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The Diffusion Length and the Utilization of Thermal Neutrons in a Heterogeneous Pile

Description: Abstract: "An accurate calculation is given for the quantity which corresponds to the diffusion length in the theory of the pile. The procedure is to establish a relationship between the diffusion length and the change in thermal utilization from a pile with infinite sides to one with sides of a finite length. The calculation of this change in the thermal utilization is then carried through. Approximation to the answer and numerically exact calculations are given in the report. The results show… more
Date: October 6, 1943
Creator: Plass, Gilbert N.
Partner: UNT Libraries Government Documents Department
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Report on Reserves and Production Situation of Vanadiferous and Related Ores in Colorado Plateau Region

Description: From introduction: The general distribution of known deposits of vanadium-bearing sandstone, which also contain some uranium and radium, is shown in figure 1 1/ and Exhibit A, plate 53. 2/ During 1939-41 the Geological Survey made detailed geological studies of these deposits in the Uravan district, Montrose County, Colorado, as well as preliminary examinations in other parts of the Colorado Plateau vanadium region. In 1942 detailed geological studies were made o the deposits in the Egnar-Slick… more
Date: October 10, 1943
Creator: Fischer, Richard P. & Stokes, William Lee
Partner: UNT Libraries Government Documents Department
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Studies on the Determination of Carbon by the Low Pressure Combustion Method

Description: Technical report: The apparatus for the low pressure combustion method of determining carbon in iron and steel has be redesigned to increase the speed of manipulation. It has been tested by running several thousand determinations and found to yield results in good agreement with Wooten's form of the apparatus. A detailed description of the equipment and its manipulation is given together with an account of experimental studies on the method. Results are also shown for the carbon content of c… more
Date: October 20, 1943
Creator: Murray, W M., Jr. & Ashley, S E. Q.
Partner: UNT Libraries Government Documents Department
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Introduction to Diffusion Theory and to Pile-Theory

Description: The following report describes and foretells the situation in medium in which neutrons are being (a)produced as fast neutrons, (b) slowed down to thermal speeds by impacts with nuclei, and (c) absorbed by nuclei in such a manner that sometimes fresh fast neutrons appear at the place where a thermal neutron has just appeared.
Date: October 5, 1944
Creator: Darrow, Karl K.
Partner: UNT Libraries Government Documents Department
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The Thermal Conductivity of Liquid UF6

Description: From introduction: "The measurement of the thermal conductivity of liquid TF6 presented unusual difficulties because of two of its properties which necessitated working with a closed system. The properties were (1) the liquid can exist as such only above 64.05°C. at which temperature its saturated vapor pressure is 1140 mm. of mercury, and (2) the compound reacts rapidly with moist air. Also because of the liquid's extremely corrosive nature, it was necessary to design a cell of special corrosi… more
Date: October 11, 1944
Creator: Priest, Homer F.
Partner: UNT Libraries Government Documents Department
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The Wigner Effect in Graphite, Relationship Between Advantage Factor and Location of Samples in an Operating Pile

Description: Technical report. The extent of the Wigner effect in graphite at any point in a pile is sensitive to the local structural situation. It is greater near a slug. These control experiments give information on changes in graphite to be expected in selected places in the pile.
Date: October 20, 1944
Creator: Novick, A.; Neubert, T. J. & Burton, Milton, 1902-
Partner: UNT Libraries Government Documents Department
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A Study of Thorium Peroxide Sulfate

Description: Abstract. Thorium peroxide was precipitated from thorium nitrate solutions containing varying amounts of sulfate ion and of hydrogen ion. The washed solids were analyzed both wet and dry. Analyses were made for thorium, peroxide oxygen, sulfate, nitrate, and water contents. X-ray powder photographs of the dried samples by W.H. Zachariasen showed the presence of only two phases. When precipitated from high sulfuric acid, the solid phase was isomorphous with Th(OO)SO4.3H20. More weakly acid … more
Date: October 1, 1945
Creator: Hamaker, John W.
Partner: UNT Libraries Government Documents Department
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Analysis of Uranium-Manganese Alloys

Description: Introduction. the conventional procedures of analysis for uranium and manganese can be employed in the analysis of alloys of these metals. The alloys are reacted with perchloric acid and hydrogen peroxide, fumed to remove any chloride ions, diluted to volume and aliquots analyzed by redoximetry.
Date: October 5, 1945
Creator: Ayers, A. S.
Partner: UNT Libraries Government Documents Department
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Precipitation of Thorium Oxalate from Nitric Acid Solutions

Description: Introduction. It has been known for a long time that thorium is precipitated by oxalic acid in acid solutions, but a survey of the literature showed no study of the limits of the acidity and oxalic acid excess which yield quantitative results. V. I. Spitzin reports on the solubility of thorium oxalate in varying concentrations of several acids, but the effect of an excess oxalic acid is not included. Since solutions are sometimes presented for analysis that contain more than the recommended … more
Date: October 5, 1945
Creator: Ayers, A. S.
Partner: UNT Libraries Government Documents Department
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Recovery of D2O and UO2F2 by Distillation

Description: Technical report describing the purification and separation by distillation of UO2F2 from D2O. In the experiment which is discussed 2,129.6 lbs of UO2F2 were dissolved in 6,605 lbs of D2O. The average isotopic purity of the D2O decreased during the distillation from 99.77% to 99.73%. The dissolved impurities were less than those present originally in the heavy water.
Date: October 10, 1945
Creator: Fischer, R. & Wattenberg, Albert, 1917-
Partner: UNT Libraries Government Documents Department
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Preparation and Stability of Cobalt Trifluoride

Description: Report discussing the preparation, stability, and recommended storage of cobalt trifluoride. "Cobalt trifluoride prepared by the action of fluorine upon anhydrous cobalt dichloride remains stable when kept in sealed glass tubes but on exposure to air it absorbs water and its use in the conversion of T3O8 to TF6 cannot be relied upon..."
Date: October 15, 1945
Creator: Whitney, J.; Smith, Fred & Miller, A. J.
Partner: UNT Libraries Government Documents Department
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Range of U235 Fission Fragments in Photographic Emulsion

Description: From abstract: "A fine-grain emulsion has been found which is sensitive only to the densely ionizing fission fragments. This emulsion was soaked in uranyl acetate and exposed to slow neutrons. The ranges in the emulsion of about four-hundred fission fragments were measured. The resulting distribution shows a sharp maximum at 23 microns of emulsion. No ternary fissions or large-angle scattering of fragments were observed."
Date: October 17, 1945
Creator: Richards, H. T.
Partner: UNT Libraries Government Documents Department
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The Production of Ceramic Ware by Slip-Casting

Description: This report discusses the production of ceramic ware through the process of slip-casting. The report separately describes the processes of creating zirconia ware, beryllia ware, alundum ware, thoria ware, and specially shaped ceramic ware.
Date: October 20, 1945
Creator: Calderwood, Wayne
Partner: UNT Libraries Government Documents Department
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Equations Used for Calculation of Data by the Feedback Method

Description: The following report studies a method of assay where an unknown sample is determined by comparison with a standard sample of known isotopic ratio. The purpose is to acquaint the technical personnel with the fundamentals of the feedback method of assaying samples of TF6.
Date: October 26, 1945
Creator: Happ, G. P. & Cameron, A. E.
Partner: UNT Libraries Government Documents Department
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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
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Radiocarbon from Pile Graphite; Chemical Methods for its Concentration

Description: Abstract. Samples of pile graphite, irradiated in a test-hole at Hanford for 15 months, have been assayed for radioactive C14, yielding 0.38 ± 0.04 microcuries per gram. At this level of activity, the pile graphite contains very valuable amounts of C14. The relation between the above assay and the probable average assay of pile graphite is discussed, and it is concluded that the latter is almost certainly above 0.3 uc/ gram. Controlled oxidation of this graphite, either with oxygen at ~ 750°C,… more
Date: October 10, 1946
Creator: Arnold, James R. & Libby, Willard F.
Partner: UNT Libraries Government Documents Department
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The X-Ray Spectra of the Last-Row Elements

Description: Abstract: X-ray energy level diagrams as given in the literature are tabulated for radium, thorium and uranium. A level scheme for protoactinium is derived from the published data. After a brief review of the use of X-ray data in studying outer electronic structure, it is pointed out that differences in the X-ray spectra should exist depending on whether the outer electrons are in f or d orbitals. The observed separation of the OI and OII levels in thorium and uranium indicated that the f lev… more
Date: October 22, 1946
Creator: Russell, H., Jr.
Partner: UNT Libraries Government Documents Department
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Metabolism and Distribution of Inhaled Plutonium in Rats

Description: From abstract: "Several different techniques were used to introduce tracer quantities of plutonium into the lungs of rats. When aerosols were produced by atomizing aqueous solutions of the nitrates it was found that approximately 20 per cent of the dose was absorbed and deposited in the skelton [sic] with tetra-, hexa-, and trivalent plutonium. Thus with these compounds, the lungs represent a more dangerous portal of entry than either oral (0.05 per cent) or intramuscular (13 per cent) administ… more
Date: October 29, 1946
Creator: Abrams, Richard; Siebert, H. C.; Potts, A. M.; Forker, L. L.; Greenberg, D.; Postel, A. et al.
Partner: UNT Libraries Government Documents Department
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The Hematological Effects of Ionizing Radiations

Description: This report follows the hematological studies conducted on the Plutonium Project. The studies focus on the internal and external effects of plutonium radiation on biological features, applying these effects toward the protection of individuals who worked in the Project, and using the findings generally for the protection of the public which was potentially in danger of exposure to these physical hazards.
Date: October 1947
Creator: Jacobson, Leon O.; Marks, Edna K. & Lorenz, Egon
Partner: UNT Libraries Government Documents Department
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A Method for the Determination of Traces of Metals III : Studies of the Distillation of Amalgams

Description: Summary: "It has been demonstrated that the electrolysis-distillation stages of the procedure that has been developed for traces of metals may be utilized, with certain precautions, to recover milligram quantities of cadmium, cobalt, copper, iron, nickel and zinc. Lead remains partially as undissolved lead sulfate and hence the recovery of amounts ranging from 1 - 5 mg. is not advisable by this procedure."
Date: October 1947
Creator: Bricker, Clark E.; Furman, N. Howell & McDuffie, Bruce
Partner: UNT Libraries Government Documents Department
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A Method for the Determination of Traces of Metals: [Part] 1. Outline of the Method

Description: Updated report about work that originated in February 1942 for the purpose of determining minor amounts of cadmium in uranium and related materials. A method was developed over a long series of studies made following the original report for determining small amounts of various materials in uranium and in a variety of other materials.
Date: October 1947
Creator: Bricker, Clark E.; Furman, N. Howell & McDuffie, Bruce
Partner: UNT Libraries Government Documents Department
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