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Determination of the 14-Mev Li7 (n,n'a)T Cross Section from Sphere Multiplication and Transmission Measurements
By utilizing lithium spherical shell transmission and multiplication measurements, the Li7(n,n'y)Li7 and the He6-production cross sections, it is possible to deduce that the 14-Mev Li (n,n'a)T cross section is 325 ± 75 mb. A spectrum for neutrons degraded in energy between 0 and 12 Mev is also given.
Date:
July 1054
Creator:
Thomas, R. G.
Object Type:
Report
System:
The UNT Digital Library
Patent of Invention--Gr 5--Cl.3--Bearing
The object of this invention is a bearing: a thrust bearing. This bearing is one in which the bearing faces is a continuous annular surface and the other an annular surface divided into shoes having the form of sectors.
Date:
October 28, 1925
Creator:
Fulpius, Edward
Object Type:
Report
System:
The UNT Digital Library
Applied Potential Corrosion of Aluminum and 18-8 Stainless Steel Alloys
Introduction: In anticipation of the design of equipment for heat transfer tests, a series of short exposure corrosion tests was initiated in an effort to determine the order of magnitude of the corrosion involved. Information was required on the effect on corrosion rates of applying a potential between two concentric tubes, the annulus between them containing condensate water.
Date:
March 13, 1930
Creator:
Sanborn, Kenneth L.
Object Type:
Report
System:
The UNT Digital Library
Selected Russian Papers on Geochemical Prospecting for Ores
A selection of Russian papers on the geochemical prospecting for ores
Date:
1939/1946
Creator:
Sokoloff, V. P.; Hawkes, H. E. (Herbert Edwin), 1912-1996; Ratsbaum, E. A.; Sergeev, Evgeniĭ (Evgeniĭ Aleksandrovich); Sergeev, Evgeniĭ (Evgeniĭ Aleksandrovich); Sergeev, Evgeniĭ (Evgeniĭ Aleksandrovich) et al.
Object Type:
Report
System:
The UNT Digital Library
The Conversion of UF4 to U3Os
Methods of conversion of UF4 to U3O8 by fusion with ammonium oxalate dihydrate and other salts are described.
Date:
May 28, 1941
Creator:
Tevebaugh, A. D.; Tevebaugh, R. D.; Cline, W. D. & Warf, James C.
Object Type:
Report
System:
The UNT Digital Library
Slowing Down of Neutrons
From introduction: "The Boltzmann equation expressing conversation of particles in phase space is set up."
Date:
August 18, 1941
Creator:
Breit, G.
Object Type:
Report
System:
The UNT Digital Library
The Production of Fluorocarbons by the Reaction of Fluorine With Silicone Carbide
This technical report details the production of fluorocarbon by reactions between fluorine and silicon carbide. The report contains two figures depicting aspects of the process.
Date:
December 1941
Creator:
Priest, Homer F. & Grosse, A. V.
Object Type:
Report
System:
The UNT Digital Library
The Use of Sodium Diethyl Dithiocarbamate as a Reagent for the Determination of T
This report investigates the use of sodium diethyl dithiocarbonate as a reagent for the determination of T.
Date:
1942
Creator:
Jones, A. G.
Object Type:
Report
System:
The UNT Digital Library
Measurement of Density of Liquid UF6
This report describes a method and apparatus used to determine the density of liquid sodium hexafluoride. The report includes a drawing of the density cell used in the experiment.
Date:
March 29, 1942
Creator:
Priest, Homer F.
Object Type:
Report
System:
The UNT Digital Library
Interaction of Be with Fission Neutrons
To determine whether or not the (n,2n) reaction in Be would produce a net increase in fission neutrons in a power plant, the distribution of In resonance neutrons slowed down from fission energies in a graphite block was measured with and without a 2" of Be in front of a U3O8 slab undergoing fission. The thermal neutrons producing the fissions were obtained by slowing down neutrons from a cyclotron source. The observed distribution without Be was well represented by a Gaussian source range 36 cm. (corresponding to an initial fission energy of 3 MeV) and a similar sink of range 7.8 cm. The total In resonance intensity with Be was 5% less than without Be. On the assumption that the effect of the Be is entirely due to its different mean free path and moderating power, the In distribution with Be was calculated. Since the m.f.p. as a function of energy is not known for Be, two separate calculations were made using the highest (2.9 cm.) and the lowest (1.80 cm.) possible values for the effective Be m.f.p. Both calculated curves were found to be higher than the observed Be distribution, indicating that at least 10% of the fission neutrons …
Date:
April 29, 1942
Creator:
Borst, L.; Allison, S. K.; Wheeler, John Archibald, 1911-2008 & Weinberg, Alvin Martin, 1915-2006
Object Type:
Report
System:
The UNT Digital Library
An Attempted Separation of Mercury Isotopes
The following document describes the analysis on an attempt at separating mercury isotopes by making their environments as widely different as possible.
Date:
April 30, 1942
Creator:
Kauzmann, Walter, 1916-
Object Type:
Report
System:
The UNT Digital Library
Capture Cross Section of Si for Thermal Neutrons
The following report analyzes different values and measurements that give the same results for the captured cross section of thermal neutrons for Si.
Date:
May 6, 1942
Creator:
Coon, J. H.
Object Type:
Report
System:
The UNT Digital Library
The Preparation of Tungsten Hexafluoride
From introductory paragraph: "Because of the possibility that tungsten hexafluoride might occur as an impurity in uranium hexafluoride it seemed worthwhile to prepare some of the material in order to become familiar with its mode of preparation, reactions, etc."
Date:
June 1942
Creator:
Priest, Homer F. & Colton, R.
Object Type:
Report
System:
The UNT Digital Library
Examples for Pressure Drop Calculations in Parallel Flow Helium Cooling
Pressure drop calculations are shown for He cooled power plants ranging from 400,000 kw to 30,000 kw.
Date:
June 18, 1942
Creator:
Feld, Bernard T. (Bernard Taub), 1919-1993 & Szilard, Leo
Object Type:
Report
System:
The UNT Digital Library
Report on Determination of Densities of Several Uranium Compounds
This technical report details a process in order to determine the densities of several uranium compounds.
Date:
August 10, 1942
Creator:
Priest, Homer F. & Priest, G. L.
Object Type:
Report
System:
The UNT Digital Library
The Extraction Method of Purification of Uranyl Nitrate
Technical report. Three extractions of a diethyl ether solution of uranyl nitrate with small portions of water are effective in removing rare earths, as is shown by radio-gadolinium and radio-europium tracer experiments. A study of representative ethers, alcohols, ketones, and esters showed that diethyl ether and a mixture of 85% ethyl methyl ketone with 15% xylene are the best solvents for the extraction.
Date:
August 28, 1942
Creator:
Myers, L. S., Jr.; Anderson, K. C.; Wexler, Sol & Boyd, G. E.
Object Type:
Report
System:
The UNT Digital Library
On Certain Phase Equilibria in the Ternary System Uranyl Nitrate--Ether--Water at 25° and at 1°C
This report follows a study that deals with a portion of the ternary diagram previously analyzed, namely the boundary curves which separate the central area of two coexistent liquid phases from the two border stripe representing one-phase liquid systems.
Date:
October 22, 1942
Creator:
Van Name, Ralph Gibbs
Object Type:
Report
System:
The UNT Digital Library
Effect of Temperature on the Surface of Cast Uranium Metal
Technical report. Photomicrographs showing the effect of heating polished uranium surface at 600, 700, 850, and 1000 degrees C, and sandblasted and cut surface at 1000 degrees C are included.
Date:
December 3, 1942
Creator:
Johns, I. B; Newton, A. S. & Gladrow, E. M.
Object Type:
Report
System:
The UNT Digital Library
Radiation Problems of the Chemical Plant
"Absorption measurements have been made in a large body of water to evaluate the contribution to the radiation intensity produced by the degradation of radiation without absorption. Radiation intensities three times those expected from a simple exponential absorption were found. Scattering from the air of gamma radiation has been measured and has been found to agree satisfactorily with theoretical predictions. The penetration of radiation through curved pipes in shielding has been measured and been found to be a flat topped function. A 2" pipe bent in the arc of a circle of 7' chord and a 10' radius gives a reduction intensity over the intensity in air at the same distance of 2.5X10⁴."
Date:
December 12, 1942
Creator:
Borst, Lyle B. & Wollan, Ernest Omar
Object Type:
Report
System:
The UNT Digital Library
Poisoning and Production in a Power Plant
The yield of 49, the efficiency of production of 49, and poisoning in a power plant are discussed. Only the crudest of estimates of the poisoning are possible: these indicated that production will probably not be hampered by poisoning. In this case the yield of 49 could be as high as 3 kg/ton but only about 2 kg/ton is compatible with a fairly high efficiency. In the case that production is stopped by poisoning, smaller yields, proportional to the tolerable loss in k, are obtained. In this case the yield will be improved by a factor of 2 or 3 if only the most poisoned parts are extracted and replaced by new uranium.
Date:
December 15, 1942
Creator:
Ashkin, J.; Christy, Robert F., 1916-2012 & Feld, Bernard T. (Bernard Taub), 1919-1993
Object Type:
Report
System:
The UNT Digital Library
Chain Reaction of Pure Fissionable Materials in Solution
The critical mass of 94-239 and the corresponding critical dimensions of homogeneous mixtures of 94-239 with various moderating media been calculated as a function of the concentration of 94. A simple transformation makes the figures applicated to92-235. the results are in essential agreement with the preliminary estimated made independently by Oppenheimer and Serber. The problem of the stability of a chain reaction in solution and questions of protection are discussed.
Date:
January 1, 1943
Creator:
Christy, Robert F., 1916-2012 & Wheeler, John Archibald, 1911-2008
Object Type:
Report
System:
The UNT Digital Library
Measurement of the Slow Neutron Absorption Cross Section of Some Heavy Isotopes
The following report investigates cross sections for the absorption of slow neutrons of heavy isotopes. The purpose of these measurements was to determine the cross section of an isotope of element 94 for the process of fission by the absorption of a slow neutron, relative to the cross section of U235 for the same process, that is, to measure R.
Date:
1943
Creator:
English, Spofford Grady
Object Type:
Report
System:
The UNT Digital Library
The Production of Uranium Metal by Metal Hydrides Incorporated
Synopsis: Metal Hydrides Incorporated was a pioneer in the production of uranium metal on a commercial scale and supplied it to all the laboratories interested in the original research, before other methods for its production were developed. Metal Hydrides Inc. supplied the major part of the metal for the construction of the first experimental pile which, on December 2, 1942, demonstrated the feasibility of the self-sustaining chain reaction and the release of atomic energy.
Date:
1943
Creator:
Alexander, P. P.
Object Type:
Report
System:
The UNT Digital Library
The Toxicity of Fluorine
The following report discusses the toxicity of fluorine as described in literature on fluorine intoxication and case studies of Roholm's experimental observations.
Date:
1943
Creator:
Ferry, J. L.
Object Type:
Report
System:
The UNT Digital Library