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The Bragg Reflection of Neutrons by a Single Crystal

Description: From cover page: This document has been assigned the above MDDC (Manhattan District Declassification) number, as given in the List of Declassified Documents issued semi-monthly by the Research Division, Manhattan District. In the case of Los Alapnos reports, LADC (Los Alamos Declassification) numbers are listed on the title page if known. This declassified document may differ materially from the original classified document by reason of deletions necessary to accomplish declassification. Hence, this copy of a declassified document does not constitute authority for declassification of classified copies of a similar document which may bear the same title and authors. Reference is made to District Circular Letter (Research Control 47-3) dated 31 October 1946, subject: "Instructions for Use of List of Declassified Documents," which outlines the procedure by means of which declassification of classified copies may be effected. Every effort has been made to reproduce with accuracy of detail the declassified document as certified for declassification. No corrections or changes have been made in the content of the document.
Date: June 14, 1946
Creator: Zinn, Walter H.
Partner: UNT Libraries Government Documents Department

The Multi-Channel Pulse Analyser

Description: This report discusses the multi-channel pulse analyser including its components and operation.
Date: June 14, 1946
Creator: Ghiorse, Albert; Weissbourd, B. & Robinson, H.
Partner: UNT Libraries Government Documents Department

Early Fluorocarbon Studies at Columbia University

Description: Development of certain liquid and solid fluorocarbon compounds with special properties.
Date: 1946
Creator: Cady, George H.; Burger, Leland L. & Barber, E. J.
Partner: UNT Libraries Government Documents Department

Experimental Techniques, Volume 1, Part 2: Ionization Chambers and Counters

Description: From foreword: "Construction of some typical ionization detectors and their operation, with most developed at the Los Alamos Laboratory and a few at other projects connected with the development of the atomic bomb." This report includes chapters 8-16 and an appendix to the second part.
Date: 1947
Creator: Rossi, Bruno Benedetto & Staub, Hans Heinrich
Partner: UNT Libraries Government Documents Department

Preparation of N-Polychloropolyfluoroheptane

Description: From introduction: "Discussion of alternate processes for manufacture of perfluoroxylene as insurance against any eventuality, e.g. disaster, poor quality, required amount of elemental fluorine not obtainable, necessity for further expansion at some future date, or decreasing cost."
Date: 1946
Creator: Babcock, J. H.; Beanblossom, W. S. & Wojcik, B. H.
Partner: UNT Libraries Government Documents Department

Sid Magnet Model Test Results

Description: From introduction: "These data were taken on a 1/16th scale model of the magnet shown on sketch no. FS-2. The object of these measurements was to get information that would determine the final design of the full scale magnet. The one main point to be settled was whether a tapered or a cylindrical pole piece would give the largest value of Hρ for a given power input into the magnet (the cylindrical pole piece is shown in dotted lines in sketch FS-2)."
Date: April 19, 1946
Creator: Sewell, Duane C., 1918-2008
Partner: UNT Libraries Government Documents Department

The Chemical Effects of Nuclear Transformations

Description: This technical report is divided into two sections addressing two different chemical effects of nuclear transformations. The first section discusses the beta decay of lanthanum to cerium. The second section discusses the beta decay of selenium to bromine.
Date: June 6, 1946
Creator: Coryell, Charles D. (Charles Du Bois), 1912-1971; Gest, H.; Edwards, R. R. & Davies, T. H.
Partner: UNT Libraries Government Documents Department

Mass Spectrometric Observation of C14

Description: This report describes observations of a sample of Carbon-14, or radiocarbon, made using the method of mass spectrometry.
Date: August 14, 1946
Creator: Ingrham, Mark G.
Partner: UNT Libraries Government Documents Department

The Metabolism of Thorium, Protoactinium, and Neptunium in the Rat

Description: From abstract: "The distribution of carrier-free thorium, protoactinium and neptunium in the rat following intramuscular and oral administration has been studied. Oral adsorption for all three is negligible. Following parenteral administration, the skeleton is the organ showing the highest degree of prolonged and selective localization."
Date: August 23, 1946
Creator: Lans, H.; Scott, E. G.; Crowley, J. & Hamilton, J. G.
Partner: UNT Libraries Government Documents Department

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

Report on Methods of Preparation of Inorganic Fluorides

Description: From abstract: "Frequently it has been desirable to prepare pure anhydrous metal fluorides. Several general methods have proved satisfactory depending on the type of fluoride to be prepared."
Date: November 11, 1943
Creator: Priest, H. F.
Partner: UNT Libraries Government Documents Department

Accumulation and Distribution of Radioactive Strontium, Barium-Lanthanum, Fission Mixture and Sodium in Goldfish

Description: This report details an experiment undergone to determine the amount of radioactive strontium, barium-lanthanum, fission mixture, and sodium accumulated by and distributed within non-feeding goldfish. The report includes tables detailing the findings.
Date: February 15, 1945
Creator: Prosser, C. Ladd (Clifford Ladd), 1907-2002; Pervinsek, William; Arnold, Jane; Svihla, George & Tompkins, P. C.
Partner: UNT Libraries Government Documents Department

A Mass Spectrograph for the Analysis of Fission Product Mixtures

Description: From introduction: "The analysis of mixtures of fission products with a mass spectrograph offers certain advantages. A chemical separation of the fission products found in the solution at Hanford is not necessary with the mass spectrograph technique. A sample of the mixtures can be placed on the sample holder and then the sample holder is mounted in the mass spectrograph. This reduces the amount of handling of the active solutions to one relatively simple and short operation. The health hazards involved in the analysis can be further reduced by increasing the efficiency of the spectrograph as much as possible, thus making possible an analysis of a sample of lower total activity. The mass spectrograph described here is an attempt to realize the advantages pointed out above. Particular attention has been given to increasing the increasing the efficiency of the instrument."
Date: June 12, 1946
Creator: Lewis, Lloyd G., 1917-
Partner: UNT Libraries Government Documents Department

Process Monitor, Mark 10, Model 20

Description: This report describes a specific apparatus used to monitor the intensity of gamma radiation. The report includes a diagram of the apparatus.
Date: August 17, 1946
Creator: Jesse, William P.
Partner: UNT Libraries Government Documents Department

Contributions to the Radiochemistry of 104 day Y88.

Description: From introductory paragraph: "The study of the counting techniques of gamma-emitting radioisotopes is of a great deal of interest to workers in the field of radiochemistry. Of particular interest to the long-lived gamma emitting isotope of yttrium which is commonly prepared by a deuteron bombardment of strontium and is reported to decay by K-capture. This isotope, which is of interest in the fields of biochemistry and metallurgy was tentatively assigned to mass 86. Since a 2.0 hour activity was observed from a neutron irradiation of yttrium, the assignment was considered fixed. Subsequent work indicated a possibility of a long-lived gamma emitting activity arising in the fast neutron irradiation of yttrium. The published data did not agree with theoretical calculations as to the possibility of these two activities being isomers. This work was undertaken to study the characteristics of the radiations from the isotopes; to have data available on the long-lived activity; and, to attempt to fix the mass assignment."
Date: September 20, 1946
Creator: Overman, Ralph T.
Partner: UNT Libraries Government Documents Department

Argonne National Laboratory Biology Division Quarterly Report: August to October, 1946

Description: From introductory paragraph: "This is the first quarterly report of the Biology Division of the Argonne National Laboratory. During the three-month period covered by this report, a large share of the time of many investigators has been spent in collating work done under the Biology Section of the Metallurgical laboratory for publication in the Plutonium Project Record. The large amount of work done under wartime pressure has made this, as in other divisions and projects, an important part of the transition to the post-war period."
Date: November 21, 1946
Creator: Bruss, Austin M.
Partner: UNT Libraries Government Documents Department

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

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

Theory of Pile Control Rods

Description: From abstract: "A control rod absorbs neutrons and increases the leakage of neutrons from the pile through the depression of the neutron density in its vicinity. To determine the effect of controls on critical conditions for a pile the absorber may be considered, as in the electrical analogue, to produce a singularity in neutron density at its position. The strength of such a singularity is determined by the boundary conditions which must be satisfied at the surface of the black or non-black absorber and the order of the singularity is determined by the geometry of the problem. The general solution of the pile equations can then be expressed by a sum of a regular solution plus the solution containing the proper singularities and this total solution can be adjusted to satisfy the boundary conditions. By this means the effect of control rods of various sizes and positions on pile reactivity and neutron distribution and the effects of mutual control rod shading have been investigated both by a thermal and by a two group theory."
Date: 1946
Creator: Scalettar, R. & Nordheim, L. W.
Partner: UNT Libraries Government Documents Department

A Critical Survey of Neutron Cross Sections

Description: From introductory paragraphs: "The central problems in neutron research are the understanding of nuclear structure and the study of the properties of nuclear particles, particularly the properties of the neutron. The most fruitful attack on these problems is the determination of the probability of interactions between neutrons and nuclei, i.e., the measurement of neutron cross sections. Ideally, this involves the study of all possible types of neutron interaction with all available nuclei at all neutron energies...The discussion in this paper will omit the interactions leading to neutron productions, and will be limited to the intersections of neutrons with stable nuclei."
Date: June 20, 1964
Creator: Goldsmith, H. H.
Partner: UNT Libraries Government Documents Department

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

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

Test Results on Bias Setting for the Chicago Scaler Offner Models

Description: Abstract: The counting accuracy of the Chicago Scalers, Models 961A and 961B, is a function of the bias setting of the limiter (V2). this report gives quantitative data supporting this thesis. A method of making bias settings is suggested. These tests were run at the suggestion of Mr. V. C. Hanson.
Date: September 11, 1944
Creator: Bradley, Wendell H.; Epstein, Bernard. & Wakefield, Ernest
Partner: UNT Libraries Government Documents Department

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