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The Determination Thorium Isotopic Ratios by Radiochemical Methods

Description: >A sensitive analytical method was needed to determine the total thorium content and the Th/sup 2//sup 3//sup 0/ isotopic abundance in a number of uranium ore and mill talling samples available in the United States. A procedure was developed using absolute alpha counting to determine Th/sup 2//sup 3//sup 0/ and neutron activation analysis to determine Th/sup 2//sup 3//sup 2/. The method is highly specific with a sensitivity on the order of 10/sup -//sup 1//sup 0/ grams for either isotope and wa… more
Date: January 1, 1960
Creator: Matsumoto, W. Y.
Partner: UNT Libraries Government Documents Department
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Some X-Ray and Fast Neutron Response Characteristics of Silver Metaphosphate Glass Dosimeters

Description: A study was conducted to determine the adequacy of silver metaphosphate glass as a dosimeter for gamma radiation coexistent with fast neutrons. The fast-neutron response in the energy region encompassing a major pcrtion of the fission spectrum was determined and a method of decreasing the photon-energy dependence was developed. The size of the dosimeter and reprcducibility of results make this system a useful addition to gamma -ray dosimetry. particularly for gamma rays coexistent with neutrons… more
Date: September 1, 1960
Creator: Thornton, W. T. & Auxier, J. A.
Partner: UNT Libraries Government Documents Department
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USE OF SILICON SURFACE-BARRIER COUNTERS IN FAST-NEUTRON DETECTION AND SPECTROSCOPY

Description: A neutron-sensitive semiconductor counter was constructed by depositing a thin layer of Li/sup 6/F between two silicon surface-barrier counters. Neutrons are detected by observing the alpha + T pair resulting from the Li/sup 6/(n, alpha )T reaction; pulses from the two counters are added, and the sum pulse is amplified and recorded on a multichannel analyzer. Since the sandwich geometry permits simultaneous detection of both reaction products, the magnitude of the resulting sum pulse is proport… more
Date: May 31, 1960
Creator: Love, T A & Murray, R B
Partner: UNT Libraries Government Documents Department
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Periodic Calibration of Temperature Sensing Elements. Core 1, Seed 1. Test Results T-641303

Description: A test was made to determine the direction and magnitude of any drift in the temperature-sensing elements and the receiver-indicating units for the reactor coolknt loop and pressurizer resistance thermometers. A test was also made to determine the difference between the measured value of the neutron flux with the reactor shut down, as determined by BF/sub 3/ counters, and the neutron flux due to the Po-Be source. (W.L.H.)
Date: May 29, 1960
Partner: UNT Libraries Government Documents Department
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Study of Real Gas and Heat Transfer Effects on the Design of Hotshot Wind Tunnels

Description: A study of heat transfer in the art chamber and converging section of the nozzle of a "hotshot" wind tunnel was conducted to determine the effects of heat transfer on the performance of this type of wind tunnel at initial are- chamber pressures from 100 to 6800 atm and temperatures from 4000 to 14,000 deg K. Radiation from the hot gas was found to be governed by black-body emission laws for pressures above 100 atm at the temperatures considered. Convection to the throat was evaluated, and it wa… more
Date: March 1, 1960
Creator: Stalder, J. R.; Rubesin, M. W. & Eberly, D. K.
Partner: UNT Libraries Government Documents Department
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MAGNETIC RECORDER FOR NUCLEAR PULSE APPLICATION. Period covered: December 6, 1959 to February 5, 1960

Description: An evaluation of a modulator flux sensitive playback head to be used with an analog magnetic recorder for nuclear pulse information storage was made. The modulator head was found unsultable. A pulse stretching unit was constructed which takes pulses from a standard linear pulse amplifier and provides an output signal suitable for driving a recording head. (For preceding period see ARF-1151- 3.) (C.J.G.)
Date: February 24, 1960
Creator: Burgwald, G.M. & Norton, R.M.
Partner: UNT Libraries Government Documents Department
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Development of a Fuel-Element Leak-Detection System Based on the Principle of Isotopic Exchange

Description: The selective removal of halide fission products from an aqueous solution by exchange with the halide in a solid silver halide was studied as the basis for a fuel-element leak detector. The retention of fission-product halides on a silver halide column was investigated as a function of coolant flow rate, halide anion, and column size. Fission prcduct decontamination factors and predicted operating lifetimes were obtained for a number of reactor operating conditions. It is concluded that a sensi… more
Date: August 1, 1960
Creator: Howes, J. E., Jr.; Elleman, T. S. & Sunderman, D. N.
Partner: UNT Libraries Government Documents Department
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Effective Cadmium Cutoff Energies

Description: Effective cutoff energies for point l/v absorbers inside of spherical and cylindrical cadmium filters have been calculated for thermal reactor neutrons. The neutron spectrum was assumed to consist of a Maxwellian plus a 1/E component, and the parameters varied were the thickness of filter, the Maxwellian temperature and the Maxwellian to 1/E flux ratio. Because of the sensitivity of the effective cutoff to Maxwellian flux parameters for thin filters it is recommended that filter thicknesses of … more
Date: March 11, 1960
Creator: Stoughton, R.W.; Halperin, J. & Lietzke, M.P.
Partner: UNT Libraries Government Documents Department
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Experimental and Research Work in Neutron Dosimetry. Final Summary Report for the Period May 15, 1959-June 15, 1960

Description: A practical, prototype silicon p-n junction fast-neutron dosimeter, sensitive in the same range as human tissue, was developed, together with sn associated read-out circuit to facilitate the accurate measurement of accumulated dose. From both theoretical and experimental considerations, it was demonstrated that the dosimeter is essentially insensitive to the gamma and thermal components of a uranium fission spectrum. It was shown that accumulated damage effects appear to be environmentally stab… more
Date: June 15, 1960
Creator: Gorton, H. C.; Mengali, O. J.; Zacaroli, A. R.; Crooks, R. K.; Swartz, J. M. & Peet, C. S.
Partner: UNT Libraries Government Documents Department
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Magnetic Recorder for Nuclear Pulse Application. Final Report Covering Period: June 5, 1959 to June 5, 1960

Description: An analog recording technique was investigated in which pulses from a scintillation counter are stretched to a width compatible with the bandwidth of the recorder. Three types of playback systems were considered, i.e., unequalized velocity, equalized velocity, and flux sensitive playback. The results of the three systems were found to be comparable. Loss in resolution in the process was primarily due to nonuniformities in magnetic tape properties and maintenance of an adequate head to tape cont… more
Date: June 27, 1960
Creator: Burgwald, G.M. & Stone, C.A.
Partner: UNT Libraries Government Documents Department
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ILLUMINATION OF 80$sub 4$ CHAMBER

Description: An estimate is made of the illumination required for the 80-in. bubble chamber, based on the absolute sensitivity of the film. The required intensity is estimated to be 23.4 tube is calculated to be 145 cm/sup 2/. The results are compared with these obtained from 72- and 20-inch chambers. (D.L.C.)
Date: September 29, 1960
Creator: Anderson, F.
Partner: UNT Libraries Government Documents Department
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Radioisotope and Radiation Applications. Quarterly Progress Report

Description: A series of experiments was completed using the process model for studying radiotracer control of iron removal from a nickel-refinery stream. The results of 13 experimental runs indicated that the radiotracer control concept is technically sound. The iron reduction ratios obtained by radioassay agreed well with the iron reduction ratios given by chemical analysis. The radioactivity monitor on the filtrate stream provided a rapid and sensitive indication of changes in process operating condition… more
Date: October 31, 1960
Creator: Sunderman, D. N.
Partner: UNT Libraries Government Documents Department
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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… more
Date: March 28, 1960
Creator: Burgwald, G.M.
Partner: UNT Libraries Government Documents Department
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Measurement of Electron Attachment in Oxygen-Methane and Oxygen-Carbon Dioxide Mixtures

Description: The formation of heavy negative ions by the attachment of low-energy electrons to oxygen molecules was studied for small amounts of oxygen mixed with methane or carbon dioxide. The rate of attachment in both cases was found to depend on the electron energy, the pressure of the oxygen and the non-attaching gas, and on the kind of non-attaching gas. In general, the attachment increases as electron enprgy decreases or as either oxygen or total pressure increases. The value of the attachment coeffi… more
Date: January 25, 1960
Creator: O'Kelly, L. B.; Hurst, G. S. & Bortner, T. E.
Partner: UNT Libraries Government Documents Department
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SNAP I POWER CONVERSION SYSTEM CONTROL DEVELOPMENT. Period covered: February 1, 1957 to June 30, 1959

Description: Development of the control elements for the SNAP 1 power conversion system is described. A description of test and prototype hardware and performance data are included. The control package in its final design is a combination of regulator and speed-sensitive feedback which provides satisfactory steady-state operation and serves as a mechanism correction for system disturbances. (J.R.D.)
Date: June 20, 1960
Creator: Dauterman, W. E.; Mueller, M. W. & Viton, E. J.
Partner: UNT Libraries Government Documents Department
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Progress Relating to Civilian Applications During February 1960

Description: Preliminary results from electrical studies indicate that the "valence- compensated", air-fired U/sub 3/O/sub 8/-La/sub 2/O/sub 3/ solid solutions containing greater than equimolar amounts of La/sub 2/O/sub 3/ are poor conductors. Progress is reported on work devoted to fabrication and evaluation of U/sub 3/O/sub 8/ solid solutions contairing 40. 50 and 60 mole% La/sub 2/O/ sub 3/. and a sample containing 25 mole% Y/sub 2/O/sub 3/ and MgO each. In an investigation on the effects of combined ult… more
Date: March 1, 1960
Creator: Dayton, R. W. & Tipton, C. R., Jr.
Partner: UNT Libraries Government Documents Department
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Radiometric Methods for the Determination of Magnesium and Calcium in Portland Cement

Description: Radiometric methods of analysis for magnesium and calcium have been developed as part of a program for the U. S. Atomic Energy Commission. Office of Isotopes Development, which are applicable to the determination of these elements in portland cement Both methods employ, as a precipitant, a standard solution of (NH/sub 4/)/sub 2/HPO/sub 4/ labeled with phosphorus-32. In the presence of NH/ sub 4/OH, this reagent precipitate; MgNH/sub 4/PO/sub 4/ or Ca/sub 3/(PO/sub 4/)/ sub 2/ from a solution of… more
Date: February 18, 1960
Creator: Brown, C. T.; Howes, J. E., Jr.; Elleman, T. S.; Townley, C. W. & Sunderman, D.N.
Partner: UNT Libraries Government Documents Department
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