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Trace quantities of thorium in uranium were separated by precipitating thorium fluoride from a 1.0M HF-1.0M NH/sub 4/F matrix using yttrium as an internal standard and lanthanum as a carrier. The thorium precipitate was collected on a filter and analyzed by x-ray emission spectrometry. The method has a detection limit of about 15 mu g thorium per gram of uranium. The relative accuracy and precision at the 120- mu g thorium level was 95.5 plus or minus 1.5%. Studies on the rate of precipitation, sample size limitations, and the effect of varying molar fluoride-touranium ratios are discussed. The effects of potentially interfering anions, cations, and acids, which are commonly found in uranium system or form insoluble fluorides were studied. Radioactive tracer studies using /sup 234/Thh and /sup 88/Y were carried out at different levels of thorium and uranium to determine the absolute efficiency of the precipitation. The speed, selectivity, and precision of this x-ray method make it an excellent alternative to spectrophotometric methods. (auth)

From chemical spectroscopy and photochemistry in the vacuum ultraviolet conference; Valmorin, Quebec, Canada (5 Aug 1973). The discussion of photoionization and fragmentation of polyatomic molecules covers experimental procedures, energy deposition, dissociation processes and the determination of thermochemical quantities, and diatomic and small and large polyatomic molecules. (JFP)

Laminated flat cables using Kapton film were fabricated; these cables withstood temperatures up to 1000 deg F (538 deg C) for 10 minutes and potentials as high as 20 to 30 kV dc. A superior polyimide adhesive, Thermostik-D', was originated in the Bendix Polymer Laboratory, and a moldable polyimide powder and a process for using it were developed. These materials exhibit electrical strengths up to 625 volts/mil (24 kV/mm) and temperature resistance as high as 850 deg F (454.4 deg C). (auth)

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The gaseous oxidation of uranium and its alloys is a complex process. Material transport across the oxide scale occurs predominately by anion diffusion, leading to the development of large stresses in the oxide. The thermodynamic stability of UO/sub 2/ is such that the oxygen potential in a compact layer of UO/sub 2/ is so low that many constituents of uranium alloys remain unoxidized and are found embedded in the UO/sub 2/ scale. The high- temperature oxidation properties of uranium and its alloys are reviewed in light of the above parameters. Materials covered include binary alloys of uranium with Nb, Zr, Mo, V, Ti, Al, and Cu as well as the ternary system U--Nb--Zr and other more complex formulations. Details of oxygen diffusion in UO/sub 2/ are discussed. Evidence is given for stress generation during oxidation, and mechanisms for stress generation and relief are described. (25 figures, 52 references) (auth)

This report presents the flight test results for a reentry vehicle spin-fin roll control system. The test vehicle, designated the Roll Control Resonance Test Vehicle, was flight tested on May 10, 1972, at the Sandia Laboratories Tonopah Test Range. The purpose of the flight were (1) to demonstrate and evaluate the capability of the control system to overcome a roll resonance flight instability and (2) to confirm the analytic predictions of system performance. The flight test vehicle had built-in asymmetries which, without roll control, would have caused a persistent roll resonance instability to occur. The test was successful in that all systems functioned properly and all program and flight test objectives were accomplished. Flight test data presented herein confirm analytic predictions and flight simulation methods. Results show that the system maintained roll rate control and prevented the roll resonance instability.

Methods used to obtain evaluated neutron interaction and photon production data for /sup 238/U are described. (auth)

This report outlines the effects of "social indicators", data series on the condition of society intended to describe and measure social changes in public programs, government decisions and national goals.

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For Atlantic Richfield Hanford Co., Richland, Wash. Research being conducted under the Radionuclides in Soils Program is attempting to predict the distribution and movement of liquid wastes in the heterogeneous subsurface environment of the Hanford Reservation. As part of this program, a transport model is being developed to predict chemical phenomena in soil-waste reactions. This document describes the use of the PERCOL model, which was developed as a simplified one-dimensional precursor to the transport model. PERCOL numerically describes the complex chemical reactions which occur during percolation of a waste solution through a porous media. This User's Manual describes the main program (PERCOL) and two subroutines MEWTIT and DIST) and gives procedures for accessing these programs, inputting data to them and interpreting the output. (auth)

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The vapor pressure of potassium was experimentally determined from 2100 deg F up to-its critical temperature. An empirical equation of the form ln P = A + B/T + C ln T + DT/sup 1.5/ was found to best fit the data. A critical pressure of 2378.2 plus or minus 4.0 psia (161.79 plus or minus 0.27 ata) was measured. The corresponding critical temperature, extrapolated from the pressure-- temperature curve, is 4105.4 plus or minus 5 deg R (2280.8 plus or minus 3 deg K). The technique employed was tae pressure tube method developed earlier in this laboratory and used for determining the vapor pressure of rubidium and cesium. This method measures tae critical pressure directly, as well as the vapor pressure st lower temperatures. (4 tables, 6 figures, 26 references) (auth)

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