21 Matching Results

Search Results

Results: 1 - 21
open access

Burst Characteristics Associated with the Slow Assembly of Fissionable Materials

Description: This technical report is a sequel to LA-596, "Efficiency for Very Slow Assembly" by K. Fuchs. Herein are given estimates of temperature rise and pressure developed as a result of active material slowly being driven supercritical. Marginal assembly rates can thus be determined for both metal and solution assemblies above which the disassembly by thermal expansion is explosive in the sense that the active material or containing vessel is ruptured.
Date: July 1952
Creator: Hansen, G. E.
Partner: UNT Libraries Government Documents Department
open access

The Colorimetric Determination of Boron in Zirconium Hydride

Description: The quantitative estimation of submicrogram amounts of boron in zirconium hydride using a colorimetric procedure is described. Solution of the sample in sulfuric acid or hydrofluoric acid and subsequent distillation of methyl borate without boron loss or contamination is shown to be possible. Using the curcumin color reaction, quantities of boron as low as 0.01 microgram can be detected. The method should apply equally well to zirconium metal and compounds, providing they can be dissolved under… more
Date: July 1954
Creator: Waterbury, Glenn R. & Metz, Charles F.
Partner: UNT Libraries Government Documents Department
open access

Detailed Uranium Hydrogeochemical and Stream Sediment Reconnaissance of the Tallahassee Creek, Badger Creek, Castle Rock Gulch, and Buffalo Gulch Areas in the Northwestern Part of the Pueblo NTMS Quadrangle, Colorado

Description: Report describing chemical analysis of 62 water and 620 sediment samples during a follow-up geochemical survey to search for uranium in the Pueblo quadrangle.
Date: July 1980
Creator: Shannon, Spencer Sweet, Jr.
Partner: UNT Libraries Government Documents Department
open access

Determination of the 14-Mev Li7 (n,n'a)T Cross Section from Sphere Multiplication and Transmission Measurements

Description: 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.
Partner: UNT Libraries Government Documents Department
open access

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.
Partner: UNT Libraries Government Documents Department
open access

Effect of Plutonium on the Fluorometric Determination of Uranium

Description: The fluorometric method for determining microgram quantities of uranium dissolved in concentrated sulfuric acid was reinvestigated for the purpose of measuring any interference caused by plutonium in uranium samples. No plutonium fluorescence, and therefore no positive errors due to plutonium, were observed. Limited transmittance of hexavalent plutonium in sulfuric acid at 513, and especially at 360 millimicrons, produces variable negative errors in uranium determinations.
Date: July 1954
Creator: Bergstresser, K. S. (Karl Samuel), 1909-2004
Partner: UNT Libraries Government Documents Department
open access

Fast Neutron Interactions with Li⁶ and Li⁷

Description: Abstract: "Measurements have been made of the cross sections for the reactions Id-6(n, dn)He-4 and Li-7(n, tn)He-4 over an incident neutron energy range of 5 - 14 MeV. The energy and angular distributions of all reaction products were determined."
Date: July 18, 1963
Creator: Rosen, Louis
Partner: UNT Libraries Government Documents Department
open access

Further Study of Hematological Changes in Humans Chronically Exposed to Low Level Gamma Radiation

Description: This technical report summarizes the apparent hematological changes in 10 individuals, exposed to total-body gamma radiation in near tolerance amounts, over a period of four and one-half years. Two control groups, in addition to the exposed group, were used for comparative purposes. Control group I received essentially no gamma or beta radiations. Control group II received exposures at least a factor of 10 below those of the exposed group. The average total leukocyte count, absolute neutrophil… more
Date: July 1952
Creator: Carter, Robert E. & Worman, Frederick C. V., 1910-
Partner: UNT Libraries Government Documents Department
open access

The Inhour Equation for the Tuballoy Tamped Oralloy sphere

Description: Exponential rise times, T, of neutron flux in an Oy-Tu assembly have been measured for a set of points essentially equally spaced reactivity-wise in the interval between delayed and prompt critical corresponding to [infinity] > T > 5 seconds. The relationship between positive period and reactivity thus obtained is used to decide (preferentially) between two currently used but divergent collections of delayed neutron data, specifically with respect to the relative abundances of delayed neutrons … more
Date: July 15, 1951
Creator: Hansen, Gordon E. (Edward), 1920-
Partner: UNT Libraries Government Documents Department
open access

Neutron Burst from a Cylindrical Untamped OY Assembly

Description: A neutron burst from an untamped cylindrical Oy assembly occurred at the Pajarito Remote Control Laboratory at 1800 hours on 18 April 1952. The circumstances causing the burst and a description of the assembly involved are given There was no personnel hazard. Normal operations could have been resumed on other assemblies withing two or three hours after the burst. No evidence of damage to the oy was observed. It was determined that the burst resulted in 1.5 x 10(16) fissions in the oy. Also repo… more
Date: July 22, 1952
Creator: Mallary, E. C.; Hansen, G. E.; Linenberger, G. A. & Wood, D. P.
Partner: UNT Libraries Government Documents Department
open access

Oxidation of Metals Subjected to a Linear Temperature Increase: Cubic and Logarithmic Laws

Description: The total amount of oxidation which occurs up to a given time when a metal is subjected to a continuously increasing temperature has been studied by Fasseli and coworkers. A constant rate of increase as well as the linear and parabolic oxidation laws were assumed. The present report extends the analysis to include to the cubic and logarithmic growth laws. The notation for the nth order exponential integral functions which is used here simplifies the equations and the calculations.
Date: July 1955
Creator: Waber, James T. (James Thomas), 1920-
Partner: UNT Libraries Government Documents Department
open access

Plastic Bonded RDX

Description: This technical report describes the preparation and properties of plastic bonded RDX mixtures containing approximately 30 weight percent RDX. These mixtures may readily be prepared by a method adaptable to existing ordnance plant equipment. they are roughly comparable to Compositions A and B in sensitivity and explosive performance, but are much stranger physically than these or similar explosives.
Date: July 17, 1952
Creator: James, E. & Smith, L. C.
Partner: UNT Libraries Government Documents Department
open access

Polarographic Behavior of Various Metal Ions in Plutonium Solutions

Description: The reported procedures for the polarographic determination of uranium, vanadium, and titanium in plutonium were investigated to ascertain if they could be used to determine other common metals in plutonium. It was found that the procedure using hydroxylamine hydrochloride to reduce plutonium to the (III) oxidation state could be used to determine bismuth, platinum, rhodium, copper, tin, lead, thallium, iridium, and cadmium. The procedure using zinc and zinc amalgam in hydrochloric acid to redu… more
Date: July 1953
Creator: Warren, C. G.
Partner: UNT Libraries Government Documents Department
open access

Problems of Air-Borne Contamination in Handling of Pu F₄ Powders

Description: Abstract: Studies were made of the air-borne contamination present during the operation of reducing plutonium tetrafluoride powder to the metal. Equipment design changes were made and operation technique changes were made until the amount of contamination present during operations was well below tolerance levels.
Date: July 31, 1947
Creator: Kennedy, William R.; Dumrose, A. & Ludwig, A.
Partner: UNT Libraries Government Documents Department
open access

A Proposal For Reducing Impurities in a Stabilized Pinched Discharge

Description: It is proposed to reduce the initial wall hangup and consequent plasma contamination of a stabilized pinched discharge by reducing the Bz pressure difference across the current sheath to nearly zero at early times. Two methods for accomplishing this are proposed, both involving multistage programming of the Bz system.
Date: July 31, 1957
Creator: Lovberg, Ralph H. (Ralph Harvey)
Partner: UNT Libraries Government Documents Department
open access

The Rolling of Gold Sheet for LAPRE 2 Pressure Liner

Description: From abstract: "This report discusses a special handling procedure devised to prevent contamination of high-purity gold while processing the metal from cast billet to final sheet. Gold of 99.99% purity was cast into rectangular billets and rolled into sheet whose final dimensions were 48 by 12-1/2 by 0.015 inch...As a final step, the sheet was annealed dead-soft in preparation for subsequent forming operations."
Date: July 1958
Creator: Keil, R. W.; Hanks, G. S. & Taub, J. M.
Partner: UNT Libraries Government Documents Department
open access

Sample Collector and Counter

Description: From abstract: "An apparatus is described which automatically separates a flow of drops into a series of equal samples."
Date: July 27, 1954
Creator: Deal, James B., Jr. & Buchen, John F.
Partner: UNT Libraries Government Documents Department
open access

Taylor Instability in Shock Acceleration of Compressible Fluids

Description: The initial growth of irregularities on an interface between two compressible fluids is studied for impulsive (i.e., shock) acceleration. It was found that the ultimate rate of growth is roughly the same as that given by the incompressible theory, if the initial compression of the irregularities and of the fluids is taken into account.
Date: July 1954
Creator: Richtmyer, Robert D.
Partner: UNT Libraries Government Documents Department
open access

Uranium Hydrogeochemical and Stream Sediment Reconnaissance Data Release for the Torrington NTMS Quadrangle, Wyoming, Including Concentrations of Forty-Two Additional Elements

Description: From introduction: This report contains data collected during a geochemical survey for uranium in the Torrington National Topographic Map Series (NTMS) quadrangle of east-central Wyoming (Fig. 1) by the Los Alamos Scientific Laboratory (LASL) as part of the nationwide Hydrogeochemical and Stream Sediment Reconnaissance (HSSR).
Date: July 1980
Creator: Shannon, Spencer Sweet, Jr.
Partner: UNT Libraries Government Documents Department
open access

Uranium Hydrogeochemical and Stream Sediment Reconnaissance Data Release for the Wyoming Portions of the Driggs, Preston, and Ogden NTMS Quadrangles

Description: From summary: This report contains data collected during a geochemical survey for uranium in the Torrington National Topographic Map Series (NTMS) quadrangle of east-central Wyoming (Fig. 1) by the Los Alamos Scientific Laboratory (LASL) as part of the nationwide Hydrogeochemical and Stream Sediment Reconnaissance (HSSR).
Date: July 1980
Creator: Broxton, David E. & Nunes, Henry P.
Partner: UNT Libraries Government Documents Department
Back to Top of Screen