simple machine for producing experimental critical assemblies in which the method has been used is reported. Sources of error are discussed. Curves of the perturbations when small spheres of various materials are placed in the center of the assembly are shown.
Date: May 15, 1952
Creator: Young, Dwight S.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Total Neutron Cross Sections for U235, Normal Uranium, Pu239

Description: The total neutron cross sections for normal uranium, U235, and Pu239 are reported as a continuous function of energy for neutron energies between 40 and 7500 Kev. Three additional measurements were made between 17 and 20 Mev. The data were obtained from a good geometry transmission experiment in which 1-in.-diameter cylindrical samples were interposed midway between a neutron source and a neutron counter spaced at about 20 in. separation. In general, the statistical errors were within +- 0.2 ba… more
Date: November 20, 1952
Creator: Henkel, R. L.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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A Method of Cleaning Plutonium Metal Samples for Analysis

Description: The usual method of removing surface oxide from plutonium metal samples, by electrolytic cleaning in a mixture of ethylene glycol and phosphoric acid, is not satisfactory for preparing samples for oxygen determination. Samples prepared in this way give erratic oxygen values. This report describes a new method of electrolytic cleaning, using a 20 ~ aqueous potassium carbonate solution as the electrolyte. The sample is placed in a rotating tantalum cup which is made the anode. Electrolysis for tw… more
Date: February 2, 1953
Creator: Smiley, William G. (William Gooding), 1915-
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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The Nickel-Plutonium System

Description: A tentative nickel-plutonium constitutional diagram was based on data obtained by thermal analysis, metallography, and x-ray-diffraction techniques. The systema is a complex one with the following important features. Nickel is soluble in epsilon plutonium, extending the epsilon field to 4.3 at.% nickel at 465 deg C. Nickel and plutonium form six intermetallic compounds, PuNi, EnNi/sub 2/, PuNi/sub 3/, PuNi/sub 4/, PuNi/sub 5/, and PuNi/sub 9/. The compound PuNi/ sub 5/ forms congruently from th… more
Date: March 1, 1951
Creator: Wensch, Glen William, 1917-; Whyte, D D.; Cramer, E M.; Ellinger, F H.; Schonfeld, F W. & Struebing, V O.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Oralloy Cylindrical Shape Factor and Critical Mass Measurement in Graphite, Paraffin, and Water Tampers

Description: Critical mass of an Oy (93.9%) sphere in graphite is given as a function of graphite tamper thickness. It was shown that approximately 20(in) of graphite is effectively infinite and that the approximately 17(in) used herein is approximately 98% infinite. Critical mass measurements of Oy (93.9%) spheres and cylinders of different diameters are given for approximately 17(in) graphite tamper, for effectively infinite paraffin tamper, and for effectively infinite water tamper. From these measuremen… more
Date: October 27, 1951
Creator: Mallary , E. C.; Paxton, Hugh Campbell & White , R. H.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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The Determination of Oxygen in Plutonium by the Capillary Trap Method

Description: A new method for the determination of O/sub 2/ in metals is described. The sample is dropped into molten Pt in a graphite crucible. The oxide in the sample reacts with C to form CO, which is swept out by a stream of argon at atmospheric pressure. The CO is oxidized to CO/sub 2/, which is condensed in a capillary trap and measured with a capillary manometer. The apparatus is sensitive to 0.3 mu g of O/sub 2/, and routine 50-mg Pu samples give a standard deviation of 7 ppm or 0.35 mu g. Pu sample… more
Date: February 1, 1953
Creator: Smiley, William G. (William Gooding), 1915-
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Electrochemical Exchange of Silver and Polonium

Description: It has been found that two silver atoms replace one polonium ion during the electrochemical exchange of polonium ion with silver metal. It is believed that the most probable exchange reaction may be described by the equation Po++ + 2Ag = Po + 2Ag+ . From the concentrations of polonium ion and Ag+ ion when the exchange reactions were terminated, calculations indicate Po = Po^ + 2e", E°< - 0.7.
Date: March 1953
Creator: Treiman, Leonard H.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Angular Distribution of Fragments from Neutron-Induced Fission

Description: The angular distribution of fission fragments from the neutron-induced fission of several isotopes has been studied. Distributions were observed for thermal neutrons on U233 and U235, Lady Godiva leakage neutrons on U235 and U238, and 14 Mev neutrons on U233, U235, U238, Th232, and Np237. No anisotropy was observed for thermal neutron fission, whereas for Lady Godiva neutrons and 14 Mev neutrons the probability of fission along the axis of the neutron beam was determined to be higher than for f… more
Date: May 7, 1953
Creator: Brolley, John Edward, 1919- & Dickinson, W. C.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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A Review of Corrosion of Uranium and its Alloys

Description: One characteristic of the corrosion of uranium is the accelerating destruction of the metal under both dry and humid conditions and throughout a wide temperature range. Another corrosion property is the fracturing and fragmentizing of the oxide products. This results in an accelerating or decelerating growth law being operative at a particular time. This time is determined by whether the oxide ruptures rapidly or slowly compared to the rate of growth of the unfractured oxide. The reaction with … more
Date: November 7, 1952
Creator: Waber, James T. (James Thomas), 1920-
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Material Replacement Experiments ; Theory and Measurements for the Lady Godiva Assembly

Description: The perturbation theory for material replacement experiments is given through second order thus permitting corrections for sample size. Computed flux and adjoint distribution functions are tabulated for the Lady Godiva assembly enabling the observed danger coefficients for U-238 and U-235 to be compared with corresponding predicted values. Consistency of this data is checked by its use in three independent combinations each yielding for the effective fraction of delayed neutrons from fast fissi… more
Date: April 23, 1953
Creator: Hansen, Gordon E. (Edward), 1920- & Maier, Clifford Lawrence
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Disassembly of the Los Alamos Fast Reactor

Description: The procedures used in the complete and permanent disassembly of the Los Alamos Fast Reactor are described.
Date: July 1953
Creator: Jurney, Edward Thornton, 1921-; Arnold, G. P.; Corpieri, E. F.; Leachman, R. B.; Pierce, E. H.; Montoya, J. et al.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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A Simple Method of Calculating Critical Masses of Proton Moderated Assemblies

Description: Semi-empirical modifications of age theory have been made to interpret the critical masses of proton moderated assemblies, which may or may not have reflectors of various substances, in particular, water or steel. Section I shows that critical masses of untamped water moderated systems can be calculated by use of an appropriate age and linear extrapolation length. Assuming that all captures and fissions take place at thermal, a familiar expression can be set up which contains the age and extrap… more
Date: May 1953
Creator: Bell, George I.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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A Ball Holder for Coating Operations

Description: A device has been designed which will support small spheres and cylinders in a vacuum system during a plating operation. While supporting the object to be plated, the device automatically shifts the position of the supports so that the coating is evenly distributed. This report describes the mechanism by which this motion is achieved.
Date: April 8, 1953
Creator: Lilienthal, James R.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Hydrogen Slowing-Down Method for Criticality Calculations

Description: A criticality equation is derived assuming slowing-down only by hydrogen. The use of criticality experiments as a basis for calculation is described. Approximate methods are given for handling inharmonicities and multi-region reactors. Some criticality data on solutions of U03 dissolved in H3PO4 are listed in Appendix 1, and the Goertzel-Selengut equations are derived in Appendix II.
Date: September 1953
Creator: Bendt, Philip Joseph, 1919-
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Topsy: a Remotely Controlled Machine for the Study of Critical Assemblies

Description: This report describes the construction, operation, and typical uses of Topsy, the versatile, remotely controlled, critical assembly machine at Pajarito. Section 1 covers the mechanical design of the machine, and the hydraulic and electrical operation of the various components. Section 2 describes how Topsy is used for investigating reacting metal assemblies. Procedures for establishing a delayed critical configuration and operation at delayed critical are illustrated for the oralloy-tuballoy sy… more
Date: June 1953
Creator: White, Roger H.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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