UNT Libraries Government Documents Department - 902 Matching Results

Search Results

open access

Pile Neutron Physics (2)

Description: Abstract: In order to calculate the difference between the number of neutrons which cross the x = o plane before and after the channel has been introduced we consider the number of neutrons which cross an element of cylinder wall at a height x1 and in a direction between (see Figure 5).
Date: June 3, 1947
Creator: Weinberg, Alvin Martin, 1915-2006
open access

Modified Simpson Methane Flow Proportional Alpha Counter and Fission Counter

Description: Abstract: This technical report consists of series of drawings of the instrument with the following explanation. The modification of the Simpson Methane flow proportional counter consists of a means for inserting and replacing samples into the chamber through an air-lock device which avoids the introduction of even a small quantity of air into the active volume of the chamber. This is accompanied by sweeping out the small volume of the air-lock containing the sample with methane gas before the… more
Date: July 9, 1947
Creator: Freedman, M. S.
open access

The Toxicity and Metabolism of Plutonium in Laboratory Animals

Description: Introduction. The main objective of the Metallurgical Project was the preparation of large quantities of plutonium 239, an isotope of element 94, by the interaction of neutrons and uranium. At the beginning, only predictions of its chemical and biological properties could be made since it is a new element. It was predicted that it would be toxic to tissue by virtue of its high atomic weight, and in addition, that it would be toxic by virtue of its radioactivity. Thus, the preparation and use… more
Date: May 8, 1947
Creator: Finkle, Raymond D.; Snyder, Robert H.; Jacobson, Leon O.; Kisieleski, Walter E.; Lawrence, Blanche. & Simmons, Eric L.
open access

Use of Redux Adhesives for Bonding Metal

Description: Redux is a thermosetting synthetic resin manufactured by the Resinous Products & Chemical Co., Washington Square, Philadelphia 5, Pa. According to the manufacturer, it is intended for bonding metal to metal and metal to wood. It was apparently intended to replace rivets in aircraft structural parts and recent information indicates that a British airplane, the DeHaviland Dove, is in production using this resin. The adhesive was originally developed in England by Aero research Ltd. Experience a… more
Date: May 20, 1947
Creator: Martin, M.
open access

The Emf of Cells with Uranium: Uranium Halide Couples in Fused Salt Electrolytes

Description: The emf of galvanic cells at high temperatures was measured using uranium metal in equilibrium with its chloride as one half of the cell, the other half of the cell being some reference electrode such as silver - silver chloride. Several designs of cells tried are described. A value of 2.83 volts/eq. at 1170[degree]K and also at 990[degree]K is considered as the most probably value for the potential of the uranium halide couple.
Date: July 31, 1947
Creator: Eastman, E. D. (Ermon Dwight), 1891-1945.; Campbell, J. A.; Cubicciotti, D. D. & Sienko, Michell J.
open access

Effects of Total Body Z Irradiation of Rats. Part I, Lethal Action of Single, Paired, and Periodic Doses

Description: Abstract: Exposure of Sprague Dawley white rats to single doses of 900 kvp X radiation demonstrated a medium lethal dose of 600 r which was not markedly dependent upon sex, weight, or, in the case of females, stage of the estrous cycle at the time of irradiation. Deaths within 30 days were most frequent between the fourth and eighth, and between the tenth and fifteenth post- irradiation days, indicating the existence of at least two processes leading to death in the "acute" period.
Date: June 17, 1947
Creator: Hagen, Charles W., Jr. & Simmons, Eric L.
open access

Acute Radiotoxicity of Injected Yttrium91

Description: Report describing results of experiments that involved injecting radioactive yttrium into animals: "The excretion, retention, and distribution of the yttrium was measured, and its effect on survival and growth was observed. The average total excretion of Y91 to the time of death (from 76 hours to 24 days) was a little less than 30 per cent of the injected dose" (p. 2).
Date: July 31, 1947
Creator: Anthony, David S.
open access

The Maintenance of Animals Containing Radioactive Materials

Description: Abstract: In the Biology Division, the maintenance of animals containing radioactive materials posed many problems. In addition to routine care of the animals, protection had to be provided for the personnel who worked with the contaminated animals. Frequent air changed in the room in which the animals were caged were necessary: farm workers were required to wear masks; animal cages were checked regularly for radiation; acid was used on the sawdust in the excrete pens; and a new, more efficient… more
Date: March 24, 1947
Creator: Britton, Paul; Lear, Patricia; Prosser, C. Ladd (Clifford Ladd), 1907-2002 & Tyree, Ella
open access

The Preparation of Cerium by Electrolysis of Molten Salts

Description: From abstract: "Electrolysis of cerium chloride or fluoride in the potassium chloride-lithium chloride eutectic mixture, or of cerium chloride in the calcium fluoride-lithium fluoride eutectic at 850° to 1000°C produces cerium metal in clean ingots in up to 80 per cent yield. Losses are chiefly due to oxyhalide formation in the presence of oxygen."
Date: 1947
Creator: Eastman, E. D.; Fontana, B. J. & Thurmond, C. D.
open access

Drawings of an Electrolysis Assembly

Description: The document consists of two photographs and ten drawing of an electrolysis assembly for electroplating radioactive samples and one drawing of a thin-window Beta-counter. Included are a cell support, an electrolysis cell, electrolysis cell cathode, cell rack, Geiger counter absorber slide, carrier for electrolysis cell cathodes, and a cover for electrolysis cell cathode carrier.
Date: January 12, 1947
Creator: Loevinger, Robert
open access

Physiological Observations on Rabbits Exposed to Single Doses of X-Rays

Description: Abstract: Most of the acute deaths among rabbits after single total-body x radiation occur in the first two days or at 10-15 days after irradiation. Signs of clinical depression are seen in survivors of sub lethal doses during each of these periods, termed the initial shock period and the principal acute radiation period.
Date: January 29, 1947
Creator: Painter, E. E.; Prosser, C. Ladd (Clifford Ladd), 1907-2002 & Moore, M. C.
open access

Velocity Analyzer

Description: Description of a velocity analyzer (with diagrams) is given. It is a device for measuring the velocities of charged particles which comprises pairs of spaced electrodes, a collector for charged particles, and means for propelling charged particles in a direction so as to pass between the pairs of electrodes. The pairs of electrodes and the collector are so arranged to permit passage of the charged particles between them to the collector plate. Means are provided for applying an alternating s… more
Date: April 2, 1947
Creator: Meecham, W. C.
open access

A Fast Coincidence Circuit with Pulse Height Selection

Description: Abstract: The output signal of a linear accelerator may have a rise time of 1-2 x 10[minus]7 seconds. Therefore, the output of a pulse height selector operating on this signal has a variation of delay from the original signal of about this amount. In the instrument to be described in this technical report this difficulty is largely resolved.
Date: April 22, 1947
Creator: Bell, P. B.; DeBenedetti, Sergio & Francis, J. B., Jr.
open access

Resonance Scattering of Neutrons by Mn55

Description: Abstract: Although we are generally interested in nuclear resonance levels, our measurements on Mn55 (naturally occurring Mn is 100 percent Mn55) were undertaken in order to corroborate Goldhaber's discovery of an extremely large scattering by this element.
Date: March 24, 1947
Creator: Seidl, F. G. P.; Harris, S. P. & Langsdorf, Alexander S., (Alexander Suss), 1877-1973.
open access

High Frequency Induction Heating

Description: Abstract: Equations are given to calculate at least approximately the heating in solid and hollow cylinders, slabs and spheres. Short and long cylinders are treated as well as short and long solenoids. The complicated mathematics used to derive the equations given will be omitted as they may be found in the original references. Heating with a spark gap converter is covered. Equations are given which together with some experimental data should enable the reader to predict the efficiency, heatin… more
Date: February 1, 1947
Creator: Bromley, LeRoy A.
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.
open access

Fraunhofer Diffraction Pattern Produced by a Slit of Varying Width and its Application to High Speed Cameras

Description: Abstract: "A theoretical and experimental investigation is made of the diffraction pattern produced by a slit, whose aperture varies uniformly from a constant value A to zero. The results of this investigation are applied to a proposed high speed camera. It is shown that diffraction effects are very serious and cannot be neglected. It seems, unless the suggested design of this high speed camera is changed, the camera will be of little use for accurate measurements, and photographs will show too… more
Date: November 11, 1947
Creator: Geiger, F. E. & Brixner, Berlyn
Back to Top of Screen