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Welding of Plutonium

Description: Delta-stabilized plutonium can be welded to itself or almost any other metal using the inert-gas metal-arc process. Equipment and procedures suitable for the welding of delta-stabilized plutonium under various conditions are described.
Date: May 9, 1958
Creator: Anderson, J. W.
Partner: UNT Libraries Government Documents Department
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Time Dependence of the Slowing Down of Neutrons with Constant Scattering Mean Free Path

Description: Simple expression are derived for the time dependence of slowing down of neutrons in a simple media. In Section I, a method suggested by age theory is used, while in section II, a two parameter scattering function is employed. Results are compared with exact calculations.
Date: May 31, 1952
Creator: Bell, G. I. & Bethe, Hans A. (Hans Albrecht), 1906-2005
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.
Partner: UNT Libraries Government Documents Department
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Determination of Hydrogen in Lithium Hydride

Description: Abstract: "A method for determining hydrogen in lithium hydride by heating samples with lead at 600 C, was developed. The hydrogen evolved during thermal decomposition of the hydride is purified and oxidized to water with cupric oxide at 400 C. The analysis is completed by collecting and weighing this water. Success in development of the analytical procedure has depended upon a careful design and assembly of equipment for handling samples in a dry, inert atmosphere. For seven pure hydride sampl… more
Date: May 1954
Creator: Bergstresser, K. S. & Waterbury, Glenn R.
Partner: UNT Libraries Government Documents Department
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Separation of Small Amounts of Scandium From Uranium

Description: Abstract: A method for separating small amounts of scandium (1 to 10 mg.) from a gram of uranium depends upon formation of insoluble uranium peroxide while the scandium in solution is complexed with ethylenediamine-tetraacetic acid. The precipitated peroxide carries down less than 30 p.p.m. of scandium. Uranium left in solution, less than one milligram in amount, does not interfere when the scandium is precipitated as ammonium scandium tartrate and determined gravimetrically by ignition of the … more
Date: May 1954
Creator: Bergstresser, Karl S.
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.
Partner: UNT Libraries Government Documents Department
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Proposed Electron Probe of the Discharge Current in the Perhapsatron

Description: Report discussing a proposed electron probe that is connected to the discharge current from a device called the Perhapsatron. "The Perhapsatron is an apparatus for the study of the type of magnetic containment known as the 'pinch effect.'"
Date: May 1954
Creator: Dunaway, R. E. & Phillips, J. A.
Partner: UNT Libraries Government Documents Department
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Critical Masses of Graphite-Tamped Heterogeneous Oy-Graphite Systems

Description: Critical mass measurements on graphite-tamped, heterogeneous oralloy-graphite systems have been made as a safety guide for certain oralloy casting procedures. Various concentrations were obtained by alternately stacking 10.5 in. diameter oralloy and graphite plates. In the relation Oralloy critical mass = constant x (fraction of oralloy in the core volume) -n values for the exponent, n, in the neighborhood of 0.70 were obtained.
Date: May 1954
Creator: Hoogterp, J. C.
Partner: UNT Libraries Government Documents Department
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Plutonium-Metal Critical Assemblies

Description: The two plutonium-metal critical assemblies that have been studied at Pajarito Site are Jezebel, bare plutonium; and Popsy, a plutonium core in a thick normal uranium reflector. These assemblies and their properties are described.
Date: May 1956
Creator: Jarvis, G. A.; Linenberger, G. A. & Paxton, Hugh Campbell
Partner: UNT Libraries Government Documents Department
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The Decontamination of Uranium from Fission Products by the Use of the Uranyl Oxalate Precipitation Reaction

Description: Abstract: "Decontamination factors of the order of 10-4 were obtained for Beta and Gamma emitters present as fission products when uranium was precipitated from 50 mC activity level solutions as uranyl oxalate under normal uranium yield conditions for three cycles (~60%). Factors of the order of 10-3 were obtained by the use of this reaction with similar solutions under relatively high uranium yield conditions for three cycles (~90%). The uranium peroxide precipitation reaction proved to be of … more
Date: May 10, 1951
Creator: Kelchner, B. L.
Partner: UNT Libraries Government Documents Department
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Forming of Uranium in the Gamma Phase Temperature Range

Description: It has been found relatively easy to form uranium in the gamma phase temperature range by hot pressing, forging, or extrusion. The metal is quite plastic and flows readily to form a shape. Several temperatures from 800 degree C to 1000 degree C were investigated. No forming difficulties were experienced with the metal at the several temperatures concerned. The major difficulty in gamma phase hot pressing or extruding was associated with the tools. Metals or ceramics were not successful as tools… more
Date: May 1, 1951
Creator: Levinson, L. S.; Cribble, W. C.; Taub, J. M. & Doll, D. T.
Partner: UNT Libraries Government Documents Department
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A Portable Apparatus for the Determination of Tritium in Liquid Samples

Description: A glass vacuum manifold and ionization chamber are evacuated and filled to atmospheric pressure with hydrogen and tritium. The hydrogen and tritium are evolved by dropping liquid, urine or water, on calcium metal and dried by passing through a suitable freezing bath. The current produced by the beta activity due to tritium is measured with a vibrating reed electrometer. The method has a precision of +3 per cent between the ranges of 100 and 1500 pc of tritium per liter. From O to 100 pc of trit… more
Date: May 1954
Creator: McClelland, Jean
Partner: UNT Libraries Government Documents Department
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Oralloy Hydride Critical Assemblies

Description: Part I of this report covers critical-mass determinations for pseudospheres of oralloy hydride composition (approximating UH3) in 8"-thick Tu and Ni tampers and in the Tu tamper with Ni liner. The critical mass of a hydride cube in the thick Tu also is given. Data on weight and dimensional changes of hydride pieces during the period of use are included. In Part II are presented the results of Rossi time-scale measurements on the hydride assemblies. Values of alpha at delayed critical and its va… more
Date: May 22, 1950
Creator: Paxton, Hugh Campbell; Orndoff, John D. & Linenberger, G. A. (Gustave Aaron)
Partner: UNT Libraries Government Documents Department
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Height Burst for Atomic Bombs, 1954 : Part I., The Free-Air Curve

Description: This paper is issued in two volumes: LA-1664 and LA-1665. In LA-1664, the fundamental properties of a shock in free air are described, including the reasons for failure of similarity scaling. The results of an analytic solution for strong shocks are presented, which permit a determination of the energy in a shock wave from its rate of growth without recourse to similarity assumptions; from it the scaling laws for both homogeneous and inhomogeneous atmospheres are explicitly shown. The total ene… more
Date: May 1954
Creator: Porzel, F B
Partner: UNT Libraries Government Documents Department
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Height of Burst for Atomic bombs, 1954. Part II, Theory of Surface Effects

Description: This paper is issued in two volumes: LA-1664 and LA-1665. In LA-1664, the fundamental properties of a shock in free air are described, including the reasons for failure of similarity scaling. The results of an analytic solution for strong shocks are presented, which permit a determination of the energy in a shock wave from its rate of growth without recourse to similarity assumptions; from it the scaling laws for both homogeneous and inhomogeneous atmospheres are explicitly shown. The total ene… more
Date: May 1954
Creator: Porzel, F. B.
Partner: UNT Libraries Government Documents Department
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A Sensitive Analytical Method for Carbon in Uranium

Description: The capillary trap method for the determination of carbon in metals (LA-1128) has been modified to give a fivefold improvement in sensitivity (0.1 microgram of carbon per millimeter). Samples from pure uranium buttons gave standard deviations ranging from 1.4 to 3.2 p.p.m. Varying sample size, in the range from 100 to 250 milligrams, did not affect the results significantly. The time required for an analysis is about 13-14 minutes. The method should be equally useful for plutonium.
Date: May 1954
Creator: Smiley, W. G.
Partner: UNT Libraries Government Documents Department
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The Polarographic Determination of Uranium in the Presence of Plutonium

Description: Strubl's polarographic method for the determination of uranium in the presence of iron can be used for the determination of uranium in plutonium solutions. A hydroxylamine hydrochloride solution (2M) is used as the supporting electrolyte. This reduces the plutonium to the plus three oxidation state without reducing the uranium. The uranium may then be determined polarographically by measuring the height of the uranyl reduction wave (UVI to UV) at -0.35 volts (vs. S.C.E.) applied potential. Solu… more
Date: May 25, 1951
Creator: Smith, Maynard E. (Maynard Elliott)
Partner: UNT Libraries Government Documents Department
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The DD and TD Cross Sections

Description: The total cross sections of the reactions DDp, DDn, TD at 10 kev to 10 Mev are estimated from a review of the experimental data up to January 1951. Maxwell averages for DDp and TD computed from these estimates are given, together with some fitted analytic expressions provided for machine use. A collection of the identifiable earlier estimates is also included for reference and for comparison with the new figures. For relative order of magnitude purposes, cross sections and the derived Maxwell a… more
Date: May 10, 1951
Creator: Tuck, J L
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.
Partner: UNT Libraries Government Documents Department
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