Search Results

open access

Test Results on Clinton Alpha Amplifier Used with an Offner Columbia Scaler

Description: Technical report describing development of the Clinton alpha amplifier. The circuit for the Clinton alpha amplifier which is used with an Offner scaler is shown attached to the report. It consists of a pre-amplifier mounted in a cylindrical alpha chamber, followed by a three state amplifier and a pulse height selector in a separate cabinet. Pulses are fed from the pulse height selector in the amplifier to the input tube of the Offner scaler. Through the third stage of the amplifier, this circuit is exactly the same as the California circuit now used by the chemical section for alpha counting. A type 961 Offner scaler was used for these tests. None of the latest Offner scalers type961A, were available to us when the tests were made. Method of testing is given, results are tabulated, computations are made, and eight graphs are given. it appears that the Clinton amplifiers used with a Offner scaler will give substantially the same performance as that given by the California circuit.
Date: July 1, 1944
Creator: Ostdahl, H. E.
Partner: UNT Libraries Government Documents Department
open access

Manufacturing Specifications for the Higinbotham Scaler

Description: Technical report which includes a description of scaling action in a Higinbotham circuit, of operation of the output circuit, of operation of the regulated high voltage supply. Acceptance and performance specifications are given. also included are cuts showing the bottom and top view of a scaler of this type. The scaling circuit diagram and major parts list is attached. To facilitate testing, the circuit of a satisfactory pulse generator is included together with a cathode - follower.
Date: November 9, 1944
Creator: Wakefield, Ernest
Partner: UNT Libraries Government Documents Department
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.
Partner: UNT Libraries Government Documents Department
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.
Partner: UNT Libraries Government Documents Department
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, heating, or temperature to be expected as the charge or coil is changed. Units and conversion factors are mentioned briefly.
Date: February 1, 1947
Creator: Bromley, LeRoy A.
Partner: UNT Libraries Government Documents Department
open access

Viscosities and Densities of Fluorolube Oils

Description: Abstract: Since the viscosity-temperature relationships of fluorocarbons are somewhat unusual, when compared to hydrocarbons, for example, it was decided to measure the viscosities, at several temperatures, of various fluorolube oils. The calculation of the viscosity of a blend of oils is at best an uncertain operation, varying considerably with the method used. A comparison of various methods was indicated, in order that reasonably accurate values might be assumed for theoretical composites. The densities were measured at corresponding temperatures for use in converting viscosities, and for their value, per se.
Date: April 28, 1943
Creator: Haendler, H. M.; Burger, L. L.; Sheldon, Z. D. & Barber, E. J.
Partner: UNT Libraries Government Documents Department
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
Partner: UNT Libraries Government Documents Department
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 sample is introduced into the chamber -- this sweeping out requiring only a few seconds. The mechanical construction is somewhat simplified over that employed in the Simpson counter design, although the electrical and counting characteristics are essentially duplicates of those employed in the Simpson version. Voltage plateaus about 400 volts long, flat within 1% per 100 volts are obtained with the counter, with the operating point at about 2500 volts for methane at one atmosphere pressure. A plateau extending over a range of about 40% variation in amplification factor is obtained. Standard samples have been checked to standard deviation of +/-0.3% over a period of one year. The counter is rather gas-tight and is ready for use within about ten minutes after the methane flow is first started. Thereafter counts may be started on samples with reliable results as rapidly as the samples can be changed. The small size of the whole chamber (less than 4" diameter overall) permits its use as a fission chamber inside one of the small channels in the thermal column of the pile. The sample is mounted upon the sample holder which is re-entrant from the outside (as shown) so as to have only 1/32"of metal between the sample and the outside. By allowing a bean of fast neutrons to enter the chamber through the re-entrant …
Date: July 9, 1947
Creator: Freedman, M. S.
Partner: UNT Libraries Government Documents Department
open access

Note on the Determination of Lead in Pitchblende

Description: Technical report describing a procedure for the determination of lead in pitchblende. The procedure was determined as needed in the course of an investigation of the processing of pitchblende for the production of uranium. Summary: The volumetric dichromate method for the determination of lead was selected from among several methods investigated as being best suited for a rapid determination of lead in pitchblende. The method as described is accurate to within 1% and it does not require the application of an empirical factor as suggested by Willard and Diehl for this determination.
Date: July 1946
Creator: Braddock, T. R.; Martin, G. L. & McCoy, J. R.
Partner: UNT Libraries Government Documents Department
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 of the element on a large scale meant the manipulation of, and possible exposure to, toxic quantities. It was, therefore, of practical importance to obtain data which would elaborate on the predicted toxicity. The objectives of the work reported here were to establish the acute toxicity of plutonium in experimental animals and to study the distribution of the element in the body after the administration of a wide range of doses. In the interest of economy of what was, at that time, a rare substance, and of animals and facilities, these two objectives were frequently pursued in the same experiment. The information obtained from the separate experiments is therefore frequently incomplete in one or another respect. An attempt has been made to present the data obtained in a number of experiments as a unit serving the above objectives. Most of the studies were made with the plus 6 valance state because of its intrinsic value and because it is easier to handle at relatively high pH. it is probably quickly converted to a lower valance state by the body fluids. Because of the importance of this new element and because of the number of problems which had to be investigated, concurrently, other groups in the project have studied phases of these and related problems.
Date: May 8, 1947
Creator: Finkle, Raymond D.; Snyder, Robert H.; Jacobson, Leon O.; Kisieleski, Walter E.; Lawrence, Blanche. & Simmons, Eric L.
Partner: UNT Libraries Government Documents Department
open access

Mass Spectrographic Analysis of Solids

Description: Technical report regarding he purpose of the investigation was to evaluate the Chicago mass spectrograph as an analytical instrument for solids.
Date: November 15, 1945
Creator: Garrison, Warren Manford, 1915-
Partner: UNT Libraries Government Documents Department
open access

Crystal Structure Studies of the System NaF-UF4, NaF-ThF4 and NaF-LaF3

Description: Abstract: In the NaF-UF4 system the following intermediate phases have been found: NaUF5, -Na2UF6, -Na2UF6 and NacUF7. NaLaF4 is the only intermediate phase observed in the system NaF-LaF3. In the course of an incomplete study of the system NaF-ThF4 the phases NaTh2F9, -Na2ThF6, -Na2ThF6 and Na4ThF8 have been observed. Crystal structure data are given for all the phases.
Date: August 1946
Creator: Zachariasen, William H. (William Houlder), 1906-1979
Partner: UNT Libraries Government Documents Department
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 at this laboratory has been confined to use of the resin for bonding electrical grade silicon steel laminations. Very strong bonds have been obtained under properly controlled conditions. The bond strength is sufficient to tear 29 gauge (.014") steel when attempting to peel off individual laminations. The bond is sufficiently homogeneous to prevent leaks parallel to the plane of the laminations into a high vacuum system. Experiments at the laboratory have been designed to test the adhesive for use in bonding the laminations which form the pole tips and vacuum chamber lids for the synchrontron magnet.
Date: May 20, 1947
Creator: Martin, M.
Partner: UNT Libraries Government Documents Department
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.
Partner: UNT Libraries Government Documents Department
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.
Partner: UNT Libraries Government Documents Department
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 type of cage was designed. The most import feature of the new cage was that the support for the screen floor was outside the confines of the cage. Stainless steel was the preferred metal for case construction. Photographs and working drawings of cages for mice, rats, guinea pigs, rabbits, and goats, and several types of metabolism cases are included in this paper. Cage decontamination was accomplished with the aid of complexing agents such as citric acid or sodium tartrate. Under certain conditions, nitric acid was used.
Date: March 24, 1947
Creator: Britton, Paul; Lear, Patricia; Prosser, C. Ladd (Clifford Ladd), 1907-2002 & Tyree, Ella
Partner: UNT Libraries Government Documents Department
open access

Hydrodynamic Theory of the Reaction Zone in High Explosives

Description: From introduction: "The first part deals with stationary detonation waves...the second part is concerned with the structure of detonation waves of finite age...the third part deals with the steady state motion attained by a detonation wave in certain cases of two-dimensional flow."
Date: 1946
Creator: Skyrme, Tony Hilton Royle, 1922-1987
Partner: UNT Libraries Government Documents Department
open access

The Statistics of the Hypocritical Water Boiler

Description: From introductory paragraph: "In a slightly hypocritical water boiler the introduction of a single neutron may give rise to a fairly large burst of neutrons which dies out slowly. As was shown some time ago by Frankel and Nelson with the help of A. Horn the statistics of this multiplication process can be treated in a simple way for the hypothetical case that the number of neutrons produced per fission is two."
Date: January 8, 1944
Creator: Frankel, S. P.
Partner: UNT Libraries Government Documents Department
open access

The Preparation of Tungsten Hexafluoride

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

Comparative Effectiveness and Additivity of Fission Neutrons Gamma Rays and Beta Rays of Drosphila Eggs

Description: From abstract: "Some investigations have been made to ascertain the similarity of the mechanism of action of radiation which are different in their specific ionization. A suggested approach was to determine if the energies absorbed from the different types of radiation are additive in their lethal effects on biological objects. In an attempt to determine the additivity of ionizing radiation various dose combinations of fast neutrons, gamma rays and beta rays were administered to Drosophila eggs. These test objects were chosen because their dimensions are such that they tend to absorb these three radiations uniformly throughout their volume. Although the three radiations were found to vary in their biological effectiveness, per unit energy absorbed, all three were shown to be completely additive in their lethal effect on these organisms."
Date: February 1946
Creator: Stapleton, G. E. & Zirkle, Raymond E. (Raymond Elliot), 1902-1988
Partner: UNT Libraries Government Documents Department
open access

The Quantitative Estimation of the Activity of Beta Particle Emitters

Description: From abstract: "In estimating the activities of β-emitting materials used in the Biology Section, most measurements were made with Geiger-Mueller counters, although Lauritsen electroscopes were used in early work. All samples were mounted on flat porcelain capsules."
Date: October 3, 1946
Creator: Zinn, Walter H. (Walter Henry), 1906-2000; Broido, Abraham; Nordeen, Clifford & Himmelstein, Sheldon H.
Partner: UNT Libraries Government Documents Department
Back to Top of Screen