Objective was to determine the effects of long-term exposure to elevated temperatures on the strength and elastic properties of concrete mixes used in Hanford radioactive waste storage tanks. The report contains data from tests conducted on two Hanford concrete mixes to determine the modulus of elasticity, Poisson's Ratio, compressive strength, and splitting tensile strength at room temperature and elevated temperatures. All tests were made on 6-in. dia. by 12-in. long cylinders. Modulus of Elasticity and Poisson's Ratio were determined by sonic (dynamic) and static test methods. Variables were temperature, length of exposure to elevated temperatures, and curing time prior to exposure to elevated temperatures. 16 fig. (DLC)

A wide variety of isotope target preparative methods have been used, including rolling of metals, vapor deposition, electrodeposition, chemical vapor deposition, and sputtering, to obtain thin and thick films of most elements or compounds of elements in the Periodic Table. Most thin films prepared for use in self-supported form as well as those deposited on substrates require thickness measurement (atom count and distribution) and/or thickness uniformity determination before being used in nuclear research. Preparative methods are described together with thickness and uniformity determination procedures applicable to samples being prepared (in situ) and to completed samples. Only nondestructive methods are considered applicable to target samples prepared by the ORNL Solid State Division, Isotope Research Materials Laboratory. Thickness or areal density measurements of sufficient sophistication to yield errors of less than +-1 percent have been achieved with regularity. A statistical analysis procedure is applied which avoids error caused by balance zero-point drift in direct weight measurement methods. (auth)

A field study was initiated in the fall of 1974 at the United States Energy Research and Development Administration's Savannah River Plant near Aiken, South Carolina, to determine the spatial and temporal variation of plutonium in soil-plant systems, with wheat as the crop of interest. The study was conducted on a field adjacent to a nuclear fuel reprocessing plant. Soil in this field was lightly contaminated with plutonium originating from atmospheric releases by the reprocessing plant during its 20 years of operation and from global fallout. The plant releases provided a true industrial source of plutonium for study purposes. (auth)

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A short review is given of some of the important dates in the experimental fusion program at Livermore. A few of the parameters of the laser systems which are being used for these experiments are mentioned. Some information about specialized diagnostics which have been developed at the Livermore Laboratory for these experiments is described. The focusing arrangements for each of the systems are discussed. Experiments both on planar targets and on targets for laser fusion are described. (auth)

Using the time-of-flight technique, energy distribution measurements were made of the fusion produced $alpha$ particles emitted from laser implosions of DT gas contained in glass microshells. The number of nuclear reactions was determined by an absolute measurement of both the number of $alpha$ particles and the number of neutrons. From the FWHM of the $alpha$ particle energy distributions, upper limits of the plasmas ion temperature have been inferred. By applying corrections for the broadening of the distribution due to the fuel and the pusher, ion temperatures of 2-3 keV have been calculated. These measurements constitute significant evidence that the implosions produced thermonuclear burn of the DT fuel. (auth)

Thermal stress analysis for the EBR-2 reactor intermediate heat exchanger is presented. The sodium inlet and outlet temperatures are determined from a reactor thermal analysis. The effects of thermal transients on the structural integrity of the heat exchanger are evaluated. Inelastic strain evaluation and creep-fatigue evaluation are described. 14 references. (DCC)

A self-contained instrument for the determination of bone mineral content by photon absorptometry is described. A high-resolution detection system allows measurements to be made at up to 16 photon energies. Control and arithmetic functions are performed by a microprocessor. Analysis capability and limitations are discussed. (auth)

A summary of a comprehensive analysis of theoretical and practical aspects of position sensing by charge division from resistive electrodes is presented. Properties of transformer decoupling of the resistive electrode from detector bias voltage are analyzed and compared to the usual capacitive decoupling methods. Optimization and limitiation of signal shaping is discussed as a function of diffusion time constant, signal rise times, and notes. (auth)

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An investigation was made of a series of binary americium alloys with AB$sub 2$ stoichiometry (B = Al, Co, Fe, Rh and Ru) prepared from the $sup 243$Am isotope. The C-15 (MgCu$sub 2$-type) structure appears in AmAl$sub 2$, AmCo$sub 2$, AmFe$sub 2$, and AmRh$sub 2$, whereas AmRu$sub 2$ is isostructural with AmOs$sub 2$ which has the C-14 (MgZn$sub 2$-type) structure. The magnetic properties of the cubic americium laves phases were studied by means of magnetization and nuclear gamna-ray resonance (Moessbauer effect) measurements between 2.5 and 300$sup 0$K. All the cubic Laves phases studied, except AmFe$sub 2$, exhibit almost temperature-independent paramagnetism. The AmFe$sub 2$ sample is ferromagnetic with an estimated Curie temperature of approximately 400$sup 0$K. The hyperfine field at the Am site in all the compounds is small. The bulk magnetic moment of AmFe$sub 2$ (approximately 3 $mu$/sub B//F.U.) is thus associated only with the Fe atoms. The magnetic properties of the compounds are consistent with the assumption that the Am ion is in the +3 state (5f6). (auth)

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An optimal energy delivery system for the world's largest glass laser system has been designed based on computer modeling and operation of laser hardware. Components of the system have been tested on operating lasers at LLL. The Shiva system is now under construction and will be completed in 1977. The energy supply described here will provide cost-effective, reliable power and facilitate the gathering of data in pursuit of controlled thermonuclear reactions. (auth)

High-rate dc supported-discharge sputtering techniques were developed and used to prepare 0.1 mm to 5.0 mm-thick deposits of a variety of metastable materials including amorphous alloys representing more than 15 different rare- earth-transition metal systems and a wide range of compositions and deposition conditions. The ability to prepare thick, homogeneous deposits has made it possible for the first time to investigate the structure, properties, and annealing behavior of these unique sputtered alloys using neutron diffraction, ultrasonic, and other experimental techniques that are difficult or impractical for thin films. More importantly, these characterization studies show that the structure and properties of the massive sputter deposits are independent of thickness and can be reproduced from deposit to deposit. Other advantages and applications of this metastable materials preparation technique include the possibility of varying structure and properties by control of the deposition parameters and the ability to deposit even reactive alloys with a very low impurity content. (auth)

Supported-discharge cathodic etching and SEM examination techniques were developed for $alpha$-Pu and used to investigate the $alpha$ microstructures formed by the $beta$/sub $alpha$/ $Yields$ $alpha$ and $beta$/sub $gamma$/ $Yields$ $alpha$ transformations in high-purity extruded Pu at low and high $alpha$-phase temperatures ($beta$/sub $alpha$/ and $beta$/sub $gamma$/ are $beta$ formed from $alpha$ and $gamma$, respectively). Low (200$sup 0$K) $beta$/ sub $alpha$/ $Yields$ $alpha$ transformation temperatures produced $alpha$ with a grain size that was finer than that of the original extruded $alpha$ and substantially smaller than the grain size of the $alpha$ formed from $beta$/sub $gamma$/. At high $alpha$-phase temperatures (343 to 370$sup 0$K), $beta$/sub $alpha$/ transformed to $alpha$ by the surface nucleation and inward growth of colonies of columnar $alpha$ grains oriented radially with respect to the original nucleation site. The transformation kinetics could be correlated with the microstructural observations based on a correspondence between the long axes of the grains and the (010) direction of the monoclinic $alpha$-Pu structure. Significant changes in the size, shape, and orientation of the $alpha$ grains were noted with increasing transformation temperature. Conversely, the grain size of the $alpha$ formed from $beta$/sub $gamma$/ was essentially constant at all transformation temperatures. Metallographic evidence of the $gamma$ …

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A brief review of materials problems for toroidal theta pinches and tokamak devices is given. A collection of material data taken from five conceptual design studies is presented. (MOW)

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The cross sections are measured for K$sup -$p $Yields$ anti K$sup 0$n at 520 to 1060 MeV/c and for anti pp $Yields$ anti nn from 270 to 960 MeV/c with a typical point-to-point precision of about 1 percent. The cross sections in preliminary form are shown and discussed. It is suggested that the spin of the $Sigma$(1590) must be at least $sup 2$/$sub 3$ and that of a possible resonance at the bump at 475 MeV/c must be at least 4. (JFP)

Recent research involving the direct computer simulation of plastic deformation through planar dislocation glide suggests that plastic inhomogeneities such as the formation and growth of discrete slip bands are an inherent feature of deformation through glide. The sources of glide inhomogeneity are described and the influence of temperature, microstructural barriers, and applied stress on the heterogeneity of deformation in idealized crystals is discussed.

A negative sputter-type ion source of the Mueller-Hortig geometry is described which utilizes a positive surface ionization source. Among the ion beams which have been produced are: Al-0.2 $mu$A; All0$sup -$-3 $mu$A; Au$sup -$- 6 $mu$A; C$sup -$-25 $mu$A; C$sub 2$$sup -$-20$mu$A; Cl$sup -$-100 $mu$A; Cu$sup - $-0.5 $mu$A; CuO$sup -$-0.8 $mu$A; F$sup -$-40 $mu$A; I$sup -$-26 $mu$A; 0$sup -$- 30 $mu$A; Pt$sup -$-3 $mu$A; S$sup -$-44 $mu$A; TaO$sub 2$$sup -$-2 $mu$A. The yields of Cl$sup -$, F$sup -$, O$sup -$, and S$sup -$ produced from gaseous or high vapor pressure compounds are observed to be sensitively dependent on the metallic surface from which they are generated, indicating an intermediate surface chemical effect. While the source produces very intense beams of the halogens, sulfur, and oxygen and relatively intense beams of the metallic oxides, there appears to be a need for additional surface cesium to ensure maximum negative ion yields from many of the elemental materials. (auth)