198 Matching Results

Search Results

Advanced search parameters have been applied.

Preliminary Studies of Scavenging Systems Related to Radioactive Fallout. Letter Report No. 10 for October 1 to December 1, 1959

Description: Progress is reported in the development of scavenging systems for the collection of fall-out. Data are included from tests of two cyclone separators for the collection of air samples. Results are included from laboratory studies on the scavenging of aerosol particles by evaporating and condensing water droplets. (C.H.)
Date: December 18, 1959
Creator: Stockham, J. & Rosinski, J.
Partner: UNT Libraries Government Documents Department

Transformations in uranium-base alloys : summary report, December 14, 1955 - March 31, 1957

Description: From abstract: "Transformation kinetics of binary U -Nb and ternary U-Nb-base alloys were investigated. Additions included zirconium, chromium, titanium, silicon, nickel, nnthenium, and vanadium. Encapsulated samples were given a homogenizstion anneal at 1000 or 1100/sup o/C, water-quenched from 906/sup o/C to retain the phase, and reheated to temperatures between 360 and 600/sup o/C. The metastability of the phase was examined by metallographic, hardness, resistometric, dilatometric and x-ray-diffraction techniques. The U -Nb system is characterized by a monotectoid decomposition of the high temperature allotrope at about 645/sup o/C to form alpha and ₂, a niobium-rich cubic structure. Decomposition in U-Nb and in most U-Nb-X alloys occurred by a continuous precipithtion of alpha from the body-centered cubic phase with a resultant enrichment in niobium of until the equilibrium ₂ composition was reached. In the U-Nb-Ti and U-Nb-V systems, alpha and /sub 2/ were coprecipitated. Annealing at 550 and 600/sup o/C produced decomposition products which, in most materials, originated at the grain boundaries; a fine precipitate which initiated throughout the matrix was observed at lower annealing temperatures. Increasing the niobium content resulted in greatly increased stability. The following elements added to a U-Nb base were found to retard transformation of the phase: zirconium, chromium, ruthenium, and vanadium. Additions of titanium, silicon, and nickel produced alloys which were less stable than the U-Nb base to which they were added. Cold-working a U-7 wt. % Nb-2 wt. % Zr composition caused a more rapid transformation upon annealing at 360 and 450/ sup o/C, and the resulting microstructures were different. Continuous cooling transformation studies were conducted on U-10 wt. % Nb materials, solution annealed at 700 and 950°C, and cooled at various linear rates to temperatures between 300 and 600/sup o/C. Cooling rates between 8.5 and 14.5/sup o/C per minute were required to prevent transformation of ...
Date: 1957
Creator: Parry, Sidney J. S.; Holtz, F. C. & Van Thyne, R. J.
Partner: UNT Libraries Government Documents Department

[Aerosol Generator Design] : Letter Report

Description: The following report provides information on an aerosol generator fit to produce fine particles by a vaporization-condensation technique. Included is a diagram of the essential components of the generator.
Date: October 19, 1960
Creator: Rosinski, John & Stockham, John D.
Partner: UNT Libraries Government Documents Department

Contaminant effects study : final report, January 5 to September 15, 1962

Description: From abstract: "This report describes work done on ARF Project C 216 from January 5, 1962 to September 15, 1962. The objectives of the program include evolution of an analytical research program to evaluate effects of environment contributed contamination on precise devices"
Date: November 14, 1962
Creator: Lieberman, A.
Partner: UNT Libraries Government Documents Department

Magnetic Recorder for Nuclear Pulse Application. Period Covered: October 6, 1959 to December 5, 1959

Description: Data on analog magnetic tape charactcristics are presented along with results from conventional and modulator playback system operational tests. Theoretical considerations imply that the modulator head should be loss sensitive to short term variations in record and playback tape speed. It is also pointed out that although a tape recorder operating at 7.5 in./sec has only 12 kcs bandwidth for sinusoidal wave forms. the record and play-back amplifiers for pulse recording can operate with other bandwidths. These amplifiers must be capable of passing a square wave with a frequency of 1.5 kcs. A square wave of such frequency represents the condition of 350 microsecond pulses with a 700 microsecond period. (J.R.D)
Date: December 14, 1959
Creator: Burgwald, G. M. & Norton, R. M.
Partner: UNT Libraries Government Documents Department

Stress-Dependent Interactions Between Cesium and Other Materials. Summary Report, February 15, 1962-February 15, 1963

Description: Metals and alloys germane to thermionic energy converter usage were screened for embrittlement by liquid cesium. Techniques are described for more detailed studies of ceramics and susceptible metals. Definite reductions in tensile ductility were observed for 302 stainless steel and molybdenum. Bend ductility was lowered in titanium, titanium-8 aluminum-4 vanadium alloy, niobium, tantalum, and silver-- copper eutectic solder. Some difficulty in reproducibly wetting samples was evident. Slightly contaminating the cesium with oxygen (or water) was observed to increase cesium wettability. (auth)
Date: March 22, 1963
Creator: Levinson, D. W.
Partner: UNT Libraries Government Documents Department

STUDIES OF REACTOR CONTAINMENT. Bimonthly Progress Report, September- October 1962

Description: A computer program is being developed for the solution to propagation of stress waves generated in a onedimensional, homogeneous material subjected to an impulse loading. A stress sensor is being used for the determination of the unloading isentropes of balsa. The problem of explosive decompression of reactor coolant water is discussed. (R.J.S.)
Date: October 31, 1963
Creator: Lieberman, P.
Partner: UNT Libraries Government Documents Department

Studies of Reactor Containment. Task No. 6 on Explosives Test Evaluation of Blast Shields for Nuclear Reactors. Report No. 1. A Technique for the Observation and Measurement of the Behavior of Porous Materials When Rapidly Compressed

Description: The technique described may be used to obtain data regarding the behavior of porous media when they are rapidly compressed. Data which can be obtained include relationships between stress and strain under dynamic conditions, coefficients of restitution, compression wave velocities, decay rates and wave form modifications. Although there is still room for improvement and refinement, the present technique can be used to produce data needed by, and not previously available to, designers of blast shields and similar structures. The data presented herein are preliminary, included mainly to illustrate the usefulness of the technique. It may be noted, however, that they leave little room for doubt regarding the value of porous materials in the absorption of shock energy. The coefficients of restitution are velocity ratios. Since the kinetic energy varies as the square of the velocity, between 90 per cent and 96 per cent of the initial kinetic energy was absorbed in the cases cited. (auth)
Date: August 1, 1958
Creator: Napadensky, H. S.; Pinsky, J. & Stresau, R.
Partner: UNT Libraries Government Documents Department

STUDIES OF ZIRCONIUM-IRON-TIN ALLOYS. Report No. 6 (Final) for July 1, 1958-March 31, 1959

Description: The intermetallic compounds of the zirconium-irontin system (i.e., ZrFe/ sub 2/ and Zr/sub 4/Sn) were studied at 500 and 1100 C. The alloys were prepared from iodide zirconium and high-purity iron and tin by nonconsumableelectrode arc melting techniques under an inert atmospherc. Specimens were encapsulated in Vycor and annealed at the prescribed temperatures followed by a water quench. Data were gathered through the use of metallographic, x-ray diffraction, visible incipient melting, and magnetic susceptibility techniques. It was determined that Zr/sub 4/Sn (24.5 wt.% Sn) and (24.5 wt.% Sn and 7 to 8 wt.% Fe) are separate phases which are not in equilibrium with each other. ZrFe/sub 2/ was firmly established at its stoichiometric composition of 55 wt.% Fe, and it apparently has negligible solubility for tin. The specific magnetization of this ferromagnetic compound is of thc order of 55 cgs at room temperature. Its Curie temperature is about 355 C. (auth)
Date: April 30, 1959
Creator: Tanner, L.E. & Simcoe, C.R.
Partner: UNT Libraries Government Documents Department

Synthesis of Refractory Mixed Oxide With Perovskite Structure. Bi-Monthly Report No. 2 for the Period July 24, 1960 to September 24, 1960

Description: Experimental work on the preparation and measurement of BaThO/sub 3/ shows that the compound exists and is the most stable compound in the Ba-Th-O system. It is cubic at ordinary temperature, with the perovskite structure, and has a crystal density of 4.59 g/cc. The compound may be prepared from a coprecipitated mixture of the barium and thorium oxalates at 750 deg C, and the reaction is driven to completion below 1000 deg C in the presence of an excess of barium. BaThO/sub 3/ appears to hydrolyze readily in the presence of moisture and/or CO/sub 2/. It does not, therefore, appear to have the chemical stability required in a protective coating, and it is inadvisable to measure other coating parameters at this time. It may, however, serve as a superior thermionic emitter. (auth)
Date: October 31, 1961
Creator: Harada, Y. & Bradstreet, S. W.
Partner: UNT Libraries Government Documents Department

The System Zirconium-Iron-Tin. Status Report No. 4 for July 1, 1957- March 31, 1958

Description: A study of the solubility limits of iron and tin in alpha zirconium at temperatares below 500 deg C is in progress. Dilute alloys were prepared by arc- melting using the highest purity materials. Heat treatment of the alloys involves homogenizntion at 800 deg C followed by severe cold work prior to extended anneals at temperatures between 200 and 500 deg C in 50-degree intervals. Metallographic examination of annealed and quenched structures is the primary mode of investigation. Some magnetic susceptibility studies were also made. (auth)
Date: April 24, 1958
Creator: Tanner, L. E.
Partner: UNT Libraries Government Documents Department

The System Zirconium-Iron-Tin. Summary Report No. 5 for July 1, 1957-- June 30, 1958

Description: The zirconium --iron--tin system was investigated up to the first compound in each binary system (ZrFe/sub 2/ and ZrSn) between the temperatures 500 and 1100 deg C. A careful study of the solubility of iron and tin in alphazirconium was also made betwen the temperatures 200 and 800 deg C. The alloys were prepared from ''Grade ''r iodide zirconium (as received and electron bombardment melted) and high purity iron and tin by nonconsumable-electrode are melting techiques under an inert atmosphere. Ingots were homogenized, cold worked when possible, cut or broken into small specimens, and given equilibration anneals at the prescribed temperatures, Metallographic examination of the heat treated and quenched samples was the main method of investigation- X-ray diffraction and magnetic susceptibility techniques were also employed. The results of this program are summarized in 12 partial isothermal sections. The important features of the system indicate that there is little-solubility for tin in the compound ZrFe/sub 2/ The single-phase field is believed to exist in the vicinity of 55 wt, % Fe, The compound theta appears to be a continuous phase originating at the binary compound ( Zr/sub 4/Sn) and dissolving up to about 7.5 wt. % Fe while maintaining a constant tin composition of the order of 24.5 wt. %. A four-phase ternary eutectic (L in equilibrium BETA +i THETA + ZrFe/sub 2/) occurs ' between 930 and 935 deg C. It is likely that a four-phase ternary peritectoia ( BETA + THETA in equilibrium alpha + ZrFe/sub 2/) occurs at a temperature just above the binary zirconium-iron eutectoid (which takes place between 790 and 800 deg C). A four-phase ternary eutectoid ( BETA in equilibrium alpha THETA + ZrFe/sub 2/ taking place just above the zirconium - -iron eutectoid remains an alternate possibility. The solubility limit of alpha- zirconium was ...
Date: July 29, 1958
Creator: Tanner, L. E.
Partner: UNT Libraries Government Documents Department

Toxicology of Aurin Tricarboxylic Acid and Its Antidotal Effectiveness Against Beryllium

Description: Monkeys and dogs were used in a series of studies designed to assess the ability of aurin tricarboxylic acid (ATA) to provide protection against acute beryllium poisoning. The acute LD/sub 50/ of ATA was found to be 344 mg/kg for monkeys and 164 mg/kg for dogs. Neither species exhibited significant hematological changes when given weekly ATA doses of 25 mg/kg over an 8-month period. The lethal intravenous dose of beryllium sulfate was 0.6 mg/kg for both dogs and monkeys, but the value increased to between 1 and 3 mg/kg when given by intratracheal injection. Acute toxic effects were not observed by either intravenous or intratracheal doses of suspensions of beryllium oxide. Treatment with ATA appeared to have therapeutic value in monkeys exposed to beryllium, but no significant response was observed in dogs. (auth)
Date: December 1, 1961
Creator: King, M. E.
Partner: UNT Libraries Government Documents Department

ULTRASONICS AND CERAMIC COATINGS. Quarterly Progress Report No. 2 for July 1 to September 30, 1960

Description: The objectives of the program are to develop ultrasonic methods of determining ceramic-metal bond strength and uniformity. Promising results were obtained using simple scanning and display systems to detect simulated defects. Two different methods were tried, one using solid specimens with the crystals directly attached and the other using specimens immersed in a liquid couplant with the crystals held in precise parallelism with the specimen surfaces. Equally good results were obtained in either case. Further experiments using surface waves and coatings with lower ultrasonic absorption have indicated that the proposed surface wave technique might be useful for vaper-deposited coatings. The experiments showed that the absorption of ultrasonic energy by ZrO/sub 2/ coating prevents the use of surface wave methods. Two simple systems were used to investigate the correlation between logarithmic decrement and bond condition. (W.L.H.)
Date: October 31, 1961
Creator: Lawrie, W.E.
Partner: UNT Libraries Government Documents Department

AN IMPROVED NUCLEAR DENSITY GAUGE. Period covered: September 2 to October 1, 1959

Description: Progress in development of a nuclear density gage for use in thickness and density measurements is reported. A Ross filter system for energy discrimination in the alpha ray region was constructed. Soller slits for collimating the radiation entering and leaving the filters so that a constant absorber thickness is seen by the radiation beam is under construction. Comments by visiting Russian scientists on the density gage and a discussion of their work in this area are included. (J.R.D.)
Date: October 31, 1960
Creator: Burgwald, G.M.
Partner: UNT Libraries Government Documents Department

An Improved Nuclear Density Gauge. Quarterly Report No. 2 Covering Period September 1 to December 1, 1959

Description: Techniques for improving stability of scintillation counter chopper systems and their development for use in industrial control applications are being investigated. Tests are being performed to determine the causes of fluctuations. An integration and frequency converter is being developed in which the anode current of the photomultiplier tube is alternately switched between two integrating condensers by action of a commutator switch. The voltages developed across the two condensers are proportional to the respective intensities of the two radiation beams seen by the scintillation counter. Slective sampling by the use of Loss filters is scheduled for future investigations and a literature search on counter stabilization is also planned. (J.R.D.)
Date: October 31, 1960
Creator: Burgwald, G. M.
Partner: UNT Libraries Government Documents Department

AN IMPROVED NUCLEAR MEASURING PRINCIPLE. Quarterly Progress Report No. 3 Covering the Period from December 1, 1959 to March 1, 1960

Description: The scintillation counter has proven to be a very valuable research tool, but urfortunately, its ability to meet necessary stability requirements has restricted its use in industrial applications. Several techniques are being investigated which cancel out reasonable variations in detector sensitivity, resulting in improved stability. The general technique consists of alternately measuring the intensity transmitted through the sample and through a calibrated absorber, and difference in intensity causing the calibrated wedge to re-position itself. A comparison of commutating and noncommutating systems is made and other applications of scintillation counter systems are discussed. (For preceding period see ARF-1152-6.) (W.D.M.)
Date: March 28, 1960
Creator: Burgwald, G.M.
Partner: UNT Libraries Government Documents Department

IMPROVED ZIRCONIUM ALLOYS. Quarterly Report, January 1, 1963-March 31, 1963

Description: On the basis of 4800 hr exposure to 680 l F water, a number of ternary compositions were shown to have corrosion resistance superior to Zircaloy-2. In addition, the strength and hydrogen pickup properties of the alloys were generally improved over Zircaloy-2. The promising alloys were based on the binary materials Zr- 1Sb, Zr- 1Cr, Zr0.5Nb, and Zr-0.5Sn to which small percentages of Te, Ge, Cr, or Fe were added. At present, 680 l F water corrosion data for an exposure time of 5000 hr are available for the modified ternary alloys. Development of materials for potential service in 750 and 900 l F steam proceeded in a manner similar to that for 680 l F water application. On the basis of corrosion resistance and strength, the alloys Zr3Cr- 1Fe, Zr-3Cr- 0.25Te, and Zr- 1V- 1Fe were considered highly promising and initially acceptable. However, hydrogen pickup properties, which were about the same as Zircaloy-2, were judged as unacceptable. In an attempt to improve this characteristic as well as to further enhance corrosion resistance and strength, an additional series of ternary alloys was prepared. The compositions studied in 900 l F steam did not exhibit satisfactory corrosion resistance. (P.C.H.)
Date: April 10, 1963
Creator: Weinstein, D. & Holtz, F.C.
Partner: UNT Libraries Government Documents Department

IMPROVED ZIRCONIUM ALLOYS. Quarterly Report, October 1, 1962-December 31, 1962

Description: A number of ternary compositions were developed for service in 680 deg F water which meet the objectives of a zirconium alloy improvement program on the basis of corrosion resistance, strength, and hydrogen pickup. These are compositions based on Zr-- 1Sb, Zr-- 1Cr, Zr--0.5Nb, and Zr--0.5Sn with minor additions of Te, Ge, Cr, or Fe. In 750 deg F steam, the materials Zr--3Cr-1Fe, Zr--3Cr--0.25Te, and Zr-- 1V--1Fe are initially acceptable on the basis of corrosion resistance and strength; however, hydrogen pickup is excessive. The current work is for the study of ternary alloys which are intended to show an optimum combination of corrosion, strength, and hydrogen-pickup properties. (auth)
Date: January 10, 1963
Creator: Weinstein, D. & Holtz, F.C.
Partner: UNT Libraries Government Documents Department

INVESTIGATION OF GRAPHITE BODIES. Progress Report No. 4 for period June 1, 1959 to August 31, 1959

Description: Preliminary data are presented illustrating the properties of molded multicrystalline graphite made using calcined petroleum coke (in some instances mixed with a thermal carbon) bonded with coal tar pitch, furfuryl alcohol, or limited mixtures of the two. No conclusions have yet been drawn regarding the relation between these properties, since a large number of specimens remain to be measured. Most obvious is the difficulty of achieving a sound structure from bodies of maximum green density, particularly when the binder is not thermoplastic. Graphitized specimens made with furfuryl alcohol reflect the high density of the binder coke. Xray data show that this coke is poorly graphitizable as compared to pitch; modulus and electrical resistance data show it to be more dense. A full description of the use of differential thermal analysis and dilatometry in investigating the behavior of thermosetting resins is appended. For preceding period see ARF-6039-3. (auth)
Date: September 1, 1959
Creator: Bradstreet, S.W.
Partner: UNT Libraries Government Documents Department

Irradiation Testing of Operating Electronic Equipment by Fast Neutrons and Gammas. Final Report

Description: A study of the radiation effects of fast neutrons (O.5 ev to about 15 Mev) and gamma rays (fission spectrum) on various pieces of aircraft instrumentation is re ported. Components studied were: fuel gage vacuumtube amplifier and indicator, transistorized (germanium and silicon) servo amplifier system, and 4-in. diam. gyro. The fuel gage was subjected to a total neutron flux of about 6 x 1O/sup 5/nvt and about 5 x 1Osup 8/ r gamma with no adverse electrical effect. Physical damage was evident. Four transistorized amplifiers were irradiated in a fast flux of about 1.0 x 10/sup 10/cm/sup 2/ sec. Rapid loss in gain, rapid increase in d-c current drain, and complete failure occurred when the integrated flux reached about same flux. Studies on the gyro were inconclusive due to equipment failure. (auth)
Date: April 30, 1958
Creator: Arndt, R. J. & Terrell, C. W.
Partner: UNT Libraries Government Documents Department

MAGNETIC PROPERTIES OF INSULATORS. Quarterly Report No. 1, Covering Period February 15, 1961 to May 15, 1961

Description: The magnetic properties of color centers were studied to obtain information regarding electron traps in insulators. Experiments designed to determine the equation governing the recovery of resonance after saturation were carried out. Relatively large samples were prepared by the method of additive coloration. KCl and RbCl crystals were used. Resonance saturation as a function of concentration was investigated and no significant dependence found. Measurements of the unsaturated susceptibility were made at liquid nitrogen and liquid helium temperatures. The bleaching of the F-center to form the B-band produced a different resonance. The equipment for observing the saturation and recovery of a portion of the resonance at 4 deg K is described. A theoretical examination was made of the interaction between the vibration of the ions around a negative-ion vacancy in an alkali halide and an electron trapped at that site. (M.C.G.)
Date: May 29, 1961
Creator: Markham, J. J.
Partner: UNT Libraries Government Documents Department

MAGNETIC RECORDER FOR NUCLEAR PULSE APPLICATION. Covering Period: August 6, 1959 to October 5, 1959

Description: Direct recording of nuclear pulse height data on magnetic tape is being investigated. The characteristics of various brands of commercial tape are being investigated and a waveform analysis is being performed in an attempt to determine the most favorable frequency range for available tapes. Use of the magnetic modulator head is being investigated to minimize variations due to short term tape speed variations. (W.L.H.)
Date: October 31, 1960
Creator: Burgwald, G. M. & Stone, C. A.
Partner: UNT Libraries Government Documents Department